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K6JRF's Page formerly W6FZC My Mercedes Benz S500 Coupe |
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(Updated: Jan 8, 2021)
What's New . . .
- Hydraulic Suspension System Leak and Repair . . . click here
- 2020 Smog Test Results for Merc and Honda . . . click here
- Parts for Hirschmann Auta Antennas . . . click here
- Battery Tester Ancel BA-101 Testing . . . click here
- Auxiliary Fans Cut-in Modification Update . . . click here
- HomeBrew DTC Tester updated . . . click here
Cool Harness Info . . . click here
[6/6/19] DTC#19 Eprom Info . . . click here
Performance Chip Info . . . click here
W140 Electrical Troubleshooting Manual . . . click here Diagnostic Trouble Code Manual . . . click here
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I no longer recommend EM for your Mercedes repair. The management has broken confidence with me by their attitude and actions. When the business first opened (20+ yrs ago), it was a excellent repair shop where its ONLY tech could repair ANY Mercedes no matter what! Other MB shops sent their "couldn't fix" cars to his shop. Sadly, he died in a tragic motorcycle accident and the shop went into turmoil. The silent-owner took over, hired MB techs and has enlarged their floor plan but I believe it was too much, too soon. For 15+ yrs, I supported EM in every way I could . . bought a Mercedes from EM . . had service done there . . recommended EM for email I received . . sent people to EM and some bought cars based on my recommendation . . made many posts in Mercedes forums . . posted technical pages based on ideas learned from some EM techs . . absorbed all costs to keep an Internet presence for EM. Click here to see one of the pages posted in 2009. 
In return, I could buy MB parts for my Cool Harness at cost + 10%. That's what it started out but as time
went by, the EM profit margin rose to 25.5%. Not bad . . to make 25.5% profit from a few
key strokes on a computer. Check out the actual LAST bill showing the "cost" and "my price" . . numbers don't lie!!
Some data has been blacked out . . Recently that support (as bad as it was!!) has abruptly ended. The agreements have been broken w/o giving me a valid explanation. Not a good way to treat a loyal friend and customer IMO. In addition, I was personally admonished for attempting buy some parts w/o prior approval from the owner. Of course, this was the way it was done previously. When asked why the change . . the owner said ". . I don't have time for this nonsense"! The other day, I was there from morning to mid-day, the phone didn't ring for service appointments and there wasn't even one 'drive-in'! Maybe others have noticed their change in attitude?? So, sadly after 20+ years, I can't, in good conscience, recommend their services for your MB. It will take some time to find another shop(s) and when I do, it will be posted here. |
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Welcome to my Mercedes S500 Coupe auto page. The info here will assist you in troubleshooting the electrical
systems. |
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- 20 Yrs of Smog Test Results: 2000 to 2020 -
The tables below summarize the results the 2000 to 2020 California smog tests for both cars: Mercedes S500 and Honda
Accord LX. I decided to keep the test results and post them so as to serve as an easy way to instantly see trends. The table
The car has consistently passed with flying colors and has done well over the years. The catalytic converter is original as is the "plumbing". Prior to the 2006 smog test, the O2 sensor, MAF sensor were replaced. And I decided that the use of K&N Air Filter was too much hassle, so I went to a standard paper filter. [Click here to see the contamination from K&N filter]. Mercedes Lambda Calculation 
The summary results of the CA Smog tests for my Mercedes were entered from the summary sheet into the program
* to graphically show how the car's smog system is performing. After entering the numbers
for "25MPH" from the 2020 smog results, you see that Lambda = 0.999 meaning that the Air/Fuel (A/F) ratio 14.69 making
the fuel mixture RICH by 0.1% Couldn't ask for better than that! It's interesting to note that the readings have improved since then, especially the HC at highway speed. The pre 2004 results are much higher than the 2006 thru 2012 results although the 2020 test results are close to the 2000 results. I periodically clean the MAF sensor. As you see, the results have stabilized possibly due to the use of Seafoam . . which is ALWAYS added at fillup. Been doing this for 20 years! Due to the full-time ASR, which is not defeatable, the NOX tests are not performed on the 'treadmill' b/c of the ASR control which causes the car to literally stop . . . Ask me how I know?? |
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Similar to my Mercedes, I've kept the Smog Test results for my '90 Honda Accord LX. . . a car that is 30 years old! In 2012,
many of the original smog accessories were replaced prior to the 2012 smog tests. As you can see, the 2010 results were very shaky.
In 2012, a "pre-test" was done to see how bad it is and it was bad! Although it did pass, it was just under the NOx and HC limits.
