Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT DTC diagnostic procedure. Refer to INTERMITTENT CONDITION .
IAT SENSOR
1. Turn the ignition off.
2. Disconnect the IAT Sensor harness connector.
3. Turn the ignition on.
4. With a scan tool, read DTCs.
  NOTE:
  The P0113 IAT SENSOR HIGH DTC should display as active or pending with the IAT Sensor harness connector unplugged.
  
  Does the scan tool display as described above?
  
  Yes
  - Verify that there is good pin to terminal contact in the Intake Air Temperature Sensor and Powertrain Control Module connectors. If no problems were found, replace the Intake Air Temperature Sensor.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (K21) IAT SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Check for continuity between ground and the (K21) IAT Signal circuit at the IAT harness connector.
  Is there continuity between ground and the (K21) IAT Signal circuit?
  
  Yes
  - Repair the (K21) IAT Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (K21) IAT SIGNAL CIRCUIT FOR A SHORT TO THE (K915) SENSOR GROUND CIRCUIT
1. Check for continuity between the (K21) IAT Signal circuit and the (K915) Sensor Ground circuit in the IAT Sensor harness connector.
  Is there continuity between the (K21) IAT Signal circuit and the (K915) Sensor Ground circuit?
  
  Yes
  - Repair the (K21) IAT Signal circuit for a short to the (K915) Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  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. Perform any Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .