Compression Ignition Addict
Join Date: Dec 2007
Thanked 233 Times in 224 Posts
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No,no,no,,, That's not how it works....
You test the PCMs control by removing both sm wires from the relay and determine which one has 12v in it with the key ON. The wire that Does NOT is connected to the PCM and is what it uses to activate the GPs by supplying GROUND. Use a meter and connect one side of it to the battery (+) and the other to the PCMs wire. When cold, and it should be using the GPs, you should see 12v flowing through the meter (make sure it's in DC, test it first across the batteries terminals). Depending on how cold it is you should see that power there for from 30-120secs
Instead of "jumping" the relay, next time just ground the sm terminal on the GPR that the PCM wire was connected to (with the other, 12v, sm wire connected). You should feel/hear that relay throw and activate the plugs...