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.

VERIFY THE DTC IS ACTIVE
NOTE:
If multiple DTCs are present, inspect the wiring and harness connector at the Air Suspension Compressor.
1. Ignition on, engine not running.
2. With the scan tool, record and erase the DTCs.
3. With the scan tool, read the DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Go To 2
  No
  - Go To 6
AIR SUSPENSION RELAY
1. Turn the ignition off to the lock position.
2. Install a known good relay
3. Ignition on, engine not running.
4. With the scan tool, erase the DTCs.
5. With the scan tool, read the DTCs.
  Is the status still Active for this DTC?
  
  Yes
  - Go To 3
  No
  - Install a new Air Suspension Relay.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(Y38) COMPRESSOR RELAY SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 1: Checking Compressor Relay Signal Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off to the lock position.
2. Remove the Air Suspension Relay.
3. Disconnect the ASCM C2 harness connector.
4. Measure the resistance of the (Y38) Compressor Relay Signal circuit between the ASCM C2 harness connector and the Air Suspension Relay.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the (Y38) Compressor Relay Signal circuit for an open or high resistance.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
(Y39) AIR COMPRESSOR RELAY RETURN CIRCUIT OPEN OR HIGH RESISTANCE

Fig 2: Checking Air Compressor Relay Return Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (Y39) Compressor Relay Return circuit between the ASCM C2 harness connector and the Air Suspension Relay.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the (Y39) Compressor Relay Return circuit for an open or high resistance.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
(Y39) AIR COMPRESSOR RELAY RETURN CIRCUIT SHORTED TO GROUND

Fig 3: Checking Air Compressor Relay Return Circuit For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the (Y39) Air Compressor Relay Return circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (Y39) Compressor Relay Return circuit for a short to ground.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - 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 .
INTERMITTENT WIRING AND CONNECTORS
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
3. Look for the data to change or for the DTC to reset during the wiggle test.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.