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Old 04-05-2004, 11:34 AM
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Join Date: Aug 2003
Location: Phoenix
Posts: 3,726
Fault Code Confusion

Car is a 1992 400E. The Check Engine light is on. The engine stumbles when it's warm. I have found a 8 pole diagnostic connector with a button and LED light. This gives me a code 7, which may be "Ignition System Faulty" if I'm looking at the right list of codes. This would be consistent with the performance symptoms.

But next to the 8 pole connector is what appears to be the round 38 pin Diagnostic Connector - I can't be sure because I can't seem to get the cap off of it.

So what's the difference between the 8 pole connector and the 38 pin connector? And what does it take to get the cap off the round one?

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Old 04-05-2004, 03:29 PM
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Join Date: Nov 2003
Location: MA
Posts: 217
I have a 92 400E as well (mine doesnt have the button and light, I believe it was only required in CA).

Anyway, the 38 pin connector is under the cover of the computer box. The box where a battery would normally be - there should be pne round cover about 2 in in dia. Use the appropriately sized socket to remove (its a 1/4 turn like a gas cap) and there's the 38 pin in all its glory. Alternatly you can remove the entire cover - 4 allen head bolts.

I think the cover you are refering to is the connector for the electronic throtle actuator. Its about the right size and is in that area.

You will need to build a code reader to get the code pulses from the 38 pin socket. This is covered in a variety of places (do a search) including my favorite

He is a member and posts regularly.

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Old 04-05-2004, 06:25 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
When you are using the 8 pin connector I think there is only the DM (diagnostic module) is available there.

if the DM tells you that there is a ignition failure you will want to inquire on the DI module, pin 17 in the 38 pin connector.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 04-06-2004, 11:50 AM
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'94 S500: only 793 sold!
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,933
deanyl, from what you said . . .

it's sounds like the good ol- "ETA" is bad. But you need to pull codes to be sure from the EA, pin 7 to see what DTCs are stored. I would also check the LH module, pin 4 and ASR, ABS on pin 6.

Check my page (click on the 'www' icon below) and check out Menu #24. You see some representative codes when my ETA went bad.
Regards . . . . JimF
'94 S500 Cpe

Visit my Mercedes Web Page
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Old 04-06-2004, 01:32 PM
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Join Date: Aug 2003
Location: Phoenix
Posts: 3,726
I found the 38 pin - take off the computer box cover it sticks out like a sore thumb. The other round plug wires head off under the air filter housing so it probably does go to the ETA. On the eight pole connector, I was not aware that it was a CA model but it's possible as I am in AZ. I plan to build a code reader but probably not for a few days. Jim, I had already been to your site - that's how I figured out what a code 7 was. I do suspect ETA at this point. Thanks to all.

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