Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY THE DTC IS ACTIVE
NOTE:
This DTC must be active for the results of this test to be valid.
1. Perform any Technical Service Bulletins (TSBs) that may apply.
2. Ignition on.
3. With the scan tool, record and erase DTCs.
4. Cycle the ignition switch from off to on.
5. With the scan tool, read DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go To 2
  No
  - Go To 3
(F425) REMOTE PTO SWITCH CIRCUIT SHORT TO GROUND
1. Turn the ignition off to the lock position
2. Disconnect the PTO Upfitters Switch harness connector.
3. Disconnect the PTO Upfitters harness connector.
4. Measure the resistance of the (F425) Remote PTO Switch circuit and ground.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (F425) Remote PTO Switch circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Vehicle System Interface Module (VSIM) in accordance with the Service Information. Refer to MODULE, VEHICLE SYSTEM INTERFACE, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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 BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.