Signal Too High

Signal too high

Checking the transmission input speed sensor signal




- Gear selector in position P
- Start the engine. Allow the engine to idle
- Read off the transmission input speed.
Depress the accelerator pedal (AP) and check that engine speed (RPM) is updated.





Is the speed updated?

Yes - Intermittent fault

No - Checking wiring and sensors

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Checking wiring and sensors




- Ignition off.
Check the cables between transmission control module (TCM) terminals #A59 (#A59) and #A41 (#A41) and transmission connector terminals #A2 and #A1. Check for a short-circuit to each other.
Check the power supply cable between control module terminal #A59 (#A59) and transmission connector terminal #A2. 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 control module terminal #A41 (#A41) and transmission connector terminal #A1. Check 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 the control module connected, the ignition on and a voltmeter connected between transmission connector terminals #A2 and #A1 (control module side), the voltage must be 1-3 V below Ubat.

Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box, B5254T2 Connecting the Test Box
- To disconnect the control module, see Transmission control module (TCM), replacing, B5254T2, AW50/51 AWD, B5254T2, AW55-50/51SN Service and Repair
- To disconnect the transmission connectors, see Connectors transmission, disconnecting / connecting
- To check or replace the transmission speed sensor, see Input speed sensor/output speed sensor, replacing Input Speed Sensor/Output Speed Sensor, Replacing
- For information about signals, see Signal description. Transmission control module (TCM), AW55-50/51SN, AW50/51 AWD Signal Description. Transmission Control Module (TCM).









Continue - Verification

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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 - Verification completed

No - 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 input speed sensor signal

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Intermittent fault




- Ignition off.
Check the transmission control module (TCM) and transmission connectors. Check for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the power supply cable between control module terminal #A59 (#A59) and transmission connector terminal #A2. Check for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the signal cable between control module terminal #A41 (#A41) and transmission connector terminal #A1. Check 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 the breakout box, B5254T2 Connecting the Test Box
- To disconnect the control module, see Transmission control module (TCM), replacing, B5254T2, AW50/51 AWD, B5254T2, AW55-50/51SN Service and Repair
- To disconnect the transmission connectors, see Connectors transmission, disconnecting / connecting
- To check or replace the speed sensor, see Input speed sensor/output speed sensor, replacing Input Speed Sensor/Output Speed Sensor, Replacing
- For information about signals see Signal description. Transmission control module (TCM), AW55-50/51SN, AW50/51 AWD Signal Description. Transmission Control Module (TCM).









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 - Exit fault-tracing

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Attempt New Test - Checking the transmission input speed sensor signal

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