Question about 2000 Jeep Grand Cherokee

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Electrical malfunction cylendars 4 7 and 8

The readout on my check engine light described an electrical malfunction for my injectors. Where should i start checking/ what could cause this. The only symptoms i have are my jeep idle's a little funny and sometimes it will bog down when i accelerate but i have no loss of power or acceleration.........

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  • tbone3622392 Feb 17, 2009

    It ended up being a the throttle positioning sensor



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This is a sensor problem possibly the air flow meter ,take vehicle to dealers for a proper diagnostics

Posted on Nov 06, 2008

  • Colin Stickland
    Colin Stickland Feb 18, 2009

    yes its always the way,hence i said dealers.without the the vehicle in front of me it can be very difficult as more than one sensor can cause the same sort of problems



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You describe an electrical issue. First of all, how do you know the injector pulse is 'erratic'?
Is the ignition spark ALSO erratic? If so, how so? I need specifics, details regarding your description of 'erratic'. I can assume/presume you have experience/education/training in automotive diagnostics... ??

In my electrical/eagelectronics experience, you definitely have an electrical/electrodynamic problem/issue.

Tell me what you've done, diagnostically, to determine (isolate) the 'CAUSE' of this erratic injector pulse. What have you inspected/checked? What have you NOT inspected/checked?

Get back to me, then we can go from there.

However, first thoughts
The engine management computer (ECM/ECU/PCM) can cause/create the symptom you describe
The engine wiring harness also (chafed wires, bad ground circuits, etc.)
Malfunctioning senors (Crank Position Sensor (CKP), Cam Position Sensor (CPS),
Low Voltage Condition, etc.

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I have seen jeep TPS - throttle position sensors cause a surge like you describe , but not with injector circuit code's . The PCM - engine computer controls the injectors by supplying a PWM - pulse width modulation ground . Checking the electrical circuits for those injector's would be the thing to do . Do you know how to test electrical circuit's ? Plus checking the drivers (transistors ) inside the PCM should be done . Could be a wiring or computer problem or even those injectors could be failing .
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