Signal Outside Its Permitted Range

Signal outside its permitted range

Checking the connectors








- Ignition off
- Check the brake control module (BCM) and pedal pressure sensor connectors. Check for contact resistance and oxidation
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Read off the status of the pedal pressure sensor.
The status must be OFF with the brake pedal unaffected and change to ON when the brake pedal is pressed. If the status changes, the cause of the fault was probably contact resistance or oxidation in the control module or in the pedal pressure sensor connectors.









Does the status change?

Yes - Fault Found

No - Checking the wiring

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Checking the wiring
Check the wiring between the pedal pressure sensor:
- terminal #1 and control module terminal #27 (#A27)
- terminal #2 and control module terminal #30 (#A30)
- terminal #5 and control module terminal #28 (#A28).
check for an open-circuit, a short-circuit to ground and a short-circuit to supply voltage.
Remedy as necessary.

Other information
- To connect the breakout box, see Connecting the breakout box, brake control module (BCM) Connecting the Breakout Box, Brake Control Module (BCM)
- To fault-trace the wiring and connections, see Checking wiring and terminals Checking Wiring And Terminals
- To replace the pedal pressure sensor (power brake booster), see Power brake booster, replacing Power Brake Booster, Replacing
- For information about signals, see Signal specification, brake control module (BCM) with DSTC (dynamic stability and traction control) Signal Specification.













Was a fault detected?

Yes - Verification

No - Checking the connectors

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Checking the connectors




- Ignition off
- Connect the breakout box to the cable harness (not control module side).
Connect an ohmmeter between terminals #28 and #27 on the breakout box. When the brake pedal is not depressed the resistance must be infinite. When the brake pedal is depressed the resistance must be 0 ohms.
Connect an ohmmeter between terminals #28 and #30 on the breakout box. When the brake pedal is not depressed the resistance should be 0 ohms. When the brake pedal is depressed the resistance should be infinite.
Replace the power brake booster if the resistance is incorrect.

Other information
- To connect the breakout box, see Connecting the breakout box, brake control module (BCM) Connecting the Breakout Box, Brake Control Module (BCM)
- To replace the power brake booster, see Power brake booster, replacing Power Brake Booster, Replacing.













Was the resistance OK?

Yes - No Fault Found

No - Verification

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Verification




Verification

Verification

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








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Test drive the car. See Test Drive Form (DSTC (dynamic stability and traction control) /brake control module), description Test Drive Form (DSTC (Dynamic Stability And Traction Control) /Brake Control Module), Description
- Ignition on.
Read off the status of the diagnostic trouble code (DTC).





Is the status of the diagnostic trouble code (DTC) intermittent?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

PAPER - No Fault Found

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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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