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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

09 Chrysler Sebring 2.4L fuel injector control circuit.

  • TBins73
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5 years 11 months ago #34300 by TBins73
I am testing the fuel injector control circuit on a Chrysler Sebring 2.4L. It is a MPI, ground side switched injector with power being supplied via the ASD relay. With injector unplugged KOEO, the control circuit measures 4.60V at the injector connector and at the PCM. This is the same for all 4 injectors. Am I mistaken that this circuit should read 0V or near 0V with injector unplugged?
I searched factory repair info as well as Mitchell but was unsuccessful in finding direction.
Any help would be greatly appreciated.

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5 years 11 months ago #34307 by Cheryl
What’s the code it’s throwing? They might have specs in the code. But if all else fails install mood light in place of injector and see if it pulses running. Easiest test

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5 years 11 months ago #34341 by TBins73
There are no DTC's however I researched the injector open/shorted DTC's information with no spec. found.
I'm wondering if this voltage is a biased voltage used for diagnostics? Especially because it is the same across all 4 injectors (separate drivers)

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5 years 11 months ago #34342 by TBins73
Sorry Cheryl, I forgot to mention, a noid light will flash KOEC, however my incandescent test light connected to batt. positive will not KOEC.
If using bi-directional control to activate each injector, the test light will flash brightly.
I'm currently testing inputs affecting injector PW during cranking, but noticed the voltage on the injector signal wire and wondered if anyone else verified this is normal.

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5 years 11 months ago #34345 by Chad
While observing the 4.6v, touch the circuit with a test-light connected to battery negative. If the voltage drops to almost nothing, it is a bias voltage. If the voltage holds, and a Test-light dimmly lights, it is a true 4.6v.

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."

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5 years 11 months ago #34346 by Cheryl
Possibly bias voltage if it’s the same on all four injectors. Does it misfire? If not I’d say you might be right

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5 years 11 months ago #34379 by TBins73
Great tip Chad! I confirmed this is definitely a bias voltage.

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