Checking the Vehicle Speed Sensor (VSS) Signal
Signal too high
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 - Intermittent fault
No - Checking wiring and sensors
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Checking wiring and sensors
- Ignition off.
- Connect the breakout box.
Check cables between control module terminal #A57 (#A57) and terminal #A39 (#A39) and vehicle speed sensor (VSS) connector terminals #1 and #2 for a short-circuit to each other.
Check power supply cable between control module terminal #A57 (#A57) and vehicle speed sensor (VSS) terminal #1 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the cable between control module terminal #A39 (#A39) and vehicle speed sensor (VSS) terminal #2 for 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 #1 and #2 (control module side), the voltage should be 1-3 V below Ubat.
Remedy as necessary.
Other information:
- To connect the breakout box, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box.
- To disconnect the control module, see Transmission control module (TCM), replacing, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Service and Repair.
- To disconnect the transmission connector, see the relevant service procedure.
- To check or replace the vehicle speed sensor (VSS), see Transmission output speed sensor, replacing Transmission Output Speed Sensor, Replacing.
- For information about signals, see Signal description. Transmission control module (TCM), AW50/51 AWD, AW55-50/51SN 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 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 FAILEDPAPER
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VERIFIED - Fault Found
VERIFICATION FAILED - Fault-tracing information
PAPER - No Fault Found
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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 - FAULT-TRACING FAILED
No - Attempt New Test
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FAULT-TRACING FAILED - FAULT-TRACING FAILED
Attempt New Test - Checking the vehicle speed sensor (VSS) signal
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Intermittent fault
- Ignition off.
Check the control module and transmission connectors for contact resistance and oxidation and remedy according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check power supply cable between control module terminal #A57 (#A57) and vehicle speed sensor (VSS) terminal #1 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 #A39 (#A39) and vehicle speed sensor (VSS) terminal #2 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, B5244T5, B5254T2 Connecting the Breakout Box.
- To disconnect the control module, see Transmission control module (TCM), replacing, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Service and Repair.
- To disconnect the transmission connector, see the relevant service procedure.
- For information about signals, see Signal description. Transmission control module (TCM), AW50/51 AWD, AW55-50/51SN 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 - Fault Found
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Attempt New Test - Checking the vehicle speed sensor (VSS) signal
FAULT FOUND - Fault Found
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