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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15133
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Nnot getting voltage tothru ignition wire to starter.

Customer Question

nnot getting voltage tothru ignition wire to starter. replaced starter , neutral sagety switch and ignition in column. getting ready to go to salvage and by ecm. can crank over if you supply power under relay fuse box under hood. was having an issue when you did crank it would sieze up my doorlocks and nothing would work until you pulled ignition fuse under hood.
Submitted: 1 year ago.
Category: Chevy
Expert:  Jared D replied 1 year ago.

Do you want to test it before you replace it?

Here is one method, but it requires a scan tool:

1. Check communication to Powertrain Control Module (PCM) with a scan tool.

2. If no communication, check if the scanner will communicate with the Antilock Brake System (ABS) or air bag modules.

3. If the scanner has communication with other modules but not the PCM, check powers and grounds to the PCM and ohm the data line wire from the DLC pin 2 to the PCM pin 58.

4. If the powers and grounds are OK and the Data line has continuity, replace and reprogram the PCM.

Expert:  Jared D replied 1 year ago.

Here is the accompanying wiring diagram to the test procedure.

Customer: replied 1 year ago.
dont have a scanner
Customer: replied 1 year ago.
can you rent scanners?
Customer: replied 1 year ago.
i guess we are done didnt help me any
Expert:  Jared D replied 1 year ago.

Sorry I stepped away for a second.

Expert:  Jared D replied 1 year ago.

Some parts stores will lend out scanners with a deposit. Diagnosing and replacing a PCM without one is nearly impossible.

You might check the wiring under the fuse box first though. It's very problematic on this truck.