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 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 Intake Air Temperature Sensor harness connector.

Ignition on, engine not running.

With the DRBIII®, read the IAT Sensor voltage.

Is the voltage above 4.6 volts?
1. Yes --> Go To 3
2. No --> Go To 5
Turn the ignition off.
Connect a juniper wire across the IAT Sensor harness connector.

Ignition on, engine not running.

With the DRBIII®, read the IAT Sensor voltage.

Is the voltage below 1.0 volt?
1. Yes --> Replace the Intake Air Temperature Sensor.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 4
NOTE: Remove the jumper wire and connect the Sensor harness connector before continuing.
Turn the ignition off.
NOTE: Ensure the voltmeter leads meet the terminals in the connector and that there is good terminal to wire connection.

NOTE: Ensure the voltmeter leads are connected for positive polarity.

Backprobe the (K21) IAT Sensor Signal circuit at the IAT Sensor harness connector and PCM harness connector with the voltmeter leads.

Start the engine.

Allow the engine to idle.

Is the voltage below 0.10 of a volt?
1. Yes --> Go To 6
2. No --> Repair the excessive resistance in the (K21) IAT Sensor Signal circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
Turn the ignition off.
NOTE: Ensure the voltmeter leads meet the terminals in the connector and that there is good terminal to wire connection.

NOTE: Ensure the voltmeter leads are connected for positive polarity.

Backprobe the (K4) Sensor ground circuit at the IAT Sensor harness connector and PCM harness connector with both leads of a voltmeter.

Start the engine.

Allow the engine to idle.

Is the voltage below 0.10 of a volt?
1. Yes --> Go To 6
2. No --> Repair the excessive resistance in the (K4) Sensor ground circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
NOTE: Turn the ignition off before continuing.

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 .