Faulty Signal. Permanent Fault

Faulty signal. Permanent fault

Checking pump motor function








- Ignition off.
- Check control module and pump motor connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Reconnect components, connectors etc.
- Ignition on.
- Activate pump motor.
Check that the pump motor starts and operates normally.
If the pump motor starts and seems to operate normally the cause of the fault was contact resistance and oxidation in the control module or pump motor connectors.

Other information:
- To disconnect control module and pump motor, see Replacing the control module Service and Repair.





Is the pump function OK?

Yes - Fault has been remedied

No - Checking wiring and components

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Checking wiring and components
Check wiring between control module #25 and battery for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check that fuse 4 in the integrated relay/fusebox in the engine compartment is intact. If the fuse is blown, check cable between fuse and control module #25 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and then replace fuse.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the ABS breakout box Connecting the ABS Breakout Box.













Was a fault detected?

Yes - Verification

No - Checking pump motor circuit

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Checking pump motor circuit
- Ignition off.
- Connect an ohmmeter between pump motor connector #2 and ground.
The ohmmeter should read infinite resistance.









Was resistance OK?

OK - Checking pump motor

Not OK - Checking for a short-circuit and replacing component

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Checking for a short-circuit and replacing component
Check cable between pump motor and pump motor connector for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If the cable is OK try a new ABS hydraulic modulator according to Hydraulic unit, replacing Removal and Replacement.





Select Continue when the fault has been remedied.

Continue - Verification

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Checking pump motor








Temporarily connect an unfused cable between pump motor connector:
- #2 and battery positive terminal
- #1 and battery negative terminal.
When the cable is connected to the battery the motor should start. Run for a maximum of 10 seconds.
Remove temporary cables.





Does the pump motor start and operate normally?

Yes - Checking pump motor

No - Checking for an open-circuit in the cable

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Checking for an open-circuit in the cable
Check wiring between pump motor connector and pump motor for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If the wiring is OK try a new ABS hydraulic modulator according to Hydraulic unit, replacing Removal and Replacement.





Select Continue when the fault has been remedied.

Continue - Verification

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Checking pump motor








- Ignition off.
- Connect pump motor connector.
- Ignition on.
- Activate pump motor.
Check that the pump motor starts and operates normally.





Is the pump function OK?

Yes - Checking contact resistance and oxidation

No - Replacing component

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Checking contact resistance and oxidation
The cause of the fault has been loose connections in the pump motor or control module connectors.
Remedy control module and pump motor connector according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.





Continue - Verification

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Replacing component
Try a new control module according to Replacing the control module Service and Repair.

Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.




- Ignition on.
- Activate pump motor.
Check that the pump motor starts and operates normally.





Does the pump motor start and operate normally?

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 pump motor function

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