Signal Missing. Permanent Fault

Signal missing. Permanent fault

Checking the transmission input speed sensor signal




- Gear selector in position P
- Start the engine and let it run at idle speed
- Read off the transmission input speed.
Check that the transmission speed is updated.
Compare with the engine speed (RPM).





Is the speed updated?

Yes - No Fault Found

No - Checking wiring and sensors

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Checking wiring and sensors




- Ignition off.
Check the transmission connector. Check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the power supply cable between transmission control module (TCM) terminal #11 and terminal #2 on the black 2-pin transmission connector (control module side). Check for an intermittent open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the signal cable between transmission control module (TCM) terminal #12 and terminal #1 on the black 2-pin transmission connector. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box, AW55-50/51SN Connecting The Breakout Box
- To disconnect the transmission control module (TCM), see Replacing the transmission control module (TCM), AW55-50/51SN Service and Repair
- To disconnect the transmission connectors, see Transmission connectors, AW55-50/51SN Transmission Connectors
- To replace the transmission input speed sensor, see Replacing the engine speed (RPM) sensor, AW55-50/51SN Service and Repair
- For information about signals, see Signal description. Transmission control module (TCM), AW55-50/51SN Signal Description.














Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Start the engine and let it run at idle speed
- Gear selector in position P
- Read off the transmission input speed.
Depress the accelerator pedal (AP) and check that engine speed (RPM) is updated.
Compare with the engine speed (RPM).





Is the speed updated?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking the transmission input speed sensor signal

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