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.

NOTE: If the engine will not idle, maintain an engine speed between 800 and 1500 RPM.

Start the engine.
Allow the engine to idle.

With the DRBIII®, read the IAC Current.

Is the IAC Current below 146 mA?
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 IAC Motor harness connector.

Remove the IAC Motor.

NOTE: Inspect the IAC air passages for restrictions and damage to the IAC valve.

Measure the resistance across the IAC Motor pin terminals (component).

Is the resistance 9.7 +/- 1.0 ohms?
1. Yes --> Go To 3
2. No --> Replace the IAC Motor.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
Disconnect the PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K961) IAC Return circuit from the IAC Motor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?
1. Yes --> Go To 4
2. No --> Repair the open in the (K961) IAC Return circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
Measure the resistance between ground and the (K961) IAC Return circuit at the IAC Motor harness connector.
Is the resistance below 100 ohms?
1. Yes --> Repair the short to ground in the (K961) IAC Return circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 5

CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the (K61) IAC Control circuit from the IAC Motor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
1. Yes --> Go To 6
2. No --> Repair the open in the (K61) IAC Control circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
Measure the resistance between ground and the (K61) IAC Control circuit at the IAC Motor harness connector.
Is the resistance below 100 ohms?
1. Yes --> Repair the short to ground in the (K61) IAC Control circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
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 - 5 .