Auto shutdown issue
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So you're testing at the ASD relay, correct? I had a look at the wiring diagram:
For our info, are you using a DMM or a test light? It looks like, KOEO, you should have voltage at pins 86 and 87 of the ASD relay socket. If Fuse #16 is good, but you don't have voltage on either of those pins, then that would suggest an open wire or a pin issue inside the IPM. You COULD jump between pins 87 and 30, but only if you're absolutely positive that you're jumping the correct pins, and that pin 87 actually has power like it should. I'd suggest waiting on jumping the relay until we have a better understanding of what's missing for the relay to work.
You've checked all pins at the TPS, and didn't find anything? That would suggest that the PCM isn't working, as it's the source of the 5V reference that the TPS uses to create signal.
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Mort wrote: Thanks for the quick reply. Ya I pulled 16 and have continuity between the negative side and 87 but nothing on 86 which has me stumped
Really? :huh: That's pretty much down to an IPM issue, then. Or the wiring/connections in it, anyway. You could verify this with a test light connected to B- on pins 86 and 87. If one lights but the other doesn't, then you've found the problem.
You could also partially install the relay (with the pins exposed), and connect your test light to B+. Touch on pin 86 and see if the relay now operates during cranking.
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There Is No Such Thing As A Stupid Question, If It's Sincere. Better To Ask And Risk Appearing Stupid Than To Continue On Your Own Ignorant Way And Make A Stupid Mistake. Author Confidential/Unknown
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Mort wrote: Thanks for the quick reply. Ya I pulled 16 and have continuity between the negative side and 87 but nothing on 86 which has me stumped I flipped up the Ipm to see if any wires were broken and they were ok. This is the van that had the wiring in the wheel well ripped up by the blown tire. I thought the TPS got energized through the ASD relay I'll recheck the TPS and get back with you.
Yeah Mort, I agree with Tyler. Continuity test are ok but I prefer a voltage check on most circuits. I have seen some continuity test show good only to prove themselves wrong. Good Luck
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Mort wrote: I have checked voltage at both 86 and 87 no voltage at 86 I haven't removed any of the plugs going into the IPM if I unplug everything wouldn't that isolate the problem to the IPM. I repaired all of the wiring in the wheelwell and that gave me back the power in the cab.
I think you've pretty well isolated the issue to the IPM itself, as the wires that go from Fuse #16 to the ASD relay socket don't leave the IPM (according to the diagram, anyway).
If you can use your test light to provide power to pin 86 and the ASD relay works, then I'd consider either taking the IPM apart and finding that splice like Euro Joe suggested, or replacing it.
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Again, looked up the diagram for reference:
Now, at this point I feel it necessary to point out that a problem with the transmission control relay won't cause a no start. Don't get me wrong - I'm totally happy to help you chase down this relay issue! But if the engine isn't starting, then I think we need to back up and attack this from another direction.
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How's spark and injection pulse? That'd be the place to start. Or, at least power to the ignition coil and injectors during cranking. If you have both, then you can add carb clean to the intake and see if it'll start/run.
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Thanks
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I say stay with the lack of power at the ignition coil. Back up that reading with a voltage check at pin 1 at C102 of the fuel injector harness during cranking:
If you still have no power, then we need to go back to the ASD relay. If we're sure the ASD relay is working, then we can trace a wiring problem in between.
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If you still don't see a ground at relay pin 85 during cranking, then absolutely, go to pin 67 of C2 and recheck during cranking.
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I'm thinking that following the ASD issue will bring us back around to the sensor readings you're getting.
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