C15AE

C15AE-00-COMPRESSOR PRESSURE LINE LEAK

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

Theory of Operation

The air compressor has an air line which connects the reversing valve to the valve block. The ASCM monitors the pressure this air line when it is pressured. After a time the pressure is checked again to see if there is any pressure loss. Any appreciable pressure loss indicates that this air line has a leak.

- When Monitored:
Ignition on. Battery voltage between 9 and 16 volts.

- Set Condition:
When the Air Suspension Control Module (ASCM) monitors the pressure in the air suspension compressor line when it is pressurized. After time the pressure is checked again to see if there is any pressure loss. Any appreciable pressure loss indicates that this air line has a leak.





Diagnostic Test

1. VERIFY THE DTC IS ACTIVE

NOTE: Make sure all doors and liftgate are closed.

1. Start the vehicle.
2. With the scan tool, record and erase DTCs.
3. With the scan tool, read the DTCs in the ASCM.

Is the DTC active at this time?

Yes

- Go To 2

No

- Go To 4

2. AIR SUSPENSION COMPRESSOR AIR LINE

NOTE: Line is labeled "P" at the valve block.

1. Visually inspect the air compressor for damaged airline fitting or the compressor air line for leaks.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Go To 3

3. AIR SUSPENSION COMPRESSOR ASSEMBLY
1. Turn the ignition off to the lock position.
2. Replace the Air Suspension Compressor Assembly. Air Suspension Compressor Assembly - Removal.Perform the ASCM VERIFICATION TEST. ASCM Verification Test.
3. Ignition on, engine not running.
4. With the scan tool, erase the DTCs.
5. With the scan tool, read the DTCs.

Does the DTC remain active?

Yes

- Replace the Air Suspension Control Module (ASCM). Air Suspension Control Module - Removal.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time.

4. INTERMITTENT WIRING AND CONNECTORS
1. Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors.
2. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
3. Look for the data to change or for the DTC to reset during the wiggle test.
4. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
5. Look for the data to change other than as expected or for the DTC to reset.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time.