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 - 5 .
Turn the ignition off.
Disconnect the IAC Motor harness connector.

Disconnect the PCM harness connectors.

NOTE: The following steps are checking for a short between the IAC Driver circuits.

Measure the resistance between the (K40) IAC #1 Driver circuit and #2, #3, #4 Driver circuits.

Is the resistance below 100 ohms on any of the Drivers?
1. Yes --> Repair the short between the IAC Driver circuits.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 3

NOTE: The following steps are checking for a short between the IAC Driver circuits.

Measure the resistance between the (K60) IAC #2 Driver circuit and #3, #4 Driver circuits.
Is the resistance below 100 ohms on any of the Drivers?
1. Yes --> Repair the shorted IAC Driver circuits.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 4

NOTE: The following steps are checking for a short between the Driver Circuits.

Measure the resistance between the (K39) IAC #3 Driver circuit and the (K59) #4 Driver circuit.
Is the resistance below 100 ohms?
1. Yes --> Repair the short between the IAC Driver circuits.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 5
Remove the ASD Relay.
Using a jumper wire, jumper between the Fused B+ circuit and ASD Relay Output circuit in the PDC.

Ignition on, engine not running with the PCM and IAC harness connectors disconnected.

Measure the voltage on each of the IAC Driver circuits.

Is the voltage above 1.0 volt at any IAC Driver circuit?
1. Yes --> Repair the short to voltage on the appropriate IAC Driver circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 6
NOTE: Remove the jumper wire and install the ASD Relay before continuing.
Turn the ignition off.
Repeat each measurement for each IAC Driver circuit.

Measure the resistance between ground and each IAC Driver circuit.

Is the resistance below 100 ohms at any IAC Driver circuit?
1. Yes --> Repair the short to ground in the appropriate IAC Driver circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 7
Turn the ignition off.
Connect the PCM harness connectors.

Start and idle the engine.

Using a test light connected to ground, probe the (K40) IAC Driver #1 circuit for 10 seconds.

Repeat the above test for the remaining IAC Motor Driver circuits.

Does the test light turn on and off while probing each IAC Motor Driver circuits?
1. Yes --> Replace the Idle Air Control Motor.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Replace and program the Powertrain Control Module per Service Information.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .