Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
If any of the following component DTCs have set along with P0688, diagnose them first before continuing: Ignition Coil(s), Fuel Injector(s), ASD Control.

NOTE:
If DTC P0685 is also present, diagnose and repair that DTC before continuing.
1. Ignition on, engine not running.
2. With the scan tool, select View DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (F342) ASD CONTROL OUTPUT CIRCUIT(S) FOR A SHORT TO GROUND
1. Measure the resistance between ground and each of the (F342) ASD Control Output circuits at the PDC harness.
  Is the resistance below 10k Ohms?
  
  Yes
  - Repair the short to ground in the (F342) ASD Control Output circuit(s).
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (F342) ASD CONTROL OUTPUT CIRCUIT(S) FOR AN OPEN/HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the PCM harness connectors.
  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.
3. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
4. Measure the resistance of each (F342) ASD Control Output circuit from the PDC harness to the appropriate terminals of GPEC Adaptor.
  Is the resistance below 5.0 Ohms for each circuit?
  
  Yes
  - Go To 4
  No
  - Repair the (F342) ASD Control Output circuit(s) for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
POWER DISTRIBUTION CENTER
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related PDC and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the PDC and Powertrain Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace and program the Power Distribution Center in accordance with the service information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .