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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 747 (Engine Controls - Pinpoint Tests - 6.0L Diesel (99P E-Series & 99P F450/550)) >> Pinpoint Test F: Intake Air Temperature (IAT) Sensor >> Test Procedure

Test Procedure

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  1. F1 PRELIMINARY DIAGNOSIS FOR DTCs P0112, P0113 
    • Perform a visual inspection.
    • Connect scan tool.
    • Retrieve and record any continuous and on-demand DTCs.
    • Record freeze frame data.
    • Clear all DTCs.
    • Perform On-Demand Self-Test.

    ARE DTCS P0112 OR P0113 PRESENT? 

    Yes No
    For P0112, Go to  F2.
    For P0113, Go to  F4.    		 UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded terminals or pins. WIGGLE harness attempting to recreate the fault. REPAIR as necessary. REFER to SYMPTOM CHARTS - 6.0L DIESEL if a driveability concern exists.
  2. F2 DIAGNOSTIC TROUBLE CODE (DTC) P0112 
    NOTE: Refer to the PCM and component connector, Figure and Figure, at the beginning of this pinpoint test.
    • Possible causes:
      • circuit shorted to ground
      • IAT sensor
      • PCM
    • Check for opposite failure.
    • Key off.
    • Disconnect the IAT sensor.
    • Perform On-Demand Self-Test.

    IS DTC P0113 PRESENT? 

    Yes No
    INSTALL a new IAT sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to  F3.
  3. F3 CHECK SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect the PCM body harness connector.
    • Measure the resistance between IAT sensor electrical connector pin 6, and ground.

    IS THE RESISTANCE GREATER THAN 10,000 OHMS? 

    Yes No
    INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR short to ground in the IAT signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
  4. F4 DIAGNOSTIC TROUBLE CODE P0113 
    NOTE: Refer to the PCM and component connector, Figure and Figure, at the beginning of this pinpoint test.
    • Possible Causes:
      • circuit shorted to voltage
      • open in signal return circuit
      • IAT sensor
      • PCM
    • Key off.
    • Disconnect the IAT sensor.
    • Install a jumper between pins 1 and 6, of the IAT sensor electrical connector.
    • Key on.
    • Perform On-Demand Self-Test.

    IS DTC P0112 PRESENT? 

    Yes No
    INSTALL a new IAT sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to  F5.
  5. F5 CHECK SIGNAL RETURN CIRCUIT FOR AN OPEN 
    • Key off.
    • Disconnect the PCM body harness electrical connector.
    • Measure the resistance between IAT sensor connector pin 1, and the PCM body harness electrical connector pin 33.

    IS THE RESISTANCE LESS THAN 5 OHMS? 

    Yes No
    Go to  F6. REPAIR open in the IAT sensor return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
  6. F6 CHECK SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key on.
    • Measure the voltage between IAT sensor connector pin 6 and ground.

    IS ANY VOLTAGE INDICATED? 

    Yes No
    REPAIR short in the IAT signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to  F7.
  7. F7 CHECK SIGNAL CIRCUIT FOR AN OPEN 
    • Key off.
    • Measure the resistance between the PCM body harness pin 43, and IAT sensor connector pin 6.

    IS THE RESISTANCE LESS THAN 5 OHMS? 

    Yes No
    INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in the IAT signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
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