Honda 1990 Accord LX
In 2012, the Honda's smog components were in bad condition as most were original parts . . . with 148000 miles! The PCV long since ceased to perform and was now a "bilateral" valve. The air-filter was plugged solid and finally, the EGR valve was badly carboned. In addition, the O2 sensor was also original as was the catalytic converter. Note the readings were progressively getting worse with the years so in 2012, all major smog elements were replaced. After two (2) years, the results are still exceptional as shown in the chart. The Nox at 25MPH was only 10 ppm [limit = 530]! So the $500 investment (including labor) to replace the 02 sensor, catalytic converter, PCV valve, air filter and spark plugs has shown to be a good investment. All in all, the CA smog Test results for 2018 show it to be quite good except that the CO is higher than previous years, so possibly the O2 sensor needs to be replaced before the next smog check in 2020. Honda Lambda Calculation 
The results of the CA Smog tests for my Honda were entered from the CA Smog summary sheet into the program
*. After entering the numbers for "25MPH" from the 2020 smog results, you see that Lambda =
0.983 meaning that the Air/Fuel (A/F) ratio 14.45 making the fuel mixture RICH by 1.7%! The CO% and NOX readings have increased; the CO at 25mph = 0.61% which is JUST UNDER the limit of 0.69%!! The NOX reading has 'step-function' climbed from two-digits to three-digits. Although still below the limit (apx 530 ppm), it's an area of concern. The higher CO (0.61%) reading indicates a rich mixture which points to incomplete combustion. Some causes are: 1) Air Filter - A dirty air filter will absolutely restrict air flow, thus disturbing the proper 14.7:1 air/fuel ratio required for optimum fuel combustion: Upon inspection, the 8 yrs old filter was very dirty so it was replaced. 2) Spark Plugs - Worn spark plugs have higher gaps that produce less 'spark' energy so they s/b replaced regularly: pulled all plugs:#2,#3,#4 plug gap in excess of 0.055"; #1 had a stalagmite growing on the ground electrode; all were 8 yrs old! Replaced all plugs w/ NGK (7098) ZFR5FGP spark plugs. 3) PCV Valve - A plugged or open PCV valve doesn't allow for gases to be mixed back into the throttle assembly. It was plugged with "gunk", so it was replaced with a new one: PCV1146DL. 4) EGR Valve - it recirculates metered quantities of exhaust gas into the engine intake system for increased engine efficiency, reduced fuel consumption and lower NOx emissions. It's easy for the EGR valve to become plugged or passage way reduced. Used some carbon solvent and let the valve sit in the solution for apx 3 hours. Some scraping and a little compressed air returned it to as good as new! 5) IAC Valve - this valve can cause surging at idle; the car's idle speed goes to apx 1800rpm then abruptly drops to 1100 rpms. This indicates that it is 'plugged'. Cleaning it usually fixes the problem . . . if not, it needs to be replaced. Inspection shows it was somewhat dirty but the gasket was crumbling due to age! Clean it, replaced the gasket and it seems to be working properly now. At KM A&H [858.268.3400] , the idle screw on the throttle body was adjusted to lower the idle to apx 800 rpm when car is fully warmed. 6) O2 Sensor - The O2 is responsible for delivering information to the Engine Control Unit) relating to the oxygen content in the exhaust stream after it has left the combustion chambers. The ECU will determine how much fuel to inject into the combustion chambers based on this data. The more oxygen in the stream, the more fuel the computer will deliver, and vice-versa. The CRACKED head that existed (2017 to 2020) probably contaminated the O2 sensor and a failing O2 sensor will cause increased carbon monoxide emissions. Also most manufacturers recommend replacement at 50 to 60K miles which was easily put on the car in 8+ yrs of driving! Replaced with a new NGK model. 7) Throttle Position Sensor (TPS) - The TPS relays information regarding the position of the air intake system's throttle plate. Most often a faulty TPS will cause high CO, as an engine's ECU always prefers to send more fuel rather then less, in an effort to avoid a lean fuel mixture and subsequently higher engine temperatures: After making all of the above described changed, the TPS was NOT checked b/c engine operated w/o any "TPS" induced problems. It may be checked in the future: and adjusted if need be. Grn=Neg; Yel=5V; Red=TPS voltage; reset=0.5V; full=4.5V 8) Engine Coolant Temperature Sensor (ECT)- Low engine temperature requires more fuel. When the ECU is unable to determine what the engine's accurate temperature is, it will not adjust fuel delivery properly; resulting in high CO. As you've read, the Engine Computer prefers to send more fuel rather then less to avoid a lean fuel mixture. Will replace it if the upcoming pre-smog test is not to my expectations. The plan is to drive the car for at least two (2) months and then have a pre-SMOG TEST run. Will post the results here. * If you want to translate your smog parameters into Air-Fuel-Ratio (AFR), then download the Lambda Calculator Pro program to see how well your vehicle is "tuned". It's a very simple and straightforward program to install and use. |
