Signal Missing. Permanent Fault

Signal missing. Permanent fault

Checking control module and wheel sensor connector








- Ignition off.
- Check wheel sensor and ABS control module connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Reinstall components, reconnect connectors etc.
- Raise car so the relevant wheel is clear of ground.
- Ignition on.
- Read off wheel speed for relevant wheel.
Spin the relevant wheel and check that wheel speed is updated.
If the wheel speed is updated, the cause of the fault was loose connections in the control module or wheel sensor connector.

Other information:
- To disconnect wheel sensor connector, see Front wheel sensor, replacement Front Wheel Sensor, Replacement.
- To disconnect ABS control module connector, see Replacing the control module Service and Repair.





Is wheel speed updated?

Yes - FAULT FOUND

No - Checking cables and sensors

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Checking cables and sensors
Check wiring for power supply between wheel sensor connector:

Diagnostic trouble code (DTC) ABS-0010 Left front wheel sensor
#1 and control module #2

Diagnostic trouble code (DTC) ABS-0020 Right front wheel sensor
#1 and control module #20
for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: With the ignition on, voltage should be approximately 1 V below Ubat measured on the ground terminal.

Check signal cables between wheel sensor connector:

Diagnostic trouble code (DTC) ABS-0010 Left front wheel sensor
#2 and control module #1

Diagnostic trouble code (DTC) ABS-0020 Right front wheel sensor
#2 and control module #19
for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check sensor (with the sensor connected) by switching on ignition and measuring signal from sensor between breakout box:

Diagnostic trouble code (DTC) ABS-0010 Left front wheel sensor
#1 and ground terminal.

Diagnostic trouble code (DTC) ABS-0020 Right front wheel sensor
#19 and ground terminal.
Voltage should vary approximately 1 V when the pulse wheel is rotating. Replace wheel sensor if voltage is faulty.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the ABS breakout box Connecting the ABS Breakout Box.
- To replace the wheel sensor, see Front wheel sensor, replacement Front Wheel Sensor, Replacement.
- To disconnect control module, see Replacing the control module Service and Repair.
- For other values, see Signal specification, ABS control module Signal Specification, ABS Control Module.









Select Continue when the fault has been remedied.

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 the relevant wheel is clear of ground.
- Ignition on.
- Read off wheel speed for relevant wheel.
Spin the relevant wheel and check that wheel speed is updated.





Is the wheel 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 control module and wheel sensor connector

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