Signal Outside Its Permitted Range

Signal outside its permitted range

Checking the connectors




- Ignition off
- Check the connectors of the brake control module (BCM) and the pressure build-up valve/pedal pressure sensor for contact resistance and oxidation.
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Use the Activation function to activate the pressure build-up valve.
A mechanical pumping sound should be audible from the engine compartment and the pedal should move slightly.

Other information
- For removal of the control module connectors: Connecting the breakout box, brake control module (BCM) Connecting the Breakout Box, Brake Control Module (BCM)
- Checking wiring and terminals Checking Wiring And Terminals









Was the function OK?

Yes - Fault Found

No - Checking wiring and sensors

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Checking wiring and sensors
Check the cables between the pressure build-up valve:
- #3 and brake control module (BCM) #31 (#A31)
- #4 and brake control module (BCM) #17 (#A17)
check for an open-circuit, a short-circuit to ground and a short-circuit to supply voltage.

Hint: Check the pressure build-up valve by, with the ignition off and the breakout box connected, reading the resistance between terminals #17 and #31 on the breakout box. Resistance must be approximately 3ohms.

Remedy as necessary.

Other information
- Connecting the breakout box, brake control module (BCM) Connecting the Breakout Box, Brake Control Module (BCM)
- For replacing the pressure build-up valve (brake booster): Power brake booster, replacing Power Brake Booster, Replacing





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
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Use the Activation function to activate the pressure build-up valve.
A mechanical pumping sound should be audible from the engine compartment and the pedal should move slightly.









Was the function OK?

Yes - Fault Found

No - 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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the connectors

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