Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

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 8
LEFT REAR RIDE HEIGHT SENSOR HARNESS CONNECTOR
1. Turn the ignition off to the lock position.
2. Check the Left Rear Ride Height Sensor for disconnected, damaged, or loose harness connector.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
(S146) 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE
1. Disconnect the ASCM C2 harness connector.
2. Disconnect the Left Rear Ride Height Sensor harness connector.
3. Measure the resistance of (S146) 5 Volt Supply circuit between ASCM C2 harness connector and the Left Rear Ride Height Sensor harness connector.
  Is the resistance above 5 Ohms?
  
  Yes
  - Repair the (S146) 5 Volt Supply circuit for an open or high resistance.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
(S147) SENSOR RETURN CIRCUIT OPEN OR HIGH RESISTANCE
1. Measure the resistance of the (S147) Sensor Return circuit between the ASCM C2 harness connector and the Left Rear Ride Height Sensor harness connector.
  Is the resistance above 5 Ohms?
  
  Yes
  - Repair the (S147) Sensor Return circuit for an open or high resistance.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
(S148) LR HEIGHT SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
1. Measure the resistance of the (S148) LR Height Sensor Signal circuit between the ASCM C2 harness connector and the Left Rear Ride Height Sensor harness connector.
  Is the resistance above 5 Ohms?
  
  Yes
  - Repair the (S148) LR Sensor Signal circuit for an open or high resistance.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 6
(S148) LEFT REAR RIDE HEIGHT SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
1. Ignition on, engine not running.
2. Measure the voltage between ground and (S148) LR Height Sensor Signal circuit in the Left Rear Ride Height Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (S148) Left Rear Ride Height Sensor Signal circuit for a short to voltage.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 7
LEFT REAR RIDE HEIGHT SENSOR
1. Replace the Left Rear Ride Height Sensor in accordance with the Service Information. (Refer to REMOVAL ).
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, REMOVAL .
  - 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.
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 .
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.