Rick,

Here are instructions I found on this forum (from Battlecat714):

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.

****

I've been reading codes for the last few days, so my old brain is rather fresh on the subject. So...yell if you need a hand. Plus, I have links to the code results. And, I just built the home brew tester...after putting it off for months...and it's easy. So just yell if you need advice.

Now...what to do after you get the codes...well, that's where I fall short and need advice from others on here.

Jim

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Syntax26

1995 MB E420 (lowered)
1989 MB 300SE (sold to brother)
1975 MB 280 (sold)
One damn fine jacked-up golf cart