No fuel injector ground?

KENKICK

MEMBER
2008 CHEVROLET MALIBU
2.4L
4 CYL
2WD
AUTOMATIC
170,000 MILES

I have power for 2 injectors, but I have no ground. I checked all wires, all fuses, I even replaced the ECM but still no ground. I hooked up Noid light nothing the light don't even come on at I hooked it up to all 4 injectors connector nothing from any. I used a test light to check power side all 4 have power but no ground at all. I'm stuck please help. Thank you, what else am I missing?

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,226 POSTS

Hi,

The ground path for each injector is provided by the powertrain module. If lost all grounds, there is a chance the PCM has failed or the PCM has lost ground.

Do this and let me know what happens. Connect the alligator clip side of a test light to the battery positive. Disconnect an injector and probe the ground wire with the test light. Have a helper crank the engine. The light should strobe. See if that happens.

If it doesn't, then check the PCM ground (G107). See pics below.

Let me know.

Take care,

joe

See pics below. I highlighted the ground wires for the injectors. Also, the PCM ground can be in one of three locations based on the vehicle's RPO. I attached locations below.

Images (Click to make bigger)

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Wednesday, August 23rd, 2023 AT 9:59 PM

KENKICK

MEMBER
2 POSTS

My apologies for late response, but I did do the light test and it didn't light up or strobe at all I found the ground location it by the knock sensor and that fine but I cleaned it and reattach it back and still nothing my I add this is a new PCM just got it in on Friday but both of them (PCM) display the same problem could it be anything to do with my pass lock anti-theft module or ignition switch just and thought. Thanks again for the help.

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Thursday, August 24th, 2023 AT 11:48 AM

JACOBANDNICKOLAS

MECHANIC
108,226 POSTS

Hi,

Is the theft light staying on or flashing? If it is, turn the key to the run position and allow it to stay there for approximately 10 minutes. The theft light should turn off and the vehicle should start if that is the cause.

The control module enables the appropriate fuel injector pulse for each cylinder. The ignition voltage is supplied directly to the fuel injectors, which is present. The control module controls each fuel injector by grounding the control circuit via a solid-state device called a driver. That is what was lost. The ignition key allows the power to reach the injectors, so I don't think that is the issue

Where did you get the new PCM? Also, have you checked to see if there are any codes now stored in it?

Let me know.

Joe

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Thursday, August 24th, 2023 AT 7:55 PM