Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 2500 HD and 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, navigate to Actuators and actuate the CNG Shutoff Relay to on or toggle.
3. With the scan tool, select view DTCs.
  Is the status active or pending for this DTC?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
CHECK THE (K600) CNG SHUTOFF RELAY CONTROL CIRCUIT FOR A SHORT TO THE (F342) FUSED ASD RELAY OUTPUT CIRCUIT
1. Turn the ignition off.
2. Disconnect the CNG Shutoff Relay harness connector.
3. Disconnect the PCM C2 harness connector.
4. Measure the resistance between the (F342) Fused ASD Relay Output circuit and the (K600) CNG Shutoff Relay Control circuit at the CNG Shutoff Relay harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 3
  No
  - Repair the (F342) Fused ASD Relay Output circuit for a short to the (K600) CNG Shutoff Relay Control circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (K600) SHUTOFF RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
CAUTION:
Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.
1. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
2. Measure the resistance between the (K600) CNG Shutoff Relay Control circuit and all other circuits at the GPEC Adaptor.
  Is the resistance above 10k Ohms between the (K600) CNG Shutoff Relay Control circuit and all other circuits?
  
  Yes
  - Go To 4
  No
  - Repair the (K600) CNG Shutoff Relay Control circuit for a short to the circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CNG SHUTOFF RELAY
1. Turn the ignition off.
2. Replace the CNG Shutoff Relay in accordance with the service information.
3. Turn the ignition on.
4. With the scan tool, erase DTCs.
5. With the scan tool, navigate to Actuators and actuate the CNG Shutoff Relay to on or toggle.
6. With the scan tool, select view DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Powertrain Control Module in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair complete.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .