Faulty Signal

Faulty signal

Checking the connectors




- Ignition off
- Check the connectors for the brake control module (BCM) and pedal position sensor. Check for contact resistance. Check for oxidation
- Reinstall the components, connectors, etc.
- Connect the breakout box to the brake control module (BCM)
- Ignition on
- Read off the position and speed of the pedal position sensor.
Press down the brake pedal and check that the signals are updated.
The signal for the pedal position sensor must increase as the brake pedal is pressed further.
Press the brake pedal at different speeds. Check that the speed signal is updated.

Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Brake Control Module (BCM)
- Checking wiring and terminals Checking Wiring and Terminals









Was the signal updated?

Yes - FAULT FOUND

No - Checking the wiring and sensors

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Checking the wiring and sensors




- Ignition off.
Check the wiring between pedal position sensor
- terminal #1 and brake control module (BCM) terminal #22 (#A22)
- terminal #2 and brake control module (BCM) terminal #21 (#A21)
- terminal #3 and brake control module (BCM) terminal #3 (#A3).
Check for an open-circuit, a short-circuit to ground and a short-circuit to supply voltage.
Check the pedal position sensor as follows
- ignition off,
- breakout box connected to the wiring,
- brake control module (BCM) disconnected.
measure the resistance at the pedal position sensor.
The resistance between terminals #3 (#A3) and #21 (#A21) must be approximately 0.5 kohms when the brake pedal is unaffected. The resistance must increase when the brake pedal is pressed.
The resistance between terminals #3 (#A3) and #22 (#A22 must be approximately 2.5 kohms when the brake pedal is unaffected. The resistance must decrease when the brake pedal is pressed.
Remedy as necessary.

Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Brake Control Module (BCM)
- Position sensor, brake pedal Service and Repair
- Signal description with ABS/STC, B5254T7 Signal Description With ABS/STC Signal description with DSTC, B5254T7 Signal Description With DSTC
- Checking wiring and terminals Checking Wiring and Terminals









Was a fault detected?

Yes - Verification

No - Fault-tracing information

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Verification

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








- Ignition off
- Reinstall the components, connectors, etc.
- Ignition on
- Read off the signal from the pedal position sensor.
Depress the accelerator pedal (AP). Check that the signal is updated.
The signal must increase as the brake pedal is pressed further. Depress the accelerator pedal (AP) at different speeds. Check that the signal is updated.





Was the signal updated?

Yes - FAULT FOUND

No - Fault-tracing information

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Fault-tracing information

Attempt New Test - Checking the connectors

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Information

Fault-tracing information
The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.
Complete the fault-tracing for those fault or try again.

Do you want to terminate fault-tracing at this time?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking the connectors

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