Faulty Signal. Permanent Fault

Faulty signal. Permanent fault

Checking the transmission input speed sensor signal








- Ignition off
- Check the transmission control module (TCM) and transmission connectors. Check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Remedy if necessary
- Reinstall the components, reconnect the connectors etc.
- 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 input speed is updated.
Compare with the engine speed (RPM).
If the transmission speed increases, the cause of the fault was loose connections in the control module or transmission speed sensor connectors.

Other information:
- 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
- For information about signals, see Signal description. Transmission control module (TCM), AW55-50/51SN Signal Description.





Does the transmission input speed increase with engine speed (RPM)?

Yes - FAULT FOUND

No - Checking wiring and sensors

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Checking wiring and sensors




- Ignition off
- Connect the breakout box.
Check the speed sensor cable for power supply between control module terminal #11 and terminal #2 on the black 2-pin transmission connector (control module side). Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the signal cable between control module terminal #12 and terminal #1 on the black 2-pin transmission connector (control module side). Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for a short-circuit to supply voltage 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 replace the cable harness for the solenoids, see Replacing the cable harness for the control system, 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.













Was a fault detected?

Yes - Verification

No - No Fault Found

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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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