Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

ACTIVE DTC
NOTE:
If you see this DTC after the BCM or PCM module has been reflashed, clear the DTC and test drive the vehicle.

NOTE:
If there are any coolant temperature sensor DTC's present, perform the Diagnostics for those DTCs before continuing with this one.
1. Ignition on, start the engine.
2. With a scan tool read DTCs.
  Is the DTC active or pending at this time?
  
  Yes
  - This DTC can be caused by disconnecting the Battery before allowing the normal 10 minute power down. Clear the DTC and test drive.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  No
  - Go To 2
CHECK FOR A (RECENTLY) REPROGRAMMED CONTROL MODULE
Were the PCM or BCM recently Reprogrammed?

Yes
- This fault has the potential to set if the PCM or BCM are reprogrammed. Clear the DTC and test drive.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
No
- Go To 3
CHECK THE ECT SENSOR VALUE
1. Remove the ECT Sensor and reconnect the wiring to the sensor.
2. Turn ignition on.
3. Monitor the Scan Tool while heating the sensor with an external heat source (DO NOT USE OPEN FLAME).
  Does the reading from the ECT Sensor increase at least 3°C (5°F) on the Scan Tool?
  
  Yes
  - Go To 4
  No
  - Replace the Engine Coolant Temperature (ECT) Sensor in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
COMPARE THE ENGINE COOLANT TEMPERATURE SENSOR VALUE TO OTHER TEMPERATURE SENSORS
1. Let vehicle cold soak for eight hours.
2. Turn the ignition on.
3. With a scan tool, monitor the Ambient Air Temperature Sensor, the Turbo Compressor Inlet Temperature Sensor, and the ECT Sensor.
  NOTE:
  Make sure the Ambient Air Temperature is above -7°C (20°F).
  
  NOTE:
  Make sure there is no external heat source, such as a block heater, operating during this test or within the 8 hour cold soak.
  
  Does the ECT Sensor read more than a 10°C (18°F) above or below the other sensors?
  
  Yes
  - Replace the Engine Coolant Temperature (ECT) Sensor in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Body Control Module (BCM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
    .