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.

NOTE: All MAP Sensor, IAC, and/or TPS codes present must be diagnosed first before proceeding.

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 - 2 .
Inspect the Intake Manifold for vacuum leaks.
Inspect the Power Brake Booster for any vacuum leaks.

Inspect the PCV system for proper operation or any vacuum leaks.

Were any problems found?
1. Yes --> Repair vacuum leak as necessary.
  Perform POWERTRAIN VERIFICATION TEST VER - 2 .
2. No --> Go To 3
Inspect the Air Induction System for the following problems.
Restrictions: Dirty Air Cleaner, Foreign material in the air intake tube, etc.

Leaks: Air Intake tube connection, Air Cleaner housing, etc.

Were any problems found?
1. Yes --> Repair or replace as necessary.
  Perform POWERTRAIN VERIFICATION TEST VER - 2 .
2. No --> Go To 4
Inspect the throttle body plate for carbon build up or other restrictions.
Inspect the throttle linkage for binding and smooth operation.

Ensure the throttle plate is resting on the stop at idle.

Remove IAC, inspect the pintle and its seating surface inside the throttle body.

Were any problems found?
1. Yes --> Clean and/or replace the throttle body as needed.
  Perform POWERTRAIN VERIFICATION TEST VER - 2 .
2. No --> Go To 5
Turn the ignition off.
Disconnect IAC Motor harness connector.

Disconnect the PCM harness connectors.

Measure the resistance of each of the IAC Driver circuits from the IAC Motor harness connector to the PCM harness connector.

Is the resistance below 5.0 ohms?
1. Yes --> Go To 6
2. No --> Repair the open in the appropriate IAC Driver circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 2 .

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 - 2 .