Signal Too High

Signal too high

Checking transmission speed sensor signal




- Ignition off.
- 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.
Depress the accelerator pedal (AP) and check that engine speed (RPM) 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 - Intermittent fault

No - Checking cables and sensors

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Checking cables and sensors




- Ignition off.
Check wiring between control module #A59 and #A41 and transmission connector #16 and #17 for a short-circuit each other.
Check power supply cable between control module #A59 and transmission connector #16 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check signal cable between control module #A41 and transmission connector #17 for an open-circuit or a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: With control module connected, ignition on and a voltmeter connected between transmission connectors #16 and #17 (control module side), the voltage should be approximately 8-12 V.

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 control module, see Replacing the gearbox control module (TCM) .
- To disconnect transmission connector, see Inspecting/cable harness to solenoids .
- To check/replace speed (RPM) sensor, see Replacing transmission speed sensor .
- 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.
- 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

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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 transmission speed sensor signal

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Intermittent fault




- Ignition off.
Check control module and transmission connectors for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check power supply cable between control module #A59 and transmission connector #16 for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check signal cable between control module #A41 and transmission connector #17 for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
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 control module, see Replacing the gearbox control module (TCM) .
- To disconnect transmission connector, see Inspecting/cable harness to solenoids .
- To check/replace speed (RPM) sensor, see Replacing transmission speed sensor .
- For information about signals, see Signal specification, Transmission control module (TCM) Signal Description AW50-42.













Continue - Diagnostic trouble code (DTC) information

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Diagnostic trouble code (DTC) information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - FAULT FOUND

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Attempt New Test - Checking transmission speed sensor signal

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