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Air - Fuel Ratio Variations
One of the best 'visual' charts I've ever seen is the one shown here. It clearly shows the effects of air and fuel ratios on the amount of
NOx, CO2, CO and HC generated.It also shows how "good" your catalytic converter MUST be to remove and reduce the amounts of pollutants to acceptable levels that allow the car to pass California smog tests. The RED hash marks show the current CA Smog test limits. Running the mixture with Lambda = 12.5 gives the best power and lower engine heat but raises the level of the main pollutants, HC and CO but lowered NOx levels. You can see that there isn't an "ideal" setting for Lambda to get the lowest value for ALL pollutants. The best compromise is the Lambda setting at 14.7. The lowest amounts of HC, CO are produced but higher NOx levels. However, these limits MUST be reduced almost an order of magnitude to meet current CA smog test limits. A tough job for your catalytic converter. A good discussion of the AIR FUEL RATIOS is here. |
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Test Only Smog Stations As you may know, all older cars MUST be tested by a "STAR test-only" smog center. After searching and interviewing the owners, I chose to use A&P Smog located at 7835 Armour St, telephone 858-560-8874. The YELP site shows some picture details of the site here. The owner, Chris was a Lexus/Toyota tech for 28 years and knows the emission systems for all cars. The A&P webpage is here. You can email them at  The state of California wants to remove older cars, so the smog "checkover" is very detailed. They have forbid car warmup period. So now they want the tech to start the car, idle it for 2 minutes and go into the smog test. If the car was parked and shut off (as is the norm), the cat will be cold meaning that it could fail smog testing. Best to keep the car idling to ensure that the cat is hot. It should be obvious that they want to remove the older cars from operation so you should make sure that the car is thoroughly warmed and has been taken on the freeway to fully heat the catalytic converter. A word to the wise! Starting in Jan 2013, all 2000 or newer cars have be tested using their ON-BOARD systems; no interconnection to the smog stations equipment. Today (2014), I found out that the new-cars (2011 and later) test ok but that early cars have problems passing b/c of "glitches" in the test system and CA state software. |
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Auxiliary Fan Modification for All Mercedes
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The Cool Harness-V2(c) fills the void for the late model Mercedes owner who wanted a Cool Harness. Now it's here after long last! All of the comments for the original version Cool Harness apply to this version. The Cool Harness-V2 temperature cut-in point has been set to 94 deg C. So only ONE (1) version of the CH-V2 is needed. The CH-V2 has two (2) separate sensors within the package. Mercedes changed to this combo sensor starting with '95 model year cars (and earlier for some other models). It combines the original CTS (B10/8) and ECT (B11/2) sensors into one housing. In the CH-V2, the ECT sensor is 'stock'. Also the modification to the CTS portion does NOT affect the ECT portion. Each sensor operates independently. The CH-V2 is made using a Mercedes-Benz Original Part quaranteeing good-as-new performance along with the Cool Harness benefits. Unfortunately Mercedes parts cost have literally skyrocketed and that means a higher price for the V2 model. Original Cool Harness: The price is $115 plus $10 s/h. S/H charges for USA orders only! Please contact for foreign order shipping. Cool Harness-V2: The price is $125 plus $10 s/h. S/H charges for USA orders only! Please contact for foreign order shipping. Both Cool Harness(c) models come with detailed installation instructions complete with detailed pictures of various MB engines showing the CTS location to assist you to complete the installation. If you can plug-in a toaster, you can install a Cool Harness(c) into your car. For the original CH model, there are currently (2) models that you can select. Personally, I use and recommend the CH-92 model.
* The remarks assume a hot day, 85F or above with 80% RH or higher with the A/C operating.
