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 before continuing.
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 - 5 .
Turn the ignition off.
Disconnect the EVAP Purge Solenoid harness connector.

Ignition on, engine not running.

Using a 12-volt test light, jump across the Evap Purge Solenoid harness connector.

With the DRBIII®, actuate the EVAP Purge Solenoid.

Does the test light flash on and off?
1. Yes --> Go To 3
2. No --> Go To 7
Turn the ignition off.
Connect the Evap Purge Solenoid harness connector.

Disconnect the vacuum hoses at the Evap Purge Solenoid.

NOTE: After disconnecting the Evap Purge Solenoid vacuum connections, inspect the lines and solenoid for any signs of contamination from the EVAP Canister. This may indicate a faulty rollover valve. Replace/repair as necessary.

Using a hand vacuum pump, apply 10 in Hg to the "CAN" of the EVAP Purge Solenoid.

NOTE: Monitor the vacuum gauge for at least 15 seconds.

Does the EVAP Purge Solenoid hold vacuum?
1. Yes --> Go To 4
2. No --> Replace the Evap Purge Solenoid.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
Ignition on, engine not running.
Using the DRBIII®, monitor the NVLD Switch State with the vacuum pump still installed and holding vacuum.

Does the DRBIII® display the NVLD state OPEN?
1. Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 5
NOTE: Remove the vacuum pump and connect the vacuum hose before continuing.
Disconnect the NVLD electrical connector.
Does the Switch change from CLOSED to OPEN?
1. Yes --> Replace the NVLD Assembly.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 6
Turn the ignition off.
Disconnect the PCM harness connectors.

Measure the resistance between ground and the (K107) NVLD Switch Signal circuit in the NVLD Assembly harness connector.

Is the resistance below 100 ohms?
1. Yes --> Repair the short to ground in the (K107) NVLD Switch Signal circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 8
Turn the ignition off.
Disconnect the PCM harness connectors.

Measure the resistance between ground and the (K52) Evap Purge Sol Control circuit at the EVAP Purge Solenoid harness connector.

Is the resistance below 100 ohms?
1. Yes --> Repair the short to ground in the (K52) Evap Purge Sol Control circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 8

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 .