Diagnostic Test

WARNING: This page is about a different car, the 2017 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 DIAGNOSIS AND TESTING .
  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 ASCM VERIFICATION TEST .
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 ASCM VERIFICATION TEST .
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 ASCM VERIFICATION TEST .
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 ASCM VERIFICATION TEST .
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 (ASCM), REMOVAL .
  - Perform the ASCM VERIFICATION TEST. Refer to ASCM VERIFICATION TEST .
  No
  - Repair the (D150) CAN C Bus (-) circuit for an open.
  - Perform the ASCM VERIFICATION TEST. Refer to ASCM VERIFICATION TEST .