Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR OVERUSE DTCS PRESENT
NOTE:
Repair all electrical and communication DTCs before continuing with this diagnostic procedure.

Turn the ignition on.
1. With the scan tool, record and erase the DTCs.
2. Cycle the ignition from off to on.
3. With the scan tool, read the DTCs.
  NOTE:
  If any of these DTCs are present DTC C15A1-00-UNABLE TO OBTAIN DESIRED RIDE HEIGHT will set.
4. Overuse DTC list:
  - C155E-92
  - C1562-92
  - C1562-98
  - C1566-92
  - C1567-92
  - C1568-92
  - C1569-92
  - C159F-92
  - C15A0-92
  - C15C0-98
  Are any of the above DTCs present?
  
  Yes
  - Go To 2
  No
  - Use the table above for the Air Suspension conditions and follow the action procedures to repair the vehicle.
AIR SUSPENSION CONDITION IS PRESENT
1. Turn the ignition off.
2. Check for any Service Information Technical Service Bulletins (TSB) that may apply.
3. Check the ASCM Fuse M2 (20A) and the Air Compressor Fuse J1 (40A).
4. Inspect for the following:
  - doors or liftgate open.
    NOTE:
    Doors and Liftgate status are ignored when system is in diagnostic mode.
  - pinched or damaged lines.
  - damaged or leaking air-spring.
  - sensor linkages are installed and connected correctly.
  - no water present in hose or filter.
  - blocked air compressor intake line.
5. Turn the ignition on.
  NOTE:
  With the scan tool select metric units for proper accuracy.
  
  With the scan tool, generate a vehicle scan-log with the environmental conditions.
  
  NOTE:
  The acceptable amount of air is between 165 and 221 bar-liters (2392.5 to 3204.5 psi-liters).
  
  With the scan tool, perform the system Air Mass routine and record the amount of air in the system.
  
  Were any problems found or Air Mass out of range?
  
  Yes
  - Go To 3
  No
  - Go To 6
AIR SUSPENSION ON-BOARD AIR MAKEUP PROCEDURE
NOTE:
A properly functioning system will make up for small leaks.

Start the engine.
1. With the scan tool, under Miscellaneous Functions run the "Air Mass Routine".
2. Record the Air Mass value.
3. Listen for Air Compressor to run (approx.15 sec).
4. Air Compressor will stop for (approx. 7 sec) while discharging exhausted air.
5. After three cycles of the system run the "Air Mass Routine".
6. With the scan tool, perform the system Air Mass routine and record the amount of air in the system.
  Did the Air Mass increase?
  
  Yes
  - Go To 4
  No
  - Go To 6
AIR SUSPENSION RIDE HEIGHT ROUTINE
1. With the scan tool, under Miscellaneous Functions run the "Air Ride Height Routine".
  Is the Air Suspension system operating correctly?
  
  Yes
  - Test complete, the condition or condition that originally set this DTC is not present at this time.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 6
TERRAIN SWITCH
1. Turn the ignition on.
2. With the scan tool, monitor the Terrain Switch while pressing the up and down buttons on the Terrain Switch.
  Does the Terrain Switch operate correctly?
  
  Yes
  - Go To 6
  No
  - Replace the Terrain Switch in accordance with the Service Information.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
AIR SUSPENSION CONTROL MODULE (ASCM)
1. With the scan tool, erase the DTCs.
2. Start the vehicle.
3. With the scan tool, read the DTCs.
  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, REMOVAL .
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete, the condition or condition that originally set this DTC is not present at this time.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .