C121D

C121D-BRAKE PRESSURE SENSOR CIRCUIT

For a complete wiring diagram Refer to the Wiring Information.

- 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.





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.

1. Turn the ignition on.
2. With the scan tool, read and record DTCs.
3. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
4. With the scan tool, erase DTCs.
5. Start the engine.
6. Depress and release the brake pedal.
7. 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 . ABS Intermittent Condition Test

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.

1. Verify that the hydraulic system is properly filled and bleed the brake system.

Was a problem found?

Yes

- Repair as necessary.
- Perform ABS VERIFICATION TEST ABS Verification Test.

No

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