Ignition control module and PIP sensor question
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Laughing Gas
Joined: Oct 2014
Posts: 793
Likes: 25
Ignition control module and PIP sensor question
1994 Club Wagon 5.8W E4OD
When the ICM and the PIP fail (independently of course), are the symptoms exactly the same?
and does the fuel pump relay get activated during a PIP failure?
It does not seem to during a ICM failure.
Thanks.
When the ICM and the PIP fail (independently of course), are the symptoms exactly the same?
and does the fuel pump relay get activated during a PIP failure?
It does not seem to during a ICM failure.
Thanks.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
The ICM can fail multiple different ways.. sometimes not even generating codes and it won't necessarilly prevent the motor from running. A pip failure usually results in a no start condition and a code for no PIP signal.
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Laughing Gas
Joined: Oct 2014
Posts: 793
Likes: 25
1994 Club Wagon, 5.8W, E4OD, 242,xxx miles
Thanks,
Conanski (or anyone else) would you happen to know if, when the pip fails does the vehicle act as if its a air or fuel issue? Or does it just crank and not even try to start? like the ICM does when it fails.
Thanks.
Conanski (or anyone else) would you happen to know if, when the pip fails does the vehicle act as if its a air or fuel issue? Or does it just crank and not even try to start? like the ICM does when it fails.
Thanks.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
The PIP signal originates in the distributor from the hall effect sensor, without that signal the motor will not even attempt to fire. The ICM passes that signal along to the ignition coil with commands from the PCM to alter the timing of those pulses. Most ICM failures are partial where the signal is inconsistent(engine misses) or it falls apart at higher rpms(engine won't rev) or it can be heat related where it works fine when cold but shuts off like a light switch once it reaches a certain temperature, only to work fine again if allowed to cool off. It can also fail completely and never come back of course but that was more the exception in my experience. However now that these electronic modules are manufactured offshore it seems quality has seriously gone downhill and many are DOA or have a lifespan of minutes or days before completely failing.
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