Signal Missing. Permanent Fault

Signal missing. Permanent fault

Checking the vehicle speed sensor (VSS) signal




- Ignition off.
- Raise the car so that the drive wheels are clear of the ground.
- Start the engine and let it idle.
- Shift the gear selector to position D so that the drive wheels begin to rotate.
- Read off the transmission speed.
Depress the accelerator pedal (AP) and check that the speed is updated.

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

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.





Was the speed updated?

Yes - No Fault Found

No - Checking wiring and sensors

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Checking wiring and sensors




- Ignition off.
Check the power supply cable between transmission control module (TCM) terminal 57A and vehicle speed sensor (VSS) connector terminal 1 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) terminal 39A and vehicle speed sensor (VSS) connector terminal 2 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: With the control module connected, the ignition on and a voltmeter connected between vehicle speed sensor (VSS) connector terminals 1 and 2 (control module side), the voltage should be approximately 1 V under Ubat.

Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting breakout box, Transmission control module (TCM) Connecting Breakout Box, Transmission Control Module (TCM).
- To disconnect the transmission control module (TCM), see Replacing the gearbox control module (TCM) .
- To check / replace the vehicle speed sensor (VSS), see Replacing vehicle speed sensor (VSS) .
- For information about signals, see Signal specification, Transmission control module (TCM) 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 connectors, components etc.
- Raise car so that drive wheels are unimpeded.
- Start the engine and let it idle.
- Shift gear selector to position D so that the drive wheels begin to rotate.
- Read off the transmission speed.
Check that speed is updated

Note! When the rear wheels are stationary and the front wheels rotate, diagnostic trouble codes (DTCs) can be stored in the ABS system. 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 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 vehicle speed sensor (VSS) signal

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