Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Perform any Service Bulletins that may apply.
2. Turn the ignition on.
3. With the scan tool, read ASCM DTCs and record on the repair order.
4. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
5. With the scan tool, erase ASCM DTCs.
6. Start the engine.
7. With the scan tool, read ASCM DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Go To 3
AIR SUSPENSION RIDE HEIGHT SENSORS NOT CALIBRATED
NOTE:
Verify no Compressor (Blown fuse, Low/no voltage, etc.) or Low Mass Issues exist prior to proceeding with Calibration to ensure that vehicle can reach and maintain Normal Ride Height.
1. Calibrate the ride height sensors in accordance with the Service Information. Refer to SENSOR, HEIGHT, INSTALLATION .
2. With the scan tool, read the DTCs in the ASCM.
  Does the DTC remain active?
  
  Yes
  - Replace the Air Suspension Control Module (ASCM) in accordance with the Service Information. Refer to MODULE, AIR SUSPENSION CONTROL (ASCM), REMOVAL .
  - Perform the ASCM VERIFICATION TEST. Refer to ASCM VERIFICATION TEST .
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.
  - Perform the ASCM VERIFICATION TEST. Refer to ASCM VERIFICATION TEST .
INTERMITTENT WIRING, CONNECTORS AND AIR LINES
1. Inspect the intake and exhaust air lines for restrictions, debris, or contamination.
2. Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors.
3. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
4. While monitoring the scan tool data relative to this circuit, move the air suspension 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 ASCM VERIFICATION TEST .
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.