Faulty Signal
Faulty signal
Query
Question
Does the car have a DSTC system?
Yes - DSTC
No - STC
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STC - Checking the connectors and cables
DSTC - DSTC
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Checking the connectors and cables
Check the relevant 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.
Check the connectors and wiring insulation for damage.
Check that the wheel sensor cables are not too close to sources of interference.
Remedy as necessary.
Other information
- To connect the breakout box, see Connecting the ABS breakout box Connecting the Breakout Box
- To disconnect the control module connector, see Control module (ABS), replacing Control Module (ABS), Replacing
- To check and replace the wheel sensors, see Wheel sensor, front, replacing Wheel Sensor, Front, Replacing
- For information about signals, see Signal specification, ABS control module Signal Specification, ABS Control Module.
Was a fault detected?
Yes - Verification
No - Procedure complete
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Verification
Hint: After the repair it is necessary to check that the fault has been rectified.
- Ignition off.
- Connect the connectors, install the components, etc.
- Ignition on.
- Check that the ABS warning lamp comes on and goes out after approximately 2 seconds. If the lamp does not go out, the fault is still present.
- Test-drive the car as described in Test Drive Form (ABS), description Test Drive Form (ABS), Description.
Check the ABS warning lamp during the test-drive. If the warning lamp comes on, return to the workshop and read off the diagnostic trouble codes.
Does the lamp go out and stay out?
Yes - Verification completed
No - Fault-tracing information
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Fault-tracing information
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 connectors and cables
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DSTC
Signal faulty
Checking connectors and wires
Check the connectors of the ABS control unit and the relevant wheel sensor for contact resistance and oxidation, as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check connectors and wiring insulation for damage.
Check that the wheel sensor wires are not in close proximity to any source of interference.
Do the necessary corrective action.
Additional information
- To connect the test box, see Connecting the ABS/DSTC breakout box Connecting the Breakout Box.
- To disconnect control unit connector see Replacing the control module for ABS and dynamic stability and traction control (DSTC) Replacing the Control Module for ABS and Dynamic Stability and Traction Control (DSTC).
- To check/replace the wheel sensor, see Wheel sensor, front, replacing Wheel Sensor, Front, Replacing.
- For information on signals, see Signal specification, ABS / DSTC (dynamic stability and traction control) control module Signal Specification, ABS / DSTC (Dynamic Stability and Traction Control) Control Module.
Is there a fault?
Yes - Verification
No - Procedure complete
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Verification
Hint: After the repair it is necessary to check that the fault has been rectified.
- Ignition off.
- Connect the connectors, install the components, etc.
- Ignition on.
- Check that the ABS warning lamp lights and goes out after approximately 2 seconds. If the lamp does not go out, the fault has not been rectified.
- Test-drive the car as described in Test driving Test Driving.
Check the ABS warning lamp during the test drive. If the warning lamp lights, return to the workshop and read the diagnostic trouble codes.
Does the lamp go out and stay out?
Yes - Verification completed
No - Trouble-shooting information
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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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