Signal Missing. Permanent Fault

Signal missing. Permanent fault

Checking the transmission speed sensor 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.
Check that the transmission 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.





Is the speed updated?

Yes - No Fault Found

No - Checking wiring and sensors

-------------------------------------------------

Checking wiring and sensors




- Ignition off.
Check the Transmission control module (TCM) and the speed sensor's connectors for contact resistance and oxidation. Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
Check the power supply cable between transmission control module (TCM) terminal A59 and transmission connector terminal 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) terminal A41 and transmission connector terminal 17 for an 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 connector terminals 16 and 17 (control module side), the voltage should be approximately 1 V below 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 disconnect transmission connector, see Inspecting/cable harness to solenoids .
- For information about signals, see Signal specification, Transmission control module (TCM) Signal Description AW50-42.













Continue - Verification

-------------------------------------------------

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.
- Gear selector in position D so the front wheels start to rotate.
- Read off the transmission speed.
Depress the accelerator pedal (AP) and check that engine speed (RPM) is updated





Is engine speed (RPM) updated?

Yes - VERIFIED

No - VERIFICATION FAILED

------------------------

VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

-------------------------------------------------

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

------------------------

Attempt New Test - Checking the transmission speed sensor signal

-------------------------------------------------