Diagnostic Test

IAT SENSOR VOLTAGE BELOW 0.078 OF A VOLT
1. Ignition on, engine not running.
2. With a scan tool, read the IAT voltage.
  Is the voltage below 0.078 of a volt?
  
  Yes
  - Go to step 2
  No
  - Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
IAT SENSOR
1. Turn the ignition off.
2. Disconnect the IAT Sensor harness connector.
3. Ignition on, engine not running.
4. With a scan tool, read IAT voltage.
  Is the voltage above 4.5 of a volts?
  
  Yes
  - Replace the Intake Air Temperature Sensor.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 3
(K21) IAT SENSOR SIGNAL SHORTED TO GROUND

Fig 1: Checking IAT Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the PCM harness connectors.
3. Measure the resistance between ground and the (K21) IAT Sensor Signal circuit in the IAT Sensor harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the short to ground in the (K21) IAT Sensor Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 4
(K21) IAT SENSOR SIGNAL SHORTED TO THE (K900) SENSOR GROUND CIRCUIT

Fig 2: Checking IAT Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K21) IAT Sensor Signal circuit and the (K900) Sensor ground circuit in the IAT Sensor harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the short between the (K900) Sensor ground circuit and the (K21) IAT Sensor Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 5
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
1. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Replace and program the Powertrain Control Module per Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure