Question about 1989 GMC Sierra
Code 43 indicates comunication error with ''electronic spark control'' module in the ditributor. replaced said module and the truck still runs in default mode and still has 43 error code. information available in haynes and chilton books is very lacking in detailed info for diagnosing. need data line info to diagnose whether the problem is the ecm (computer), or the pickup in the ditributor. I am an electronics repair technition and have any electronics repair equipment I may need. just need info!!!!
When you replaced the ESC did you disconnect the battery? If not then it is most likely that the vehicles ECM is still running in loop mode because it doesn't realize it has been changed. Clearing the codes, disconnecting the battery should do the trick.
Posted on Nov 13, 2008
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