The higher the CH's cut-in temperature, the less the Aux fan(s) will operate. For example, with the
CH-95, the fan(s) will only operate if the engine temperature attains approximately 95C which
would most likely be during stop/go traffic. During freeway driving, the fan(s) may never operate. This assumes that your
car operates between 82-92C normally, which most Mercedes do. Unsolicited comments from enthusiastic Cool Harness users:
Thanks again. = FMN = |
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You can check before and after in dead traffic. Thanks a lot! Will recommend to my friends. = RM = |
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I replied that he should take his family to dinner since the CH-92 will not materially change the engine cooling. His reply: I will hold off then on purchasing anything further for now. Thanks again for the honesty and for making this device. It certainly works well! = JD = I got [Croatia] the V2 and installed it ['95 S320] and it works perfect, I asked myself why the hell did I not buy it a few years ago! This is perfect Thank You! = BB = Wanted to send a quick thank you – “Cool Harness” [CH-92] arrived today and was beyond easy to install ['94 E320]. I also checked the coolant mix, and as suspected, it was way rich! Between the coolant adjustment, additive (PI) and the Cool Harness, it feels like the car is running as the day I bought it with 77k original miles. The engine temperature never even approached the 100C line and I could verify the fans kicking in much earlier. = CH = Got the CH-92 in on Friday. I think it took me longer to find my keys than to hook it up. I ran the car ['95 S420] Saturday, what a difference!!! It got a bottle of purple ice last night too. Thank you for another great product!!! = MK = Received [Brunei] 2 pieces Cool Harness-V2. Just install one in ['94] C280. It works like magic. The temperature stays around 90 deg C. Thank you. = PCF = I'm impressed. Comes on at 92 [CH-92] and will keep it around 90 with AC in 90+ temps ['94 E500]. Without AC, it brings it down to below 82 where it runs in the winter. Kinda wish it turned off earlier. Am very pleased. Thanks. = WW = Thanks for promptly shipping your cool harness [V2] for my '95 S500 Sedan. I showed this to my master Mercedes tech and he was quite impressed. I installed it ['96 SL500] within 5 minutes over the noon hour and already I can see a dramatic change in the temperature gauge. Thanks again for all of your help. = CG = It works like a charm [CH-92]. In fact better than I thought. My next door neighbor stopped me as I was tooling down the street and I talked to her for 45 minutes while the car ['95 SL500] was running in 92 degree weather. Normally, it would have hit the top of the temp gauge, but this time it stayed at mid range. = AC = Finally, solved temperature problem, it was Temp gauge. Today I replace the sensor with new one (only 14$). Difference between real coolant temp. and temp. gauge is about 5'c. My car is '95 S320. After replace the new temp. gauge sensor with your CH_V2, coolant temp. never exceed 95'c even in hot weather with air conditioner on. Before installing CH_V2 and new temp. gauge sensor, my car's coolant temp. is 100~110C, sometimes over 115C in hot weather. Aux fan's kick in temp. is just bellow the 95'c!!! Thank you so much for your great job and advice. Now, I am so happy that I don't have to worry about engine temp.!!!!!!! Best Regards = HBY = I recently ordered the CH-92 and I just wanted to get back to you on it, and tell you that this Cool Harness is an outstanding buy! I installed it in less than two minutes and from the very next day the car runs extremely cooler. I use to read the temp gauge before at 100 degrees and above, but now it reads just at or above 80 degrees constantly. I recently drove my S-class ['94 S500 coupe] on a road trip from Tampa Bay to Orlando Florida and it was about 98 degrees outside. Living in Florida the daily outdoor temperature is always steamy HOT, but that very day my benz ran a cool 85 degrees the entire trip. Overall, this device works and definitely recommended period. Hats off to you. = PP = I installed the Cool Harness [CH-92] right before I left for Vegas last Wednesday ['93 300TE], and it worked great! Went on to Parker Dam on Friday into 124 degree desert heat, uphill quite a lot, and the peace of mind I had in seeing my temp stay in the 100 degree range was priceless. I'm glad I found you. = MH = Got the Cool Harness [CH-92] a few days after you sent it [Austria!], but hadn’t the chance of testing ['92 300D] it until the last few days, which were warm enough to use air condition. Well, what should I say? It works perfectly! Thanks for the easy transaction and the great product. I will talk to my father - I think he will need one for his S-Class too. ;-) = CEL-H = Got the Cool Harness [V2] today, it works great. I'm running at a cool 94 deg ['95 E320], and it was pretty hot today. Install took less than a minute! = MP = Real nice little product [CH-92], I figured it would help some but didn’t know really how great it is. The other day I’m driving from San Diego to Temecula in 95+ heat, with the A/C going and I noticed when I hit the stop and go traffic the temp gauge stayed well below its normal spot (above