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.

ACTIVE DTC
NOTE:
Diagnose any CAN - C Communication DTCs before continuing.
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. Test drive the vehicle. The vehicle must exceed 48 km/h (30 mph) during the test drive. Do not cycle the ignition off when the test drive is completed.
4. With a scan tool, select View DTCs.
  Is the status Active or Pending for this DTC?
  
  Yes
  - Go To 3
  No
  - Go To 2
INTAKE AIR TEMPERATURE
1. Turn the ignition off.
2. Allow the vehicle to sit with the ignition off in an environment where the temperature is consistent and above -64° C (-83° F) until the engine coolant temperature is equal to ambient temperature.
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 15° C (59° F) of the other two sensor values?
  
  Yes
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
CHECK THE (K21) IAT SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Measuring Voltage Of IAT Sensor Signal Circuit AT IAT Sensor Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Intake Air Temperature Sensor (IAT) harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (K21) IAT Signal circuit in the Intake Air Temperature Sensor harness connector.
  Is the voltage above 5.2 volts?
  
  Yes
  - Repair the (K21) IAT Signal circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
CHECK THE (K21) IAT SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 2: Measuring Resistance Between Ground And IAT Sensor Signal Circuit AT IAT Sensor Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Measure the resistance between ground and the (K21) IAT Signal circuit at the Intake Air Temperature Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (K21) IAT Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK FOR THE (K21) IAT SIGNAL CIRCUIT SHORTED TO THE (K915) SENSOR GROUND CIRCUIT

Fig 3: Measuring Resistance Between IAT Sensor Signal Circuit And Sensor Ground Circuit AT IAT Sensor Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (K21) IAT Signal circuit and the (K915) Sensor Ground circuit at the Intake Air Temperature Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (K21) IAT Signal circuit for a short to the (K915) Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (K21) IAT SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 4: Checking IAT Signal Circuit For Open Or High Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (K21) IAT Signal circuit between the IAT Sensor harness connector and the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the (K21) IAT Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (K915) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (K915) Sensor Ground circuit between the Intake Air Temperature Sensor harness connector and the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 8
  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 5: IAT Sensor Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Connect the PCM C2 harness connector.
3. Connect a jumper between the (K915) Sensor Ground circuit and the (K21) IAT Signal circuit at the IAT Sensor harness connector.
4. Turn the ignition on.
5. Using the scan tool, read the Intake Air Temperature Sensor signal voltage.
  Is the voltage below 1.0 volt with the jumper in place?
  
  Yes
  - Replace the Intake Air Temperature Sensor in accordance with the service information. Refer to SENSOR, AIR TEMPERATURE, INTAKE, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 9
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 .