Signal Missing. Permanent Fault

Signal missing. Permanent fault

Checking the transmission speed sensor signal




- Move the gear selector to position P.
- Start the engine and let it idle.
- Read off the transmission 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 control module (TCM) and speed sensor connectors 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) #A59 (#A59)and transmission connector A #16 for an 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) #A41 (#A41) and transmission connector A #17 for an intermittent open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: With the transmission control module connected, the ignition on and a voltmeter connected between transmission connectors #16 and #17 (control module side), the voltage should be approximately 3 V below Ubat.

Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box, B5234T9, B5244T7 Connecting The Breakout Box.
- To disconnect the transmission control module (TCM), see Replacing the gearbox control module (TCM) Replacing the Gearbox Control Module (TCM).
- To disconnect transmission connector A, see Replacement Of Control System Cable Harness With Oil Temperature Sensor.
- To replace the transmission speed sensor, see Replacing transmission speed sensor.
- For information about signals, see Signal description. Transmission control module (TCM), AW55-50/51SN Signal Description AW50-42.














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 idle.
- Gear selector in position P.
- Read off the transmission 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 speed sensor signal

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