the 80 line) and didn’t think much of it, so when I got to Temecula I stopped by the ATM machine in 100+ heat and left the car idling in the parking lot. Well the car’s ['95 E300D] temp gauge didn’t move and when I got out I heard those fans just whirling away and thought yeah, that’s a good little product – thanks! = TH = I received the CH-92 a few weeks ago and installed same day and its working great. As you said, the temp does not go beyond 92C. I ran the car ['92 190E] on idle for over 5 mins and never went over 92C even with the A/C on. Great product and very well build. Thank you again and also you have a great web site on information. = NM = I just wanted to let you that I received my CH-92 last Friday and installed it ['91 300E] the following day and it works great! The temperature gauge stays below 100 degrees at all times......even with A/C on! Thank you for a quality product and outstanding service. = AH = I bought the cool harness CH-92 a few months ago and was discussing with you how it would work. It must have been related to outside ambient temperature (at the time it was 30). Ever since the warmer weather has arrived, It performs flawlessly, ['95 S600] just wanted to say thanks for a great product and a note on the temperature issue. = NR = Just wanted to drop you a not to let you know that I received the harness CH-92 and it is working beautifully in my car. My engine bay ['94 E420] and I would like to thank you for a cooler running car. = AW = I am one happy/cool Benz driver with your brilliant invention – I put it in [CH-92] and drove all day today with the coolest engine ever ['91 300TE]. Wish I knew about this several years ago as it is one of my pet peeves that MB makes the fan wait until the engine is toast before it kicks on – planned obsolescence? Thanks = DF = I received the Cool Harness, [CH-92]. The directions were great. It took all of one minute from the time the hood was up till the time I shut it to install ['93 300SE]. I immediately took it out for a full A/C on hiway drive. Yep, it works, stayed below 98 degrees centigrade the entire time. No more creeping up over 100 degrees C anymore. Thanks for a great product. You ARE the MBZ man! = BS = Just wanted to drop you an note to thank you for your device [CH-92]. It works great. Your installation instructions were accurate and it went right in. When sitting in traffic ['95 S500], the temp goes up to 90 and no higher. It used to make me nervous when the temp gauge would go up to the 100+ mark on the engine temp, now I don't have to worry about it. = SL = Thanks...installed the CH-92 and it works great! Both fans whirling a steady blow through the radiator at the 92 degree mark ['94 E420]. = FA = CH-92 works well. I was afraid of it running the fan most of the time. At least in 70F weather, the thermostat keeps the engine just slightly below the CH-92 [cut-in]. When I slow or stop with the AC on I get the fan SOMETIMES. This keeps the engine temp in a very narrow band which is especially good for the '91 300SL as it has the infamous combination of iron block and aluminum head. I'll pass along the good news to my buddies. = MK = The "Cool Harness" [CH-92] is working GREAT, the car ['90 190E] never heats up beyond the set COOL HARNESS temperature, and I live in Las Vegas where the temperature is already hitting 100 degrees some days! = BV = Wow, what a difference it makes, I live in Los Angeles and its been hot, I just drove in la traffic with AC on, up and down hills, I got it [CH-95] installed in my '94 E420 at Mr MB Motors on Reseda he was awesome. wow! thanks for that!!! = RU = Just received my "Cool Harness", CH-92 in the mail. It is truly amazing. I installed in about 3 minutes with the engine ['92 400E] still hot. Instantly, my overall operating temperature is 20 degrees cooler. I tested it in the San Fernando Valley, where temperatures reach 105F and it worked perfectly. I even left the car idling, with my wife inside, AC on full for 10 minutes and the temperature did not come up. This product is truly incredible. Anyone with a MBZ should use one. = BT = Just got the CH-92, installed it and that thing works great! My '92 400E runs much cooler wish I had know about it sooner. = GO = Received the CH-95 today. Took 30 seconds to install ['92 300TE] and it works perfectly. The fans cut-in just shy of the 100C line on the temp gauge. That is exactly where I wanted it to cut in. Cooled the engine down to where it normally operates at (87C). This is a great idea. I think every one, especially in the South, should use one. It simply keeps the engine from fluctuating up into the high heat zone. Have a good day and I'm going to recommend this to my Mercedes mechanic. = DW = I received CH-92 on Friday, installed it per the very detailed and organized instructions included with package. I drove the vehicle ['94 E420] several times this weekend and the temp stays at worst between the 80-100 marks. You have kept my vehicle running in top condition, I can't thank you enough. Great products, great marketing, great service. . . thanks again. = SS = The cool harness, CH-92 is AWESOME! The temp ['94 S500] has not gone beyond 90C even once. Before this it used to linger between 100-110. THANKS SO MUCH!!! YOU ARE THE MAN!!! = AM = I received the Cool Harness