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#1
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Check engine light - on after key out!
This is for my W124, 300E - check engine light has always been on, with engine running. I'm guessing it is the O2 sensor, saving that project for another day.
However, the last few fays, the light STAYS ON even after I shut off the engine and TAKE THE KEY OUT I replaced the overload protection relay in October of last year. Could it be defective already? Or is the car possessed by some menehunes playing tricks on me?
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1991 300E 124.030 103.983KE 722358 03 412178 207K 1979 240D 123.123 250K (Project car) 2000 Ford Ranger, 187K 2015 Dodge Ram 1500 EcoDiesel 37K |
#2
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Same thing happened to my '94 when the engine wiring harness failed.
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#3
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Quote:
Would it cause problems if I drive it while the part is getting ordered?
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1991 300E 124.030 103.983KE 722358 03 412178 207K 1979 240D 123.123 250K (Project car) 2000 Ford Ranger, 187K 2015 Dodge Ram 1500 EcoDiesel 37K |
#4
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Could damage the engine computer , start a fire ( even with engine off ) damage to sensors. The bio degradable wiring issue extends to under dash and the rest of the car, under hood fails first due to heat.
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#5
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Quote:
But I can't order the part yet because there is no number on the wiring harness.
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1991 300E 124.030 103.983KE 722358 03 412178 207K 1979 240D 123.123 250K (Project car) 2000 Ford Ranger, 187K 2015 Dodge Ram 1500 EcoDiesel 37K Last edited by mbzr4ever; 03-12-2015 at 09:44 PM. |
#6
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if you don't have a alternator light,maybe voltage regulator.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#7
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Quote:
There is one that looks like a battery - does that represent the alternator?
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1991 300E 124.030 103.983KE 722358 03 412178 207K 1979 240D 123.123 250K (Project car) 2000 Ford Ranger, 187K 2015 Dodge Ram 1500 EcoDiesel 37K |
#8
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Replaced the EUC, but the check engine light still stays on, even after the key is out.
The code says 1, which I understand to mean no faults. Am I not clearing the reader correctly?
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1991 300E 124.030 103.983KE 722358 03 412178 207K 1979 240D 123.123 250K (Project car) 2000 Ford Ranger, 187K 2015 Dodge Ram 1500 EcoDiesel 37K |
#9
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200K on the clock, the first thing I would do is check the electrical portion of the ignition switch, is there is a problem with that it could easily manifest itself as "electrical ghosting" like this.
And that could be pretty quickly and easily diagnosed or eliminated by swapping some other electrical switch into place of the original, even and unknown used switch is highly unlikely to have the exact same specific flaw so any change from the present state of that light illuminated would confirm the original switch as the source of the problem. |
#10
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So BatteredBenz, is it as "simple" as changing out the existing ignition switch?
Like this ?: Pelican Mercedes-Benz Tech Article - Replacing your Ignition Switch and Lock on your Mercedes Benz - 190E, W124, W126, W201, W123 Good idea, I will try this before the wiring harness.
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1991 300E 124.030 103.983KE 722358 03 412178 207K 1979 240D 123.123 250K (Project car) 2000 Ford Ranger, 187K 2015 Dodge Ram 1500 EcoDiesel 37K |
#11
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Quote:
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#12
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A quick way to test the Ig SW theory is just to unplug it.
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#13
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Great point! That indeed would most easily isolate the switch from the equation, ruling it in or out as a potential root cause of the weirdness.
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#14
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Quick update, had been rainy and today a nice day to be outside to follow up:
Connected a light pen from to neg cable to neg post to observe when light would go out when fuses were taken out. Discovered the removal of 9 would make the light go out, but only when C and 9 we both out at the same time. If 9 was taken out, but C was left in, the light would stay on. EDIT: 9 controls the diagnostic module, among many other functions. Noticed the transmission selector lever position light is not working! What does this mean?
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1991 300E 124.030 103.983KE 722358 03 412178 207K 1979 240D 123.123 250K (Project car) 2000 Ford Ranger, 187K 2015 Dodge Ram 1500 EcoDiesel 37K Last edited by mbzr4ever; 09-04-2015 at 02:40 PM. |
#15
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The transmission selector lever position light was fixed with a change of the bulb.
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1991 300E 124.030 103.983KE 722358 03 412178 207K 1979 240D 123.123 250K (Project car) 2000 Ford Ranger, 187K 2015 Dodge Ram 1500 EcoDiesel 37K |
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