Diagnostics Procedures

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.

Ignition on, engine not running.
With the DRBIII®, read the Ambient Air Temperature Sensor voltage.

Is the voltage below 0.3 of a volt?
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 Ambient Air Temperature Sensor harness connector.

Ignition on, engine not running.

With the DRBIII®, read AAT Sensor voltage.

Is the voltage above 4.6 volts?
1. Yes --> Replace the Ambient Temperature Sensor.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 3
Turn the ignition off.
Disconnect the PCM harness connectors.

Measure the resistance between ground and the (G31) AAT Signal circuit in the AAT Sensor harness connector.

Is the resistance below 100 ohms?
1. Yes --> Repair the short to ground in the (G31) AAT Signal circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 4
Measure the resistance between the (G31) AAT Signal circuit and the (K900) Sensor ground circuit at the AAT Sensor harness connector.
Is the resistance below 100 ohms?
1. Yes --> Repair the short between the (K900) Sensor ground circuit and the (G31) AAT Signal circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 .
2. No --> Go To 5

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 .