C1246

C1246-1C-VACUUM PRESSURE SENSOR SUPPLY - CIRCUIT VOLTAGE





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Continuous

- Set Condition:
The Vacuum Sensor five volt supply voltage feedback indicates that the voltage level is less than 4.75 volts or greater than 5.25 volts for more than 50msec.





1. VERIFY THE DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, record and erase the DTCs.
3. Cycle the ignition switch from off to on.
4. With the scan tool, read the DTCs.

Is the DTC active at this time?

Yes

- Go To 3

No

- The condition that caused this DTC to set is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
- Perform the ABS INTERMITTENT CONDITION TEST. Testing and Inspection.

2. (B31) VACUUM PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO VOLTAGE




1. Turn ignition off to the lock position.
2. Disconnect the ABS Module harness connector.
3. Disconnect the Vacuum Pressure Sensor harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (B31) Vacuum Pressure Sensor Supply circuit in the Vacuum Pressure Sensor harness connector.

Is the voltage above 5.25 volts?

Yes

- Repair the (B31) Vacuum Pressure Sensor Supply circuit for a short to voltage.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 3

3. (B31) VACUUM PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO GROUND




1. Turn ignition off to the lock position.
2. Measure the resistance between ground and the (B31) Vacuum Pressure Sensor Supply circuit at the Vacuum Pressure Sensor harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Repair the (B31) Vacuum Pressure Sensor Supply circuit for a short to ground.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 4

4. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE
1. Turn the ignition off to the lock position.
2. Replace the Vacuum Pressure Sensor.
3. Perform the ABS VERIFICATION TEST. ABS Verification Test.
4. With the scan tool, read the DTCs.

Is the DTC still active?

Yes

- Replace the Anti-Lock Brake System (ABS) Module. Anti-Lock Brake System Module - Removal.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Test complete.