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Discussion Starter #1
As the title states, I have a P1661 (malfunction indicator lamp fault) code popping and I can't put my finger on what is causing it. Has anyone seen this, and hopefully know of a reason that this code would pop? Thanks in advance...
 

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Discussion Starter #2
nobody has any ideas?
 

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Basically, this code means the PCM detected a fault with the MIL circuit, as has already been discussed here.

If there was a fault in the circuit that detects the fault, however, that might cause a "false positive" for this code.

If the circuits check out, the factory service manuals say the PCM needs to be replaced (the fault detection circuits are internal to the PCM)...
 

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Discussion Starter #6
Thanks man, does the manual give instructions on how to check for a fault in the circuit that detects faults?
 

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Discussion Starter #8
thanks man, I appreciate it...
 
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