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Discussion Starter #1
I've posted the following in the Spider forum with no results -- is there anyone here that can help?

I'm needing some help reading motronic codes on my 90 Graduate. I can get to the first code but can't figure out how to get to any more.

My shop manual says "Every flashing code is endlessly repeated until the request of the next malfunction." How do you request the next malfunction?

In cool damp weather I get an intermittant check engine light -- it happened last spring, went away all summer, and is back now. The code I read is 1221 for the AFM.

Also, is there a better resource on the motronic system than the shop manual?

Any insight will be appreciated.
 

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Discussion Starter #3 (Edited)
thanks

Craig,

AROC-USA lists a Motronic System Repair Manual in the library -- I'm a member so I'll request a copy.
 

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I've posted the following in the Spider forum with no results -- is there anyone here that can help?

I'm needing some help reading motronic codes on my 90 Graduate. I can get to the first code but can't figure out how to get to any more.

My shop manual says "Every flashing code is endlessly repeated until the request of the next malfunction." How do you request the next malfunction?

In cool damp weather I get an intermittant check engine light -- it happened last spring, went away all summer, and is back now. The code I read is 1221 for the AFM.

Also, is there a better resource on the motronic system than the shop manual?

Any insight will be appreciated.
Chances are then that is the only code in memory. Check/clean connector at AFM, disconnect battery for 15-30 seconds to clear code and then restart engine and see if CEL comes back on. If it does rerun test.
 

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Discussion Starter #5
Steve,

Thanks, I've cleared the codes by disconnecting the battery. I now get the 4444 code for no stored codes.

The CEL is intermittant -- usually only in cool damp weather. Next time it occurs I'll dig back into troubleshooting.
 

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This is a repost from your post from yesterday in the spider section. It covers retrieving codes...including subsequent codes from the CEL.

From the John M and Tom Gubi show circa August 2004 here on the BB:

You will need to pull the code from the ECU and reply back. Here is how you pull the code. It is flashed through the check engine light through a series of long and short flashes. Here is how to pull the code:

1. Turn the ignition key to the "on position" so that all the lights light up on the dash. Do not start the engine nor have it running.
2. Remove the access panel from your carpeted rear deck behind the passenger seat.
3. Locate the ECU button. There is a button on the outside of the steel box that the ECU sits in. The button faces the passenger side "b" pillar, the passenger side rear speaker, and seat belt retractor. Note that you will have to reach around to the outside of the steel box that the ECU sits in so have long flexible fingers or skinny ones that can fit between the carpeted deck and the top of the steel box.
4. Depress and hold the ECU button for 5 secs.
5. Release the button once the check engine light goes off.
6. The Check Engine light will flash the code.
7. Once the code is flashed (and it will repeat) you can simply turn the ignition key to the off position.

Here is how to read the code:
The check engine light flashes the code by long and short flashes.

1. The check engine light does a long flash followed by a long delay to say "here comes the code"
2. Then the individual numbers will be flashed by short flashes with a long delay between each seperate number.
3. The error code is a 4 digit code beginning in the number 1.
4. Code repeats over and over.
Here is an example:

F=Long flash
f=short flash
D=long delay
d=short delay

Error code 1234 1234

F........D.......f..D........f..d..f..D.......f..d ..f..d..f..D..........f..d..f..d..f..d..f..D...... .......F........D.......f..D........f..d..f..D.... ...f..d..f..d..f..D..........f..d..f..d..f..d..f.. D.............

So this would be read: Code 1234 Code 1234
-------

I'll add the following: you most likely have multiple codes stored...one for every time the light has come on. These may be the same code over and over again or they may vary. It's a good idea to go through them all and then clear the computer.

After each code flashes, you hold down the button for a couple of seconds and then release it...it will then start flashing the next code. Once you have gone through all the codes, the computer will flash 4-4-4-4. At this point you can clear the codes by holding down the button for a full ten seconds (make sure you wrote down all the other numbers first). It may take a while to get through all the codes, so be patient.

Post the codes you get here and it may give us some idea of what the problem is.

I have that motronic manual....somewhere. If I can find it...I'll scan it and post it too.

Best Regards,
John M
 
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