C15AB
C15AB-00-AIR LEAK DURING FILL
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The Air Suspension Control Module (ASCM) detects that it cannot increase reservoir pressure (fill) when the system is operating. In order to fill the reservoir air must be go through the intake air hose, ambience valve, reversing valves, the compressor, and finally through the air line leading to the reservoir itself.
- When Monitored:
Ignition on. Battery voltage between 9 and 16 volts.
- Set Condition:
Air suspension cannot fill air into the reservoir when attempting to do so. Pneumatic fault in components used when filling. This includes the air compressor, reverse valve units, ambience valve, intake hose, leaking air line to the reservoir.
Diagnostic Test
1. VERIFY THE DTC IS ACTIVE
1. Turn the ignition on.
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 6
2. AIR SUSPENSION INTAKE HOSE
1. Turn the ignition off.
2. Remove the Air Suspension Intake Hose.
NOTE: Make sure all doors and liftgate are closed.
3. Start the vehicle.
4. With the scan tool, read the DTCs in the ASCM.
Does the DTC remain active?
Yes
- Go To 3
No
- Replace or Repair the Air Suspension Intake hose. Air Suspension Hose Assembly - Removal.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.
3. AIR SUSPENSION RESERVOIR AIR LINE
1. Raise the vehicle to the highest ride height possible.
2. With the scan tool, under "Miscellaneous Functions" run the "System Pressure Measurement" routine.
3. Record the pressure in the reservoir.
4. Wait 30 minutes and rerun the "System Pressure Measurement" routine.
Did the reservoir's pressure decrease by more than 1 bar (14.5 psi)?
Yes
- Repair or Replace the Air Suspension Line. Procedures or Air Line - Removal.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.
No
- Go To 4
4. AIR SUSPENSION SOLENOID ASSEMBLY
NOTE: If any DTCs related to the Ambience Valve are present, repair them first before continuing with this diagnostic procedure.
1. Turn the ignition off.
2. Replace the Air Suspension Solenoid Assembly. Compressor Assembly Valve Block - Removal.Perform the ASCM VERIFICATION TEST. ASCM Verification Test.
NOTE: Make sure all doors and liftgate are closed.
3. Start the vehicle.
4. With the scan tool, read the DTCs in the ASCM.
Does the DTC remain active?
Yes
- Go To 5
No
- Test complete, the condition or conditions that originally set this DTC are not present at this time.
5. AIR SUSPENSION COMPRESSOR ASSEMBLY
NOTE: If any DTCs related to the Reversing Valves are present, repair them first before continuing with this diagnostic procedure.
1. Turn the ignition off.
2. Replace the Air Suspension Compressor Assembly. Air Suspension Compressor Assembly - Removal.Perform the ASCM VERIFICATION TEST. ASCM Verification Test.
NOTE: Make sure all doors and liftgate are closed.
3. Start the vehicle.
4. With the scan tool, read the DTCs in the ASCM.
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.
6. 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.