Diagnostic Test

CHECK FOR AIR SUSPENSION CONTROL MODULE (ASCM) DTCS
1. Turn the ignition on.
2. With the scan tool, check for DTC C15A1-00-Unable to Obtain Desired Ride Height or DTC C15D9-00-Low Air Mass.
  Is DTC C15A1-00 or DTC C15D9-00 present?
  
  Yes
  - Repair the C15A1-00 or C15D9-00 DTC(s). Refer to DIAGNOSIS AND TESTING .
  No
  - Go To 2
CHECK FOR AN ACTIVE DTC
1. Turn the ignition off.
2. Wait 20 minutes.
3. Turn the ignition on.
4. With the scan tool, read ASCM DTCs and record on the repair order.
5. With the scan tool, erase ASCM DTCs.
6. With the scan tool, read ASCM DTCs.
  Is the DTC active?
  
  Yes
  - Go To 3
  No
  - Go To 5
CHECK AIR LINES FOR LEAKS OR RESTRICTIONS
1. Turn the ignition off.
2. Inspect the Air Suspension air lines for kinks, restrictions, debris or leaks.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ASCM VERIFICATION TEST .
  No
  - Go To 4
AIR SUSPENSION CONTROL MODULE (ASCM)
1. Replace the Air Suspension Control Module (ASCM) in accordance with the Service Information. Refer to MODULE, AIR SUSPENSION CONTROL, REMOVAL . Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ASCM VERIFICATION TEST .
2. Turn the ignition on.
3. With the scan tool, read the DTCs.
  Does the DTC remain active?
  
  Yes
  - Replace the Air Compressor Assembly in accordance with the Service Information. Refer to COMPRESSOR ASSEMBLY, AIR SUSPENSION, REMOVAL .
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ASCM VERIFICATION TEST .
  No
  - Test complete.
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. Refer to STANDARD PROCEDURE - ASCM VERIFICATION TEST .
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.