Fault-Tracing Information

Fault-tracing

Checking the operation of the pump motor




- Ignition on.
- Activate the pump motor.
Check that the pump motor starts and operates normally.
The fault is permanent if the function is faulty.
The fault is intermittent if the function is OK.
Check the fuse for the brake system in the integrated relay / fuse box in the engine compartment. Has the fuse blown? If the fuse is blown, check the circuit after the fuse before replacing the fuse. Check for a short-circuit to ground.
Check the circuit for pump motor between Brake control module (BCM) and the fuse in the engine compartment for open circuit.
Check the ground lead between the control module and the ground terminal. Check for an open-circuit.
If no defect is found, replace hydraulic unit.

Other information
- Connecting the breakout box Connecting the Breakout Box, Brake Control Module (BCM)
- Checking wiring and terminals Checking Wiring and Terminals









Was a fault detected?

Yes - Verification

No - No Fault Found

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Verification

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




- Ignition off.
- Restore components and connectors.
- Ignition on.
- Activate the pump motor.
Check that the pump motor starts and operates normally.









Was the function OK?

Yes - FAULT FOUND

No - Fault-tracing information

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Fault-tracing information

Attempt New Test - Checking the operation of the pump motor

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