yesterday and installed it immediately ['94 E420]. What a difference it makes. Heat index today in Georgia was between 105 and 110. Drove approx 35 miles this afternoon and temperature ran around 85 on the hwy. Sitting at lights it may have gotten to 100 but dropped down quickly. Thanks again! = BT = You can add me to your list of satisfied customers! I installed the CH-92 in my '92 500E in May and it has kept the car cooler, even in the summer heat of Dallas! If you even need a referral, let me know. I'll be glad to tell your prospective customers. = DH = This CH-92 is great. It fit my '92 600SEL V12 just fine. On the V12s, the 'blue based' temperature sending unit is in the very front of the car, next to the power steering reservoir, under a plastic cover with MB emblem. About 10 min job, and most of that was getting the original connector off. So far it seems to keep temp right at the low to mid 90's 'C on the dash temp gauge. = BM = I installed it right away and just came back from the test drive. Great product indeed, congratulations... It really took me only 3 minutes to install ['93 600SEL] it, including two to find out how to take off the plastic cover on the engine. It's the CH-98, and the fans cut in exactly at the 100C and shut off at 90C. That is exactly what I wanted!! Cheers from a satisfied customer. = MM= Got the cool harness today, its awesome. Works like a charm, engine stays cool. Had a little trouble at first finding the CTS on my '92 500E but after installing, it was awesome! = PE = The Cool Harness is absolutely awesome, it keeps the temp steady around 95 ['92 500E]. I always thought that the engine was like a CPU, keeping it cooler means it runs smoother. Very excited to see that it works as advertised. = GN = I received the CH-92 and installed it today. Works great! The fans kicked on immediately because the car ['95 S500] was hot. = SF = Super neat job on your design: the angled connector end and the shorter wire length is totally stealth. ['89 190E] = FD = Got the part, the direction are very clear and the fan works very well ['94 C280]. Here in South Texas is way to hot for not using this option. It is a quality product you have built it looks very professional and unless anyone knows what to look for I doubt even the MB technician would spot it! Thanks again. = LH = I installed the Cool Harness, CH-92 I got from you and my car ['89 190E] never saw 100C again! Very neat, looks like OEM and it works! = MA = I just wanted to say thank you. I received the part [CH-92] today and installed ['88 300SE] it in less than a minute. Now I can drive with piece of mind despite all the traffic and warm days here in Atlanta. = RB = I got a cool harness, CH-92 from you about a month ago and put it on my '94 C280 here in Tucson, AZ. I think it is a great part and I am sorry I didn’t order it sooner. = MK = The CH-95s both work as advertised. Combined with the lower coolant ratios using WaterWetter in my '89 300TE, I definitely see cooler engine temps. My 420SEL was already running well within the 85-95 range. Whatever the reason, the M103 engine tends to run hotter than my 420SEL. = EA =
To order one or more for your car, click here
'Cool Harness' is copyright© 2000-2018 by K6JRF. |
Get a cooler running Mercedes in 5 minutes! That's how easy it is to install either version of my
Cool Harness(c) into your Mercedes Benz. Simply unplug
the existing harness and install it into the CH(c) and your MB will
reward you with a cooler operating engine.
The Cool Harness-V2 model works with ALL Mercedes from 1995 through 1999 for all four (4) pin
sensors as shown. Mercedes from 1995 thru 1999; C220, C230, C280, E320, E420, E430, S320, SL320, S500/600,
SL500/600, CL500/600 and all others with the four pin sensor. |
Diagnostic Trouble Code #19 Repair Eprom for V8 Mercedes-Benz
This is one of the Diagnostic Trouble Codes (DTC) that is reported by the Diag Module (Menu#6) which states:
Fuel injectors open/short or self-adaptation in LH-SFI control module (N3/1) at limit. This code lights the
Check Engine Lamp (CEL) because it directly affects engine emissions. The "problem" lies in the Fuel Computer Module
and it's not a 'nice' code as you will see! |
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I did finally install the chip onto my '93 400e and the check engine is gone. I passed smog and I wanted to thank you.
I can drive the car another 2 years. Thank you so much!!! = CH =
to send an Email containing;- your full name and address including city, state and zip, - a phone number where I may contact you if needed, - your Email address, - Mercedes MODEL and YEAR info, - PayPal payment preferred. Will take cashiers checks and USPS Money Orders, no foreign MO! DTC_19 Eprom is copyright© 2000-2018 by K6JRF. All rights reserved. |
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The DTC_19 problem can happen in any fuel system. When it occurs, it means you have reached the limit of electronic
adaptation correction. This problem originally started in hot humid climates and it caused the air/fuel mixture to get
richer with great regularity. When the partial adaptation number reaches 0.85, the limit is reached and the CEL cames on!
The upgraded eprom has fixed every instance of the DTC#19 problem, 114 MBs (as of 06/06/19)!
