4000 - 4999: 4921

4921-SWITCH OVER VALVE CONTROL CIRCUIT HIGH

- 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 4921-SWITCH OVER VALVE CONTROL CIRCUIT HIGH
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: 4921-SWITCH OVER VALVE CONTROL CIRCUIT HIGH?

Yes

- Go To 2

No

- Perform ABS VERIFICATION TEST. Verification Tests.

2. RECHECK FOR A DTC 4921-SWITCH OVER VALVE CONTROL CIRCUIT HIGH
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 firmly and release the brake pedal.
With the scan tool, read and record DTCs.
Does the scan tool display: 4921-SWITCH OVER VALVE CONTROL CIRCUIT HIGH?

Yes

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

No

- Test complete