check engine light
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From: Long Island, New York
1994 MB E320, 1988 Porsche 951
check engine light
hi guys, the "check engine" light just came on in my '94 E320, can someone direct me to the link on how diagnose this? thanks......
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From: Atlanta
1995 S14
Depending on what part house AKA Auto Parts Store you go to, you can get it diagnosed for free. I believe O'Reilly, Autozone and Advance all diagnose for free. They hook it up to a machine and it will give you and idea of what might be wrong.
Last edited by Garfunkle_W124; Feb 24, 2007 at 04:01 PM.
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From: Anaheim, CA
a TVR Cerbera Speed Twelve
Reading Fault Codes
- Turn ignition key to “on” position, all dash warning lights will be on.
- Remove cover on 16 plug diagnostic connector near battery.
- To read check engine light codes (DM), hold down built in button next to LED light for 3 to 4 seconds, LED light should be on, release button, count the number of LED flashes that follows. Hold button down for 3 to 4 seconds again to check for another code. Keep doing this until all codes have been read and first code comes up again.
- To clear codes - hold down button for 10 to 12 seconds, turn ignition key off for a few seconds, repeat to clear additional codes. Ignition must be turned off between each code cleared.
To check other modules using code tester – insert black plug into socket #1 (ground). Insert red plug into socket #16 (12V power). Insert yellow (third color) plug into socket to be tested, for example #8 or #14. Repeat steps above for LED button using code tester button and LED. Same process for deleting codes as with LED button.
Check appropriate fault code list to determine fault.
Checks codes as quickly as possible at the first sign of a problem. Codes spread from one module to another and will often show up twice or cause other codes. The sooner you check the codes the more likely you are to identify the source problem.
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From: Motor City
95 E320 Cabriolet, 108K
Your car is pre-OBD2, and has on-board diagnostics that are relatively easy to access... easier that OBD2.
These two links should have all the information you need to make the code reader, use it, and interpret the codes. It covers what battlecat wrote, plus some.
http://www.mercedesshop.com/shopforu...d.php?t=107630
http://www.geocities.com/MotorCity/D.../cs1000_mb.pdf
Read through the info, then post back if you need clarification on anything.
These two links should have all the information you need to make the code reader, use it, and interpret the codes. It covers what battlecat wrote, plus some.
http://www.mercedesshop.com/shopforu...d.php?t=107630
http://www.geocities.com/MotorCity/D.../cs1000_mb.pdf
Read through the info, then post back if you need clarification on anything.
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From: az
bmw
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From: Long Island, New York
1994 MB E320, 1988 Porsche 951
Many thanks to all. I tried resetting the CEL without reading codes by disconnecting the (-) batt cable for a few minutes, light went out, but came on again next day. Guess I got to do it the proper way. I'll post any relevant information or problems with the code readings.
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From: Long Island, New York
1994 MB E320, 1988 Porsche 951
hey guys, I can't seem to find the built in button or the LED light next to the 16 plug diagnostic connector. attached is a photo of the 16 plug connector with the cover off next to the battery. would appreciate help in locating the button and light. the car is a '94 e320. thanks........................
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From: Long Island, New York
1994 MB E320, 1988 Porsche 951
seems the photo didn't attach itself, gotta figure out how to get pic into post........
Last edited by Techno Duck; Mar 12, 2007 at 12:34 PM.
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Thread Starter
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From: Long Island, New York
1994 MB E320, 1988 Porsche 951
just went out to the car to look again, found the button and light by #2 connector, it was covered by 1/4 inch of crud, thanks Kestas very much! I hope the CEL isn't a serious problem. it seems to come on ONLY on an engine startup. it never comes on while engine is running. I been disconnecting the (-) battery terminal to turn off the light on a temp basis.....
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From: Long Island, New York
1994 MB E320, 1988 Porsche 951
Kestas, I ran the pulse diagnostic, it came back with 3 pulses, which is the "coolant temperature sensor". is it one of the three connectors on the thermostat housing? also, I clear the fault codes yesterday and the CEL hasn't come back on yet, usually comes on when I start the engine. thanks for your help..............
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From: Motor City
95 E320 Cabriolet, 108K
Was the code from the built-in diagnostic unit (Button 2), or from Pin 8 or 14? Which chart did you use to interpret the code?
If it's from the built-in diagnostic unit, Code 3 means "Lambda control faulty".
Make yourself a code reader and get the codes from Pin 8 and Pin 14. This may help determine what is going on. Once you read the codes, erase them, then reread what comes up a few days later. It's not unusual to get spurious codes from engine hiccups.
If it's from the built-in diagnostic unit, Code 3 means "Lambda control faulty".
Make yourself a code reader and get the codes from Pin 8 and Pin 14. This may help determine what is going on. Once you read the codes, erase them, then reread what comes up a few days later. It's not unusual to get spurious codes from engine hiccups.
Thread Starter
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From: Long Island, New York
1994 MB E320, 1988 Porsche 951
Kestas, the reading was from button 2, the chart to interpet the 3 pulses came from: http://www.mercedesshop.com/shopforu...9&postcount=13
it's been 2 days now and the CEL hasn't come back on, the dash temp guage reads normal, the radiator fan seems to kick on properly. wrong interpetation of code? what's a lambda control? again, thanks much for your help.......
it's been 2 days now and the CEL hasn't come back on, the dash temp guage reads normal, the radiator fan seems to kick on properly. wrong interpetation of code? what's a lambda control? again, thanks much for your help.......
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From: Motor City
95 E320 Cabriolet, 108K
The chart is for an 88-89 model benz. I think that is where the discrepancy lies.
Read through the information I linked for you in Post #4. This should bring you up to speed on your model. Make the code reader* and read the second level of codes. This should give more detail.
Lambda control is another term for air/fuel mixture control. Lambda can affected by the O2 sensor and air mass meter. A simple no-cost thing you can do is clean the air mass meter sensing element with contact cleaner or alcohol. But you have to be careful because the sensing element is very fragile. Hopefully you're not using a K&N filter!
(*) - Or use the multimeter method, which will give the same result. In my opinion the home made code reader is more convenient.
Read through the information I linked for you in Post #4. This should bring you up to speed on your model. Make the code reader* and read the second level of codes. This should give more detail.
Lambda control is another term for air/fuel mixture control. Lambda can affected by the O2 sensor and air mass meter. A simple no-cost thing you can do is clean the air mass meter sensing element with contact cleaner or alcohol. But you have to be careful because the sensing element is very fragile. Hopefully you're not using a K&N filter!
(*) - Or use the multimeter method, which will give the same result. In my opinion the home made code reader is more convenient.
