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Hi
2007 Dodge Caliber
1.8 liter engine
Manual transmission
Dtc's:
P02004
P0139
P0420
And several speed control Dtc's
The main concern I have is for the p02004, the description states "intake manifold runner control stuck open"
No symptoms to my knowledge, customer just wants the check engine light to go off.
I toggled the imrc motor with a scan tool and it does move but only a short distance. I then unbolted the imrc from the intake manifold and manually turned the rod that links all of the butterflies and turns them all at the same time. The rod only moved a short distance as well, I know I will have to replace the intake manifold due to this but I'm having an issue with my voltage readings on the imrc connector.
My question is : with the connector to the imrc motor unplugged and key on why would I have 7.5 or so volts on the 5 volt reference wire?
Chrysler made a tsb for this code, and the procedure is to replace intake manifold and reflash the pcm.
My next question is : if the pcm is in need of a reflash will this make a 5 volt reference wire read 7.5 or so volts?
The car does run and drive and doesn't seem to have problems other than this illuminated engine light.
If any of you have seen a reference wire do this please explain to me why.
Thank you for the help!
Last edit: 8 years 3 months ago by A Haywood84. Reason: Fixed
is it a brown/light green wire?? if so its shared between other sensors the camshaft and map sensor. id check it at those two sensors and see if you get 5 volts instead of 7.5 volts. id check the ground at the manifold tuning valve
Maybe I'm wrong, but it sounds like you're seeing open circuit bias voltage on a power side controlled motor, not a reference voltage on a signal wire. If the pcm detects the 7.5v, it knows the circuit is open and will flag an open circuit code. Where as that voltage would be pulled to ground in an intact circuit.
What is the voltage on the she wire plugged in?
It's doubtful that a reflash would change any voltage output from the PCM. That's all determined by resistors and voltage regulators that are a part of the board. A reflash will just update the software. Just like your PC USB port only runs at 5v, no matter what version of Windows you're running.
I didn't check a diagram, so feel free to disregard this if I'm way off base.
Thanks for the response! I think I may have answered my own question though.
How does this sound to you?
I had my voltmeter hooked up to the battery and instead of measuring the 5 volt reference wire with my positive lead from my volt meter I measured it with the negative lead by mistake! So It makes sense to me now that 12.5 volts ( battery voltage) minus 5 volts ( reference voltage) = 7.5 volts!
Have you ever done this or does this make sense to you? I don't have a lot of hands on circuit testing experience, but this makes sense to me.
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