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Mercedes-Benz Diagnostic Trouble Code Manual
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The product is available two ways: Printed Manual: Printed on quality white bond paper and bound with clear cover/dark back page ready for use in your shop or driveway! The Manual is printed double-sided, 160 pages total. The price is $49 + $6.50 s/h (USA orders). Shipped by USPS 'media' rate unless otherwise requested. Please check for availability before ordering. CD-ROM: There are TWO (2) versions: * For all Mercedes owners. This has all DTCs for all models and years. The complete manual or select sections may be printed for your use. The price for this CD version is $39 + $6 s/h. This version is in the universal PDF (portable data format), so all you need Adobe's Acrobat Reader to read/print the DTCs! A current version is furnished on the CD if you don't not have it; simply install it and you're set to read the DTC Manual. E-mail: * Need to find out what those blinking codes mean now? And you have DSL or cable? Then get it via email. The email file is less than 1MB and can be downloaded in a few minutes with even slow speed DSL connection. The price is $29 complete. Can be printed whole or in part. To build a compatible DTC reader, click here The schematic shows how it is constructed. You can build this inexpensive DTC reader from 'junk' box parts. To order your DTC Manual, click here
to send an email containing;- your full name and address including city, state and zip, - a phone number where I may contact you if needed, - your email address, - CD-ROM, PRINTED Manual or E-MAIL. Quantity orders will receive a discount; will reply by Email] - PayPal payment preferred. Will take checks (prefer cashiers), money orders, no credit cards! PayPal is free to use as a buyer. There's no fees and it a very secure and instantaneous way of sending money with zero risk! Click on PAYPAL for complete information.
Diagnostic Trouble Code Manual is copyright© 2000-2018 by K6JRF. |
I've received many requests for a document that summarizes the Mercedes-Benz Diagnostic Trouble Codes (MB_DTC). Well,
it's here! After collating a number of sources, the DTC document is ready to help you properly diagnose your car.
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W140 ETM for Mercedes-Benz
The W140 Electrical Troubleshooting Manual [ETM] on CD-ROM contains 1422 pages and is PDF format. It can be run from
the CD or (preferably) copied to your computer. It runs from all versions of Adobe Acrobat or other compatible viewers.
W140ETM is copyright© 2000-2018 by K6JRF. |
The detailed information is extensive and is organized as follows:
Group 00 - Overall vehicle
Performance Chip for '92-'95 V8 Mercedes-Benz
 PAD chip does not "fix" the DTC#19 code problem.
Get horsepower in 20 minutes! That's how easy it is to install PAD's POWER+CHIP in your 1992-1995 Mercedes Benz V8.
Simply remove the Eprom chip using the step by step instruction sheet and install more hp and torque.
To boost horsepower output, the chip has been re-designed to increase the fuel injection and timing parameters
allowing for increased usable power through out the RPM range. PAD chip is warranted for 90 days for defects due to eprom failure. No other warranty is expressed or implied. |
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Beside Ham Radio, I have another avocation, Mercedes
Benz automobiles. Here's my story to date. |
| Model: | S 500 (140.070 chassis) |
| Engine: | 119.970 |
| Mode of Operation: | 4-stroke engine, gasoline injection |
| No of Cylinders: | 8 |
| Bore: | 3.80 in (96.50 mm)dB |
| Stroke: | 3.35 in (85.00 mm)Hz |
| Piston Displacement: | 303.5 cu in (4937 cm^3) |
| Compression Ratio: | 10:1 |
| Output: | 315 hp/5600 rpm (245 kw/5600 rpm) |
| Max Torque: | 347 ft-lb/3900 rpm (470 Nm/3900 rpm) |
| Max Engine Speed: | 6000 rpm |
| Firing Order: | 1-5-4-8-6-3-7-2 |
| Ploy-V-Belt: | 2460 mm |
| Transmission | |
| Downshift points: | D to 3: 124 mph (200 km/h) 3 to 2: 79 mph (127 km/h) 2 to B: 46 mph (74 km/h) |
| Rims - Tires | |
| Rims: | 7-1/2 J x 16 H 2 |
| Tires: | 235/60 R16 100H |
| Electrical System | |
| Generator: | 14V/140 A |
| Starter Motor: | 12V/1.8KW |
| Battery: | 12V/100 Ah |
| Spark Plugs: | Bosch F8DC4 (org F9DC0) |
| Electrode Gap: | 0.031 in (0.8 mm) |
| Tightening Torque: | 15 - 22 ft lb (20 - 30 Nm) |
| Main Dimensions | |
| Curb weight | 4,785 lb; 1994, 4,695 lb |
| Trunk capacity | 14.2 cu ft |
| Overall Length: | 199.4 in (5065 mm) |
| Overall Width: | 75.3 in (1912 mm) |
| Overall Height: | 57.3 in (1455 mm) |
| Wheel Base: | 115.9 in (2945 mm) |
| Track, Front: | 63.1 in (1603 mm) |
| Track, Rear: | 62.0 in (1576 mm) |
| Fuels, Coolants, Lubricants Capacities | |
| Oil Filter: | 8.5 US qt (9.0 l) |
| Automatic Transmission: | 9.1 US qt (8.6 l) Fluid change: 8.1 US qt (7.7 l) |
| Rear Axle: | 1.5 US qt (1.4 l) |
| ADS: | 2.1 US qt (2.0 l) |
| Power Steering: | 1.4 US qt (1.3 l) |
| Front wheel hubs: | 2.1 oz (60 g) |
| Windshield washer: | 5.3 US qt (5.0 l) |
| Cooling System: | 16.4 US qt (15.5 l) |
| Fuel Tank: | 26.4 US gal (100 l) |
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Reminder: Don't Forget to Replace the Motor Mounts!
