C121D

C121D-BRAKE PRESSURE SENSOR CIRCUIT

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the ignition on.

- Set Condition:
When the Anti-Lock Brake Module indicates that the Brake Pressure Sensor Signal is out of range.





Diagnostic Test

1. CHECK FOR A DTC C121D-BRAKE PRESSURE SENSOR CIRCUIT
NOTE: This DTC must be active for the results of this test to be valid.

Turn the ignition on.
With the scan tool, read and record DTCs.
With the scan tool, read and record Freeze Frame information.
With the scan tool, erase DTCs.
Start the engine.
Depress and release the brake pedal.
With the scan tool, read and record DTCs.
Does the scan tool display: C121D-BRAKE PRESSURE SENSOR CIRCUIT?

Yes

- Go To 2

No

- Perform the ABS Intermittent Condition diagnostic procedure. Component Tests and General Diagnostics

2. CHECK FOR AIR IN BRAKE SYSTEM AND WORN MECHANICAL COMPONENTS

NOTE: Before continuing the brake system must be bled to verify there is no air in the brake system.

NOTE: Visually inspect for worn brake linings, undersized rotors, binding or frozen calipers. Repair as necessary.

If no problem was found above replace the Anti-Lock Brake Module. Perform ABS VERIFICATION TEST. ABS Verification Test

Continue

- Go to 3

3. RECHECK FOR A DTC C121D-BRAKE PRESSURE SENSOR CIRCUIT
Turn the ignition on.
With the scan tool, read and record DTCs.
With the scan tool, read and record Freeze Frame information.
With the scan tool, erase DTCs.
Start the engine.
Depress and release the brake pedal.
With the scan tool, read and record DTCs.
Does the scan tool display: C121D-BRAKE PRESSURE SENSOR CIRCUIT?

Yes

- Replace the ICU.
- Perform ABS VERIFICATION TEST. ABS Verification Test

No

- Test complete