Gpcm test

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Apr 8, 2024 | 07:25 AM

#16

Braxas12

4wd Low

Joined: Jan 2024

Posts: 10

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Quote:

Originally Posted by Baylinerchuck

I think what the guys are getting at is that it’s not really useful to test the function of the GPCM by voltage alone. You may get a voltage reading on the output of an electronic module, but when you plug it into a load that voltage sinks to zero since there is not sufficient current flow. You may find that when the module is powered up you’ll get a residual output voltage even when the output is not “switched” on.

Fair statement, yet I want to find out if the GPCM can be bench tested without frying it to see that voltage is in fact going to all 8 pins for output to the GP`s, from the source, the GPCM. This would entail mimicking the on time somehow from the PCM, When these are manufactured, they are not guessing they are good, they are actually tested. If this goes beyond a simple ohm test, 12v test, I am seeking confirmation from the community. I am sure I am not the only one that does not want to replace components that MAY be in fact be operating properly. If the harnesses going to the plugs ohm out under 2 ohms, that end is golden. Dont want to be fixing a truck for someone and say "I guess" that was was problem, would like to have tested it.

Apr 8, 2024 | 09:44 AM

#17

runthatjunk

More Turbo

Joined: Nov 2009

Posts: 527

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From: Kansas

You would need supplied voltage and a ground to the control pin to activate module. I would think a resistive load on each glow plug pin would be required for verifying their output.
then you need to verify the comms output with a scope (no idea what that would look like)
Even if it were simple relays an ohm test wouldn't work