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Stalled then no crank

Tiny
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Yes, that is the wire were are concerned about.

Roy
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Thursday, November 1st, 2018 AT 4:08 PM
Tiny
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Okay. Thanks Roy! I will update you tomorrow! Time for beer!
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Thursday, November 1st, 2018 AT 4:16 PM
Tiny
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Sounds like a plan.

Keep us updated.

Roy
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Thursday, November 1st, 2018 AT 4:17 PM
Tiny
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Hey Roy - apologize for the gap in reporting back. A buddy of mine thought the guys at his shop could find the issue quickly. Not only was it not quick, they also have not found the issue other than to say I'm getting back feed to pin 85 on the relay.
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Sunday, November 25th, 2018 AT 9:36 AM
Tiny
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It sounds like your buddies shop has no idea what they are doing.

Pin 85 gets its power from the park neutral switch when in the start position. That is what is supposed to happen. 86 is the ground side of the relay. The PCM grounds the relay so the solenoid will get power.

You need a real shop with a real tech that can do proper diagnostic checks. This is a simple check by a tech.

Roy
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Sunday, November 25th, 2018 AT 9:44 AM
Tiny
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Thanks and I agree. So I am back to working on it myself. I love the challenge and learning so I am going to continue to trouble shoot it, hopefully with your help. So I will let you know where I am in the hunt.
12+ Volts at PIN 30 always
0 Volts at PIN 87
In off position PINs 86/85 have about 1/2 a volt
In run position PINs 86/85 have 8+ volts

So is the pink wire to PIN 86 the one I need to trace since it seems I'm getting no ground there?
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Sunday, November 25th, 2018 AT 9:59 AM
Tiny
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85 should have power in the start position. 86 goes to the pcm and the pcm grounds that wire to energize the relay. 87 will be hot when the relay is energized.

Roy
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Sunday, November 25th, 2018 AT 10:09 AM
Tiny
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Okay, so based on that we can conclude that because I have 8+ volts at 85 in start the TN/RD from TRS is okay, but the PNK from PCM to 86 may have issue or the PCM itself?
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Sunday, November 25th, 2018 AT 10:14 AM
Tiny
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No, you should have battery voltage to 85 not 8 volts. Check the incoming wire from the fuse block to the trs for battery voltage in the start position.

Roy
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Sunday, November 25th, 2018 AT 10:16 AM
Tiny
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Okay, I have 12+ on the BN/PK from fuse block at start. TN/RD at the TRS does not go higher than 8+ volts.
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Sunday, November 25th, 2018 AT 10:27 AM
Tiny
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Not sure if this tells you anything or not but I noticed in the diagram that theres a jumper from 85 to the audio system fuse in the BJB. The radio does not work when key is in the on position while the 5amp fuse is in place. If I remove that fuse the radio works. Could be a rabbit hole but just wanted to point out everything I can in this system.
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Sunday, November 25th, 2018 AT 10:32 AM
Tiny
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You could try unplugging the radio and see if it makes a difference but 8 volts is not enough. The TRS may be the issue.

Roy
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Sunday, November 25th, 2018 AT 10:38 AM
Tiny
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I also replaced the TRS with a new one. Same readings.
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Sunday, November 25th, 2018 AT 10:40 AM
Tiny
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Okay, I will go unhook the radio.
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Sunday, November 25th, 2018 AT 10:40 AM
Tiny
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Sounds like a plan.
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Sunday, November 25th, 2018 AT 10:41 AM
Tiny
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Okay, unplugged the radio harness. Same readings.
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Sunday, November 25th, 2018 AT 10:53 AM
Tiny
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Seems something is pulling the 4 volts off of the TN/RD since the infeed is giving 12+. SMH.
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Sunday, November 25th, 2018 AT 10:55 AM
Tiny
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I figured that. Verify the input to the TRS is the same reading as at the fuse block.

Roy
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Sunday, November 25th, 2018 AT 11:00 AM
Tiny
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Okay checked, we have matching 12+ volts at SJB and TRS input (PIN10/ BN/PK) on TRS.
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Sunday, November 25th, 2018 AT 11:10 AM
Tiny
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Okay. Either it is out of adjustment or the new switch is no good.
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Sunday, November 25th, 2018 AT 11:17 AM

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