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Home >> Ford >> 1996 >> Aerostar Van Window >> Repair and Diagnosis >> External Pages >> Different car >> Section 199 (Engine Controls - Tests W/Codes - 7.3L Diesel - EEC-IV) >> Pinpoint Tests >> Pinpoint Test C: Intake Air Temperature Sensor >> Diagnostic Aids

Diagnostic Aids

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  1. 1) DTC 0113

    DTC 0113 indicates sensor signal voltage is more than self-test maximum. Check for following possible causes:
    • Faulty sensor.
    • Faulty harness connector.
    • Faulty Powertrain Control Module (PCM).

    Ensure scan tool is connected to Data Link Connector (DLC). See VEHICLE PREPARATION & EQUIPMENT HOOKUP  under QUICK TEST. Turn ignition on. Using scan tool, access IAT V PID (voltage) from PID/DATA MONITOR & RECORD menu. If voltage is 4.9 volts or more, go to next step. If voltage is less than 4.9 volts, go to step  8).

  2. 2) Induce Opposite Failure

    Disconnect IAT sensor connector. Connect a jumper wire between negative battery terminal and terminal "B" (Gray/Yellow wire) at IAT sensor wiring harness connector. If reading is more than zero volts, go to step  4). If reading is zero volts, go to next step.

  3. 3) Check SIG RTN Circuit

    Turn ignition off. Measure resistance between ground and terminal "A" (Gray/Red wire) at IAT sensor wiring harness connector. If resistance is less than 5 ohms, replace IAT sensor. Clear DTCs, and repeat QUICK TEST . If resistance is 5 ohms or more, locate and repair open circuit in Gray/Red wire. Clear DTCs, and repeat QUICK TEST .

  4. 4) Check Sensor Signal Circuit

    Turn ignition off. Disconnect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between terminal "B" (Gray/Yellow wire) at IAT sensor wiring harness connector and test pin No. 39 at breakout box. If resistance is less than 5 ohms, replace PCM. Clear DTCs, and repeat QUICK TEST . If resistance is 5 ohms or more, locate and repair open circuit in Gray/Yellow wire. Clear DTCs, and repeat QUICK TEST .

  5. 5) DTC 0112

    DTC 0112 indicates sensor signal is less than self-test minimum. Possible causes for this DTC are:
    • Circuit grounded in wiring harness.
    • Faulty sensor.
    • Faulty harness connector.
    • Faulty Powertrain Control Module (PCM).

    Ensure scan tool is connected to Data Link Connector (DLC). See VEHICLE PREPARATION & EQUIPMENT HOOKUP  under QUICK TEST. Turn ignition on. Using scan tool, access IAT V PID (voltage) from PID/DATA MONITOR & RECORD menu. If voltage is .13 volt or less, go to next step. If voltage is more than .13 volt, go to step  8).

  6. 6) Induce Opposite Failure

    Observe scan tool and disconnect IAT sensor connector. If voltage is 4.59 volts or more, replace IAT sensor. Clear DTCs, and repeat QUICK TEST . If voltage is less than 4.59 volts, go to next step.

  7. 7) Check For Short To Ground

    Turn ignition off. Disconnect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 39 and test pins No. 51, 76, 77, 91 and 103 at breakout box. If all readings are more than 10 k/ohms, replace PCM. Clear DTCs, and repeat QUICK TEST . If any reading is 10 k/ohms or less, locate and repair short to ground in Gray/Yellow wire. Clear DTCs, and repeat QUICK TEST .

  8. 8) Continuous Memory DTC 0112 Or 1113: Check Sensor

    DTCs 0012 and 0013 indicate possible intermittent fault. Possible causes for this DTC are:
    • Faulty sensor.
    • Faulty sensor connector.
    • Open or grounded circuit in harness.
    • Faulty PCM.

    With scan tool connected, turn ignition on. Access IAT V PID (voltage) from PID/DATA MONITOR & RECORD menu. While observing scan tool, tap on sensor to simulate road shock. Wiggle sensor connector. If no change in voltage occurs, go to next step. If any change in voltage occurs, isolate fault and repair as necessary.

  9. 9) Check Wiring Harness

    While observing IAT V PID, wiggle and bend small sections of wiring harness working toward PCM. If fault is indicated (voltage fluctuates), isolate fault and repair as necessary. Clear DTCs, and repeat QUICK TEST . If no fault is found, go to next step.

  10. 10) Inspect PCM & Wiring Harness Connectors

    Turn ignition off. Disconnect PCM 104-pin connector and IAT connector. Inspect connectors for damaged pins, corrosion and loose wires. If connectors and terminals are damaged, repair as necessary and repeat QUICK TEST . If connectors and terminals are okay, fault cannot be duplicated at this time and testing is complete.
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