Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 2500 HD and 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

TEMPERATURE SENSOR COMPARISON
NOTE:
All ECT, Intake Air and Ambient Air Temperature Sensor codes must be diagnosed and repaired before continuing.

NOTE:
In cold weather, this DTC could be set by a high powered block heater and no repair would be required.
1. Turn the ignition off.
2. If possible, allow the vehicle to sit with the ignition off for more than 480 minutes in an environment where the temperature is consistent and above -64°C (-83°F).
3. Turn the ignition on.
4. With the scan tool, read the ECT, Ambient Air Temperature and Intake Air Temperature Sensor values.
  Are the temperature readings within 15°C (59°F) of each other?
  
  Yes
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
  No
  - Go To 2
TEMPERATURE SENSOR
1. Disconnect the suspected sensor.
2. With the scan tool, read the voltage of the suspected sensor.
3. Connect a jumper between the Sensor Signal circuit and the Sensor ground circuit of the suspected sensor.
  Did the voltage reading start at 4.8 to 5.0 volts and decrease to 0 volts when the jumper was installed?
  
  Yes
  - Verify that there is good pin to terminal contact in the Sensor and Control Module connectors. If OK, replace the appropriate Temperature Sensor.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
EXCESSIVE RESISTANCE IN THE TEMPERATURE SENSOR SIGNAL CIRCUIT
1. Turn the ignition off.
2. Disconnect the appropriate PCM harness connector.
3. Disconnect the appropriate BCM harness connector.
4. Measure the resistance of the suspect Sensor Signal circuit between the Sensor harness connector and the appropriate terminal of PCM harness connector or BCM harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the excessive resistance in the Temperature Sensor Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
EXCESSIVE RESISTANCE IN THE SENSOR GROUND CIRCUIT
1. Measure the resistance of the Sensor ground circuit between the Sensor harness connector and the appropriate terminal of PCM harness connector or BCM harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the Sensor ground circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
1. Measure the resistance between ground and the Sensor Signal circuit at the Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the Sensor Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
SENSOR SIGNAL CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT
1. Measure the resistance between Sensor Ground and the Sensor Signal circuit at the Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the short between the Sensor ground circuit and the Sensor Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition on.
2. Measure the voltage on the Sensor Signal circuit at the Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the Sensor Signal circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 8
POWERTRAIN CONTROL MODULE (PCM)
1. Turn the ignition off.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensors and the Powertrain Control Module (PCM).
3. Look for any chafed, pierced, pinched or partially broken wires.
4. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensor and Powertrain Control Module connectors.
5. Perform any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace and program the Powertrain Control Module in accordance with the Service Information. Refer to appropriate service information MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .