1999 Chevy Tahoe 4x4 5.7L no start issue
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- cheryl hartkorn
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- John Curtis
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Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
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- John Curtis
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Check the connectors and make sure they’re making. Good contact.
2 unplug the ICM and use a headlight bulb or something that has a decent current as a test light and see if the wire is able to handle load.
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
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Check the connectors and make sure they’re making. Good contact.
2 unplug the ICM and use a headlight bulb or something that has a decent current as a test light and see if the wire is able to handle load.
You might want to try a bypass test and see if you can make it fire that way.
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
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Bought new crank sensor. Tested 12 v good ground. Checked signal to PCM. All is okay.
To make sure I'm not tripping, I pierced all three wires at PCM, all had same reading and are good.
Then replaced ICM 4 wire, all checked out good with voltage.
Checked signal and ground at com all checked good.
Checked coil have power to it, the signal wire white and black is giving signal. But no fire out of coil. Absolutely none.
On the ICM, we do have trigger signal from PCM, and do no have signal coming from the ICM.
Changed cam sensor, okay checked good.
Changed Distributor cap, and rotor button they check good.
Changed all plug wires, pulled all plugs checked them. And they check good.
Changed ignition cylinder, and column.
Just for shits and giggles I took distributor out and put #1 TDC.
On the coil the link wire is positive, white tachometer, and black and white ignition signal, I took another plug and put on the coil link wire on connector which is 12v without anything connected to. With key on 12v going on and 12v coming out of white wire wire and white and black wire.
I had a code of 1351, said ground #1 cylinder. How can the ICM send the ignition signal to the coil when the coil is putting out 12v?
This is why I can't get fire coming from coil I think.
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- John Curtis
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CJ1488 wrote: Here is a list of all the things I have done and tested:
Bought new crank sensor. Tested 12 v good ground. Checked signal to PCM. All is okay.
To make sure I'm not tripping, I pierced all three wires at PCM, all had same reading and are good.
Then replaced ICM 4 wire, all checked out good with voltage.
Checked signal and ground at com all checked good.
Checked coil have power to it, the signal wire white and black is giving signal. But no fire out of coil. Absolutely none.
On the ICM, we do have trigger signal from PCM, and do no have signal coming from the ICM.
Changed cam sensor, okay checked good.
Changed Distributor cap, and rotor button they check good.
Changed all plug wires, pulled all plugs checked them. And they check good.
Changed ignition cylinder, and column.
Just for shits and giggles I took distributor out and put #1 TDC.
On the coil the link wire is positive, white tachometer, and black and white ignition signal, I took another plug and put on the coil link wire on connector which is 12v without anything connected to. With key on 12v going on and 12v coming out of white wire wire and white and black wire.
Probably more of a problem with how I’m reading it however, for the ICM the white wire with a black stripe should fire your coil.
The black wire with a white stripe is a ground wire.
I had a code of 1351, said ground #1 cylinder. How can the ICM send the ignition signal to the coil when the coil is putting out 12v?
This is why I can't get fire coming from coil I think.
Also...: I just re-read from the top and didn’t see anything on it so I’ve gotta ask do you have injector pulse?
Do you have reference voltage on an easy to reach sensor?
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
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- John Curtis
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No spark + No injector pulse is a different problem than
No spark + Good injector pulse
Also can you check with a voltmeter one lead on battery ground and the other lead and test any sensor like a MAF sensor check all wires and see if any of them show 5v with sensor unplugged? The. Plug it in and take a reading and see if it changes?
Report your findings
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
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- cheryl hartkorn
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