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.

INTAKE AIR TEMPERATURE
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 -7°C (19.4°F).
3. Turn the ignition on.
4. With a scan tool, compare the AAT, ECT, and IAT sensor values.
  Is the Intake Air Temperature Sensor value within 10°C (18°F) of the other two sensor values?
  
  Yes
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
  No
  - Go To 2
CHECK FOR HIGH RESISTANCE IN THE (K21) IAT SIGNAL CIRCUIT
1. Turn the ignition off.
2. Disconnect the Intake Air Temperature Sensor (IAT) harness connector.
  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.
3. Disconnect the PCM C2 harness connector and connect the (special tool #10436, Adapter, GPEC Diagnostic).
4. Measure the resistance of the (K21) IAT Signal circuit between the Intake Air Temperature Sensor harness connector and the GPEC Adaptor.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 3
  No
  - Repair the (K21) IAT Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK FOR HIGH RESISTANCE IN THE (K915) SENSOR GROUND CIRCUIT
1. Measure the resistance of the (K915) Sensor Ground circuit between the Intake Air Temperature Sensor harness connector and the GPEC Adaptor.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the (K915) Sensor Ground for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
INTAKE AIR TEMPERATURE SENSOR

Fig 1: Checking Intake Air Temperature Sensor
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Reconnect the PCM harness connectors.
3. Turn the ignition on.
4. With the scan tool, read the IAT Sensor signal voltage.
5. Connect a jumper between the (K915) Sensor Ground circuit and the (K21) IAT Signal circuit at the Intake Air Temperature Sensor harness connector.
6. Using the scan tool, read the IAT Sensor signal voltage.
  NOTE:
  The voltage should read 5.0 volts with the harness disconnected and 0 volts with the jumper in place.
  
  Does the voltage read as described above?
  
  Yes
  - Replace the Intake Air Temperature Sensor in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Intake Air Temperature Sensor and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
5. Look for the data to change or for the DTC to reset during the wiggle test.
6. Perform any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .