4L80E Troubleshooting

[rcamacho]

Working with the troubleshooting guide. Pulled codes, DTC 71 indicating crankshaft position sensor loss of signal.

Tested sensor, open circuit. Replaced sensor using known good and tested unit.

Repeated code 71…. Moving on to testing continuity of circuit 349 and 359 from the sensor to the TCM. Here’s where the real fun starts!

Supplement indicates pins H and P terminate circuits 349/359 respectively. Well, the cannon plug shows no terminated pins at these positions

Wonder if the body harness is incorrectly wired for this circuit or if the TM Supplement is incorrect on pin output.


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[Mogman]

Maybe it is the other P and H??
I count 37 holes, there are only 26 letters so I would assume some are repeated in lower case.
EDIT, it also looks like they do not use Q, O, or I
Sorry I can not be more help, I have never seen a 4L80E

 

[rcamacho]

Maybe it is the other P and H??
I count 37 holes, there are only 26 letters so I would assume some are repeated in lower case.
EDIT, it also looks like they do not use Q, O, or I
Sorry I can not be more help, I have never seen a 4L80E

Ah, very good call out. I did not realize there were lower case letter pins as well.

 

[Retiredwarhorses]

There are upper and lower case letters….

 

[rcamacho]

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