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We trend to forget about the car's motor support, the infamous motor mounts! Well, you shouldn't! When the MMs collapse, crack
and split as shown, the engine effectively sits on the frame. All engine vibrations, and torque are transmitted into the
frame. Enough words, where's the car . . . .
The MB S-Class has consistently defined the capabilities that modern passenger cars should aspire to. From performance and
comfort, to passive and active safety features, to reliability and durability, the S-Class has been an innovator and a
leader. Powerful, agile and reassuringly secure, an S-Class automobile imparts sheer driving pleasure and enduring
satisfaction like no other automobile in the world. |
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New Wheels and Tires . . .
Michelin Pilot Sport - Rear 255/45ZR - 18; Front 245/45ZR - 18; Wheels: Eurotech Model 530; 18" x 9.5 - rear. This wheel is extremely wide (1" greater than the 8.5) which makes it too big for the W140. Click here to see why.
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Engine . . .
The gasoline-powered 5 liter engine uses four valves per cylinder to increase the engine's capacity to 'breathe'. The faster
and deeper the engine breathes, the more power it produces. To help improve torque at low and mid rpm, the intake-valve timing
of the engine automatically adjusts. The result is vigorous off-the-line launch and reassuringly swift passing power. |
Interior Views . . .
Much of what makes a Mercedes Benz a Mercedes Benz is the result of hand craftsmanship. The many Mercedes workers have learned
the arts of upholstery and woodworking and these are passed down from skilled masters. |
 The library quiet of the S500 is built to spirit the occupants over the road in security and elegance. Each is built to meet the highest expectations of its owner. |
The Navigon GPS Car Navigation, Model 7100 guides you turn by turn to your destination with high accuracy. It provides voice guidance
prompts so you can keep your eyes on the road, while having the visual monitor for reference. It has been rated as very user
friendly due to its ease of use and many options available for choosing your destination. |
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Recent Interior Additions . . .
Thanks to various vendors, I've added a few extra enhancements to the interior. Also can't forget my wife's Christmas
present that you see below; a instrument cluster overlay. Came direct from MB in Germany so it's probably from a newer
S600 as a custom upgrade.   
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Mercedes-Benz People
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This section will highlight people that do unusual things to and about Mercedes-Benz cars. I started about 4 years ago when a friend of mine in the insurance business told me about purchasing cars directly from him. At that time I didn't think much about it but now every 3 months I purchase a Benz, rebuild and sell it. Funny cause it's not for the money but rather a hobby. Besides nothing like seeing the end results of these beautiful cars! I don't do this full time. I'm a Systems Administrator (MCSE) during the day and rebuilding cars is my hobby. The only thing I don't do on these cars is the welding, painting and well, now I will be able to reset codes thanks to your scanner. All else is done by me and sometimes with my wife's help! I don't have a web site but you are welcome to show off these pictures on your site. I'll send you pictures of the '89 190E 2.6 that I restored for my wife in the near future. Rudy Pullano Click here to send email to Rudy:
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DISCLAIMER - K6JRF Page "My Mercedes-Benz S500 Coupe"
Mercedes-Benz is a trademark of Mercedes-Benz of North America, Mercedes-Benz USA LLC and other Mercedes-Benz corporations.
The words Mercedes-Benz is solely used to identify a make of automobile and do not imply or indicate any affiliation or
relation of the "My Mercedes-Benz S500 Coupe" with the manufacturer or their distributors. Copyright © 2000-2018 by K6JRF. |
Mercedes Links
. . . Victor's excellent site for MB repairs of Wiring Harness and Throttle Actuator called RestoreYourMercedes. . . . Diag Trouble Codes for 'E' class (190s, 300s, 320s) DTCs by Bat Automotive . . . Pictorial DIY articles for Mercedes repairs at Peach Parts Wiki . . . Find MB replacement parts at the Peach Parts Shop . . . More places for MB replacement parts at the R&R Import Auto Parts . . . Mercedes scanners, tools, test and diagnostic equipment at Technic Tool Supply . . . Unique all-natural engine cleaner that works at Auto-RX. . . . Repair/rebuild of Mercedes Climate Control Systems and Electronic Throttle Actuator by Beckmann Technologies Miscellaneous Links
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