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.

TEST FOR INTERMITTENT CONDITION
NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
1. Turn the ignition on.
  NOTE:
  Make sure the battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, read the module status.
  NOTE:
  Check the BCM for any active CAN DTCs and perform the appropriate diagnostics before proceeding. Refer to DIAGNOSTIC CODE INDEX .
  
  Does the scan tool indicate that the module is active on the bus?
  
  Yes
  - Perform the Stored Lost Communication DTCs diagnostic procedure. Refer to STORED LOST COMMUNICATION DTCS .
  No
  - Go To 2
CHECK (A206) FUSED B(+) CIRCUIT FOR AN OPEN OR SHORT
1. Turn the ignition off.
2. Disconnect the Air Suspension Control Module (ASCM) C2 harness connector.
3. Using a 12-volt test light connected to ground, check the (A206) Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Repair the (A206) Fused B(+) circuit for an open or short.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (F944) IGNITION RUN/START RELAY OUTPUT CIRCUIT FOR AN OPEN OR SHORT
NOTE:
Install a substitute relay
1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (F944) Ignition Run/Start Relay Output circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (F944) Ignition Run/Start Relay Output circuit for an open or short.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (Z906) GROUND CIRCUIT FOR AN OPEN
1. Using a 12-volt test light connected to 12-volts, check the (Z906) Ground circuit.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go To 5
  No
  - Repair the (Z906) Ground circuit for an open.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (D151) CAN C BUS (+) CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Air Suspension Control Module (ASCM) C1 harness connector.
3. Disconnect the Star CAN C Dash C13 harness connector.
4. Measure the resistance of the (D151) CAN C Bus (+) circuit between the Star CAN C Dash C13 harness connector and the ASCM C1 harness connector.
  Is resistance below 5.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (D151) CAN C Bus (+) circuit for an open.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (D150) CAN C BUS (-) CIRCUIT FOR AN OPEN
1. Measure the resistance of the (D150) CAN C Bus (-) circuit between the Star CAN C Dash C13 harness connector and the ASCM C1 harness connector.
  Is resistance below 5.0 Ohms?
  
  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
  - Repair the (D150) CAN C Bus (-) circuit for an open.
  - Perform the ASCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .