I have an 05 GC with 3.3 that turns over but won't start. I have replaced coil, crankshaft position sensor, cam position sensor and still not firing at all. It started skipping, the center coil was not firing, replaced coil pack no change, replaced crank sensor then no start, replaced cam sensor still no start, put original crank sensor back in, still no start. Can someone help? I'm thinking either a wiring issue or the PCM, which is likely? Thanks

 

My first suspects would be the relay, or (more likely) the IPM. First probe the ASD relay at pin #87 to see if there's power there while cranking. If ok there, then check the #2 BR/WT wire at the ignition coil connector (or pin #3 of the C4 IPM connector) to see if power is getting there as well. If no power there, then it's likely to be the very common corroded IPM which causes so many problems in our vans. But if that wire has power, then you'll need to probe coil pins #1,3, and 4 to see if they're getting ground from the PCM.

 

Hi, Thanks for your help. I do have another question, What and where is the IPM connector.

 

IPM (Integrated Power Module) is your fuse box next to the battery. The connectors are on the bottom. Remove a couple of screws and it will rotate up so you can get at them.

 

Thanks a lot for that, I'll check it and advise of what I find.

 

I probed the pins as shown before. I have power at pin 87 ASD relay, I have power at pin 2 of the coil connector. I am not getting ground from pins 1, 3 &4 of the coil connector plug. What should I look for next?

 

I also pulled the IPM and inspected the bottom but did not find any corrosion.

 

I'd next check the BR/LB #3 crank position signal wire, to see if it's sending anything to the PCM. Although you would need a scope to properly check the square wave, somewhere around 300-500 mv on a multi-meter would tend to validate that the sensor signal is good.

 

I'll check that after work and report back. Thanks