ztoy

Hi All.

I've mostly finished stripping the loom of all the unneeded bits and tidying up all the wiring. One thing I have noticed is that there is no obvious starter/cranking wire to let the PCM know when I'm trying to start the engine.

Is there meant to be one or does the PCM have some other smarts for it to figure out the engine is cranking over?

My fear is that it is sent from the BCM via the serial data wire.

The PCM and Loom are from a VY SS commodore 2002-04

lsxRanger94

Big purple wire in the loom goes to the starter solenoid. When PCM sees crank signal from the crankshaft position sensor it knows you are trying to start and run.

ztoy

Thanks.

My loom is good to go

mattcrp1

Same on the purple wire. Both my donor engine, 2002 Silverado, and my swap vehicle,1976 c10 had the purple starter wire. Hooked right up and starts from the key

ztoy

I actually don't have the purple wire on mine anymore as I'm using a Nissan gearbox and starter, My gearbox and starter have their own loom with the starter solenoid wire in it.

As long as the PCM can tell when im attempting to starting from the CPS she will be fine

76larkman

I don't have that wire in my skylark anymore I took out of truck harness. It starts fine using one the car came with.