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.

Check for any related TSBs.
Ignition on, engine not running.

With the DRBIII®, read DTCs and record the related Freeze Frame data.

Is the Good Trip Counter displayed and equal to zero?
1. Yes --> Go To 2
2. No --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
  Perform POWERTRAIN VERIFICATION TEST VER - 6 .
Turn the ignition off.
Disconnect the Leak Detection Pump electrical harness connector.

Start the engine.

With the DRBIII®, actuate the LDP Solenoid.

Using a 12-volt test light connected to ground, check the (K125) Generator Source circuit at the LDP connector.

Does the test light illuminate brightly?
1. Yes --> Go To 3
2. No --> Repair the open in the (K125) Generator Source circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 6 .
Turn the ignition off.
Connect a 12-volt test light to a good 12-volt source.

Ignition on, engine not running.

With the DRBIII®, actuate the LDP Solenoid.

Probe the (K106) LDP Solenoid Control circuit with the test light while the Pump is actuating.

Does the test light blink?
1. Yes --> Go To 4
2. No --> Go To 5
If there are no possible causes remaining, view repair.
1. Repair
  1. Replace the Leak Detection Pump.
  2. Perform POWERTRAIN VERIFICATION TEST VER - 6 .
Turn the ignition off.
Disconnect the PCM harness connectors.

Measure the resistance of the (K106) LDP Solenoid Control circuit from the PCM harness connector to the LDP harness connector.

Is the resistance below 5.0 ohms?
1. Yes --> Go To 6
2. No --> Repair the open in the (K106) Leak Detection Pump Solenoid Control circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 6 .
Measure the resistance between ground and the (K106) LDP Solenoid Control circuit.
Is the resistance below 100 ohms?
1. Yes --> Repair the short to ground in the (K106) LDP Solenoid Control circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 6 .
2. No --> Go To 7

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 - 6 .