Shift Problems

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Shift Problems

Postby Cruzer » 13 May 2015, 11:17

Just checked in to a new unit and a couple vehicles are down due to not shifting. I've replaced (M1152) TCM, TISS/TOSS, pressed the reset button. I hook a supershifter into the TCM to manually shift and shifts without a problem. I Diagnosed with the Supershifter but no codes pull. Any ideas as to what it can be? The transmission light does illuminate.
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Re: Shift Problems

Postby SgtCathers » 14 May 2015, 16:35

Does your transmission light come on at all? If not pull the wires out of the reset button and plug them together if the light comes on the circuit breaker is bad.Also check your Throttle Position Sensor, if it is out of adjustment will prevent from shifting. One thing I would also check, it's amazing but I've seen it, the tiss and toss wires to make sure they are not switched around.
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Re: Shift Problems

Postby Cruzer » 15 May 2015, 10:28

Transmission light does illuminate. I'm getting 12V to the reset button wires. I can't image the tiss/toss wires were switched around but anything is possible in this case. I'll follow up with an update if or when I figure it out.
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Re: Shift Problems

Postby Petz » 01 Jul 2015, 12:20

Check the fuel line on the back of the engine leading into the fuel water seperator. If the engine was replaced there is a good chance they didn't cut it down to size and the fuel is being restricted at higher RPMs. This will cause the vehicle to seem as though it's not shifting.

The way to test this is by slowly bringing the vehicle to Wide Open Throttle (WOT). If the engine begins to sputter then it's a fuel problem.

Note** I've had issues further down the fuel supply line that have caused the same issue. There is a one way check valve in-line on the fuel feed that had a small plastic burr stuck in it causing the same issue as the above mentioned issue.
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