Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

TEMPERATURE SENSOR READINGS
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. Allow the engine to cold soak with the ignition off long enough for the engine temperature to cool to near ambient temperature.
2. Turn the ignition on.
3. With the scan tool, read the ECT, Ambient Air Temp and Intake Air Temp Sensor temperature 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
EXCESSIVE RESISTANCE IN THE TEMPERATURE SENSOR SIGNAL CIRCUIT
1. Turn the ignition off.
2. Disconnect the suspected sensor.
3. Disconnect the PCM C2 or BCM C4 harness connector depending on the sensor.
  CAUTION:
  Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.
4. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
5. Measure the resistance of the Sensor Signal circuit between the suspect sensor harness connector and the GPEC Adaptor or BCM C4 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 3
  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 suspect sensor harness connector and the GPEC Adaptor or BCM C4 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 8
  No
  - Repair the excessive resistance in the Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
1. Measure the resistance between ground and the suspect Sensor Signal circuit at the Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 5
  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 6
  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 7
TEMPERATURE SENSOR
1. Reconnect the PCM C2 or BCM C4 harness connector.
2. Turn the ignition on.
3. With the scan tool, read the voltage of the suspected Sensor.
4. Connect a jumper between the Sensor Signal circuit and the Sensor ground circuit of the ECT Sensor, IAT Sensor and AAT 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. Refer to SENSOR, COOLANT TEMPERATURE, REMOVAL or SENSOR, AIR TEMPERATURE, INTAKE, REMOVAL .
  - 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 MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .