C1083

C1083- VACUUM PRESSURE SENSOR CIRCUIT PERFORMANCE





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 Pressure Sensor Signal is not changing.





1. CHECK FOR A DTC C0183-VACUUM PRESSURE SENSOR CIRCUIT PERFORMANCE

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.

CAUTION: Make sure brake capability is available before road testing.

6. Depress the brake pedal with moderate apply pressure and then release.
7. With the scan tool, read and record DTCs.

Does the scan tool display: C0183-VACUUM PRESSURE SENSOR CIRCUIT PERFORMANCE?

Yes

- Go To 2

No

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

2. CHECK FOR PINCHED VACUUM SUPPLY LINE
1. Turn the ignition off.
2. Check the vacuum supply line to brake booster for a pinched or kinked hose.

Were any problems found?

Yes

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

No

- Go To 3

3. CHECK FOR VACUUM PRESSURE SIGNAL CHANGE
1. Turn the ignition off.
2. Connect vacuum pump to brake booster.
3. Apply vacuum to booster and watch for signal change.

Is the voltage signal changing on the scan tool as vacuum is being applied?

Yes

- Go To 4

No

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

4. CHECK BRAKE BOOSTER
1. Check that the brake booster and check valve are operating properly.

Is the brake booster and check valve holding vacuum?

Yes

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

No

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