C1246

C1246-VACUUM PRESSURE SENSOR SUPPLY CIRCUIT





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

- When Monitored:
With the ignition on.

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





1. CHECK FOR A DTC C1246-VACUUM PRESSURE SENSOR SUPPLY 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.

NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. It may be necessary to test drive the vehicle within the DTC monitoring and set conditions in order for this DTC to set.

6. Depress and release the brake pedal.
7. With the scan tool, read and record DTCs.

Does the scan tool display: C1246-VACUUM PRESSURE SENSOR SUPPLY CIRCUIT?

Yes

- Go To 2

No

- Perform the ABS INTERMITTENT CONDITION TEST ABS Intermittent Condition Test.

2. (B31) VACUUM PRESSURE SENSOR SUPPLY CIRCUIT




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

Is the voltage between 4.75 to 5.25?

Yes

- Go To 3

No

- Go To 4

3. VACUUM PRESSURE SENSOR




1. Turn the ignition off.
2. Reconnect Vacuum Pressure Sensor.
3. Turn the ignition on.

NOTE: Care should be taken to preserve connector seal when backprobing.

4. Measure the voltage on the (B31) Vacuum Pressure Sensor Supply circuit while backprobing the Vacuum Pressure Sensor harness connector.

Is the voltage between 4.75 to 5.25?

Yes

- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST ABS Verification Test.

No

- Replace the Vacuum Pressure Sensor.
- Perform ABS VERIFICATION TEST ABS Verification Test.

4. VACUUM PRESSURE SENSOR SIGNAL OUT OF RANGE




1. Measure the voltage on the (B31) Vacuum Pressure Sensor Supply circuit in the Vacuum Pressure Sensor harness.

Is the voltage above 5.25?

Yes

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

No

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