Test F: Intake Air Temperature Sensor 1: Testing

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: The Powertrain Control Module (PCM) harness connectors must be properly seated and the connector latch properly attached to eliminate possible driveability concerns or a no-start condition. Installing PCM connectors on an angle may cause a bad connection, misdiagnosis and damaged components. Install the connector on where the lever pivots and seats itself. Apply light pressure to get the connector into position on the PCM lever to fully seat the connector.

NOTE: When the PCM engine harness connector is disconnected additional DTCs will be set. All DTCs must be cleared before returning the vehicle to service.

1) Preliminary Diagnosis For DTCs P0112, P0113

Perform visual inspection. Connect scan tool. Retrieve and record any continuous and on-demand DTCs. Record freeze frame data. Clear all DTCs. Perform the KOEO ON-DEMAND SELF-TEST under QUICK TEST. Are DTCs P0112 or P0113 present? If yes, for P0112, go to next step. For P0113, go to step 4). If no, unable to duplicate condition. Check for loose connections, damaged or corroded terminals or pins. Wiggle harness attempting to recreate the fault. Repair as necessary. See TROUBLE SHOOTING - NO CODES - 6.0L DIESEL article, if a driveability concern exists.

2) DTC P0112

Possible causes are:
- Circuit shorted to ground.
- Faulted IAT1 sensor.
- Faulted PCM.
Check for opposite failure. Key off. Disconnect the IAT1 sensor. Perform On-Demand Self-Test. Is DTC P0113 present? If yes, install a new IAT1 sensor. Restore the vehicle. Clear DTCs and retest the system. If no, go to next step.

3) Check Signal Circuit For A Short To Ground

Disconnect the PCM body harness connector. Measure the resistance between IAT1 sensor electrical connector terminal No. 6, and ground. See Figure. Is the resistance greater than 10,000 ohms? If yes, install a new PCM. Restore the vehicle. Clear DTCs and retest the system. If no, repair short to ground in the IAT1 signal circuit. Restore the vehicle. Clear DTCs and retest the system.

4) DTC P0113

Possible causes are:
- Circuit shorted to voltage.
- Open in signal return circuit.
- Faulted IAT1 sensor.
- Faulted PCM.
Key off. Disconnect the IAT1 sensor. Measure the resistance between IAT1 sensor connector pin 1, and ground. See Figure. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair open in the IAT1 sensor return circuit. Restore the vehicle. Clear DTCs and retest the system.

5) Induce Opposite Failure

Install a jumper between terminals No. 1 and 6 of the IAT1 sensor electrical connector. Key on. Perform the KOEO ON-DEMAND SELF-TEST under QUICK TEST. Is DTC P0112 present? If yes, install a new IAT1 sensor. Restore the vehicle. Clear DTCs and retest the system. If no, go to next step.

6) Check Signal Circuit For A Short To Voltage

Key off. Disconnect the PCM body harness electrical connector C1381A. Key on. Measure the voltage between IAT1 sensor connector terminal No. 6 and ground. Is the voltage less than 0.2 volt? If yes, repair short in the IAT1 signal circuit. Restore the vehicle. Clear DTCs and retest the system. If no, go to next step.

7) Check Signal Circuit For An Open

Key off. Measure the resistance between the PCM body harness connector C1381A terminal No. 43, and IAT1 sensor connector terminal No. 6. See CONTROL MODULE CONNECTOR IDENTIFICATION . Is the resistance less than 0.5 ohm? If yes, install a new PCM. Restore the vehicle. Clear DTCs and retest the system. If no, repair open in the IAT1 signal circuit. Restore the vehicle. Clear DTCs and retest the system.