LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2003 >> Excursion 6.0 P, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 7.3L (995, 996 F650/750, 99F E Series & 99F F450/550) DIESEL) >> System Tests >> Test Di: Manifold Air Temperature Sensor (Except ECONOLINE) >> Testing

Test Di: Manifold Air Temperature Sensor (Except ECONOLINE): Testing

WARNING: This page is about a different variant/trim than selected.
FAULT CODE SETTING CONDITION

Fault Code KOEO KOER Continuous Memory
P1118
All except F650-750 (1) Test DI  , Step  4)   Test DI  , Step  4)
F650-750 Test DI  , Step  4)   Test DI  , Step  4)
P1119
All except F650-750 (1) Test DI  , Step  1)   Test DI  , Step  1)
F650-750 Test DI  , Step  1)   Test DI  , Step  1)
P0096 (F650-750)(2)     Test DI  , Step  7)
(1) MIL illuminates when fault is detected in second drive cycle (California, OBD-II calibration).

(2) MIL illuminates when fault is present (Federal).
    NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  1. 1) DTC P1119: MAT Sensor Circuit High Input
    DTC P1119 indicates that MAT sensor signal voltage is more than self-test maximum. The following are possible causes for this fault:
    • Open SIG RTN Circuit
    • Faulty MAT Sensor Or Connector
    • Faulty PCM

    Disconnect MAT sensor connector. MAT sensor is located at center front of engine. MAT sensor 2-pin connector has Red/Yellow and Gray/Red wires. Using DVOM, measure resistance between chassis ground and MAT sensor harness connector terminal No. 1 (Gray/Red wire). See Figure. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gray/Red wire between PCM and MAT sensor.

  2. 2) Induce Opposite Failure

    Turn ignition on. Connect a jumper wire between MAT sensor harness connector terminals. Perform KOEO ON-DEMAND SELF-TEST  under QUICK TEST. If DTC P1118 is not present, go to next step. If DTC P1118 is present, replace MAT sensor. Clear DTCs and retest.

  3. 3) Check MAT Signal Circuit

    Turn ignition off. Disconnect PCM connector and inspect for damaged pins, corrosion and loose wires. PCM is located in left rear of engine compartment, near brake master cylinder. Repair connector as necessary. Install Rotunda Breakout Box (014-00950), leaving PCM disconnected. Using DVOM, measure resistance between test pin No. 62 at breakout box and MAT sensor harness connector terminal No. 2 (Red/Yellow wire). If resistance is less than 5 ohms, go to step  6). If resistance is 5 ohms or more, repair open in Red/Yellow wire between PCM and MAT sensor. Clear DTCs and retest.
    4. NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  4. 4) KOEO & Continuous Memory Only DTC P1118: Induce Opposite DTC P1119
    DTC P1118 indicates that Manifold Air Temperature (MAT) sensor signal voltage is less than self-test maximum. MAT sensor may also be referred to as Air Charge Temperature (ACT) sensor. The following are possible causes for this fault:
    • MAT Signal Circuit Shorted To Ground
    • MAT SIG RTN Circuit Open
    • Faulty MAT Sensor
    • Faulty Powertrain Control Module (PCM)

    Disconnect MAT sensor connector. MAT sensor is located at center front of engine and has a 2-pin connector with Red/Yellow and Gray/Red wires. Perform KOEO ON-DEMAND SELF-TEST  under QUICK TEST. If DTC P1119 is not present, go to next step. If DTC P1119 is present, replace MAT sensor. Clear DTCs and retest.

  5. 5) Check MAT Sensor Signal For Short To Ground

    Turn ignition off. Disconnect PCM connector and inspect for damaged pins, corrosion and loose wires. PCM is located in left rear of engine compartment, near brake master cylinder. Repair connector as necessary. Install Rotunda Breakout Box (014-00950), leaving PCM disconnected. Using DVOM, measure resistance between test pin No. 62 and test pins No. 51, 77, 91 and 103 at breakout box. If each resistance is more than 10 k/ohms, replace PCM. Clear DTCs and retest. If any resistance is 10 k/ohms or less, locate and repair short to ground in MAT signal circuit (Red/Yellow wire) between PCM and MAT sensor. Clear DTCs and retest.

  6. 6) Check SIG RTN Circuit For Open

    Using DVOM, measure resistance of SIG RTN circuit (Gray/Red wire) between MAT sensor harness connector terminal No. 1 and test pin No. 91 at breakout box. If resistance is less than 5 ohms, replace PCM. Clear DTCs and retest. If resistance is 5 ohms or more, repair open in Gray/Red wire between PCM and MAT sensor. Clear DTCs and retest.

  7. 7) DIAGNOSTIC TROUBLE CODE (DTC) P0096

    DTC P0096 indicates that a MAT sensor range/performance fault has been detected. P0096 is set when the vehicle has had Engine Oil Temperature (EOT) sensor transition from below 104°F (40°C) to above 176°F (80°C) for ten consecutive drive cycles, without a MAT sensor signal change. Possible causes:
    • Faulty MAT Sensor
    • Faulty MAT Sensor Circuitry
    • Faulty PCM

    Inspect MAT sensor circuitry at sensor and PCM. Inspect for damage, loose or pushed-out pins, loose or poorly crimped wires. If all connectors and terminals are okay, go to next step. If all connectors and terminals are not okay, repair as necessary. Clear DTCs and retest.

  8. 8) Check For MAT Sensor Fault Codes

    Perform KOEO ON-DEMAND SELF-TEST  under QUICK TEST. If other fault codes are present, repair those faults before proceeding. Clear DTCs and retest. If only DTC P0096 is present, go to next step.

  9. 9) Check MAT Sensor Operation

    Clear continuous DTCs. Soak vehicle at ambient temperature for at least 8 hours. Turn ignition on, engine off. Using scan tool, monitor MAT and EOT PIDs. Record MAT sensor temperature reading. Drive vehicle while monitoring MAT sensor reading. Operate vehicle until it reaches normal operating temperature, EOT above 176°F. Idle vehicle for ten minutes. If MAT reading changed from value recorded at any time, go to next step. If MAT reading did not change from value recorded, replace MAT sensor. Clear DTCs and retest.

  10. 10) PCM Check

    Check continuous memory DTCs. If DTC P0096 is present, replace PCM. Clear DTCs and retest. If DTC P0096 is not present, fault cannot be duplicated at this time and testing is complete.
scientia non olet · About LEMON Manuals