Faulty Signal. Permanent Fault

Faulty signal. Permanent fault

Checking the transmission speed sensor signal








- Ignition off.
- Remedy the control module and transmission speed sensor connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Reinstall the components, reconnect the connectors etc.
- 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).
If the transmission speed increases, the cause of the fault was loose connections in the control module or transmission speed sensor connectors.





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

Yes - FAULT FOUND

No - Checking wiring and sensors

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Checking wiring and sensors
Check transmission speed sensor cable for power supply between control module #A59 (#A59) and transmission connector #16 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: With the control module connected and the ignition on, the voltage between vehicle speed sensor connector #1 and #2 should be approximately 3 V below Ubat.

Check the signal cable between control module #A41 (#A41) and transmission connector #17 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and 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, B5234T9, B5244T7 Connecting The Breakout Box.
- To disconnect the automatic transmission connector, see Replacement Of Control System Cable Harness With Oil Temperature Sensor.
- To replace the 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.













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 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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