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09 Chrysler Sebring 2.4L fuel injector control circuit.
- TBins73
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5 years 11 months ago #34300
by TBins73
09 Chrysler Sebring 2.4L fuel injector control circuit. was created 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.
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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- Cheryl
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5 years 11 months ago #34307
by Cheryl
Replied by Cheryl on topic 09 Chrysler Sebring 2.4L fuel injector control circuit.
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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- TBins73
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5 years 11 months ago #34341
by TBins73
Replied by TBins73 on topic 09 Chrysler Sebring 2.4L fuel injector control circuit.
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)
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
Replied by TBins73 on topic 09 Chrysler Sebring 2.4L fuel injector control circuit.
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.
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
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right.
Replied by Chad on topic 09 Chrysler Sebring 2.4L fuel injector control circuit.
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."
I have learned more by being wrong, than I have by being right.

The following user(s) said Thank You: Noah
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5 years 11 months ago #34346
by Cheryl
Replied by Cheryl on topic 09 Chrysler Sebring 2.4L fuel injector control circuit.
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
Replied by TBins73 on topic 09 Chrysler Sebring 2.4L fuel injector control circuit.
Great tip Chad! I confirmed this is definitely a bias voltage.
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