Faulty Signal. Permanent Fault

Faulty signal. Permanent fault

Checking the transmission output speed sensor signal








- Ignition off
- Check the control module and transmission output speed sensor connectors. Check 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.
- Raise the car so that the drive wheels can rotate freely
- Engine idling
- Gear selector in position D
- Read off the transmission output speed signal.
Check that the speed increases with engine speed (RPM). If the speed is updated, the cause of the fault was loose connections in the control module or vehicle speed sensor (VSS) connectors.

Note! A diagnostic trouble code (DTC) may be stored in the ABS system when the rear wheels are stationary and the front wheels rotate. Erase any diagnostic trouble codes (DTCs) in the ABS system after completing fault-tracing.

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 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 power supply cable between terminal #2 on the white 2-pin transmission output speed sensor connector (control module side) and control module terminal #9. 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 terminal #1 on the white 2-pin transmission output speed sensor connector (control module side) and control module terminal #10. 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 disconnect the transmission connectors, see Transmission connectors, AW55-50/51SN Transmission Connectors
- To check or replace the transmission output speed sensor, see Replacing the speed sensor, AW55-50/51SN Removal and Replacement
- For information about signals, see Signal description. Transmission control module (TCM), AW55-50/51SN Signal Description.









Was a fault detected?

Yes - Verification

No - Fault-tracing information

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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.
- Raise the car so that the drive wheels are clear of the ground
- Start the engine and let it run at idle speed
- Shift gear selector to position D so that the drive wheels begin to rotate
- Read off the transmission speed.
Check that the speed is updated

Note! Diagnostic trouble codes (DTCs) may be stored in the ABS system when the rear wheels are stationary and the front wheels rotate. Erase any diagnostic trouble codes (DTCs) stored in the ABS system after fault-tracing.

Note! Ensure that the wheels are not rotating when the gear selector is moved.





Was 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 output speed sensor signal

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