Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Dodge Pickup and 2004 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.

Ignition on, engine not running.
With the DRBIII®, read the PNP switch input state.

While moving the gear selector through all gear positions Park to 1st and back to Park, watch the DRBIII® display.

Did the DRBIII® display P/N and D/R in the correct gear positions?
1. Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go Td 2
Turn the ignition off.
Disconnect the PCM harness connector.

Disconnect the TRS (P/N switch) harness connector.

Check connectors - Clean/repair as necessary

Measure the resistance of the (T24) P/N Sense circuit between the PCM C1 harness connector and the TRS (P/N) switch harness connector.

Is the resistance below 5.0 ohms?
1. Yes --> Go To 3
2. No --> Repair the open in the (T24) P/N Sense circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
Measure the resistance between ground and the (T24) P/N Sense circuit.
Is the resistance below 100 ohms?
1. Yes --> Repair the short to ground in the (T24) P/N Sense circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 4
Turn the ignition off.
Connect the TRS (P/N) harness connector.

Move the gear selector through all gear positions, from Park to 1st and back.

While moving the gear selector through the gear positions, measure the resistance between ground and the (T24) P/N Sense circuit in the PCM C1 harness connector.

NOTE: The circuit is grounded in Park and Neutral and open in the other positions.

Did the display change from above 100 kohms (open) to below 10.0 ohms (grounded)?
1. Yes --> Go To 5
2. No --> Replace the TRS Assembly (P/N Switch) per Service Information.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
1. Repair
  1. Replace and program the Powertrain Control Module per Service Information.
  2. Perform POWERTRAIN VERIFICATION TEST VER - 5 .