Diagnostic Procedure

Ignition on, engine not running.
With the DRBIII®, read the IAT Sensor voltage.

Is the voltage below 0.1 volt?
1. Yes : Go To 2
2. No : Refer to the INTERMITTENT CONDITION symptom in the Driveability - NGC category.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Turn the ignition off.
Disconnect the IAT harness connector.

Ignition on, engine not running.

With the DRBIII®, read IAT Sensor voltage.

Is the voltage between 4.8 and 5.2 volts?
1. Yes : Replace the IAT Sensor.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
2. No : Go To 3
Turn the ignition off.
Disconnect the IAT Sensor harness connector.

Disconnect the PCM harness connector.

Measure the resistance between ground and the (K21) IAT Signal circuit at the IAT Sensor harness connector.

Is the resistance below 100 ohms?
1. Yes : Repair the short to ground in the (K21) IAT Signal circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
2. No : Go To 4
Turn the ignition off.
Disconnect the IAT Sensor harness connector.

Disconnect the PCM harness connector.

Measure the resistance between the (K21) IAT Sensor Signal circuit and the (K4) Sensor ground circuit in the IAT Sensor harness connector.

Is the resistance below 100 ohms?
1. Yes : Repair the (K167) Sensor ground shorted to the (K21) IAT Signal circuit.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
2. No : Go To 5

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

If there are no possible causes remaining, view repair.
1. Repair : Replace and program the Powertrain Control Module in accordance with the Service Information.
  Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.