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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 DF: Camshaft Position Sensor >> Testing

Test DF: Camshaft Position Sensor: Testing

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

Fault Code KOEO KOER Continuous Memory
P0340 Test DF  , Step  1)   Test DF  , Step  1)
P0341
All except F650-750 (1)   Test DF  , Step  1) Test DF  , Step  1)
F650-750   Test DF  , Step  1) Test DF  , Step  1)
P0344
All except F650-750 (1)(2) Test DF  , Step  1)   Test DF  , Step  1)
F650-750 Test DF  , Step  1)   Test DF  , Step  1)
(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 P0340, P0341 & P0344: Clear & Attempt To Regenerate DTC
    Ensure scan tool is connected to Data Link Connector (DLC). Clear continuous DTCs. Using scan tool, access RPM PID from PID/DATA MONITOR & RECORD menu. Crank engine while monitoring RPM PID. If RPM PID indicates cranking RPM, go to next step. If RPM PID does not indicate cranking RPM, go to step  3).

  2. 2) Check For DTC P0341 Or P0344

    Start and run engine until coolant is at normal operating temperature. Raise engine speed to 3300 RPM (2500 RPM for F650-750) for 2 minutes. Cycle ignition off, then on. Check for DTCs. If DTC P0341 or P0344 is present, go to next step. If DTC P0341 or P0344 is not present, go to step  12).

  3. 3) Check CMP SIG RTN Circuit

    Turn ignition off. Disconnect CMP sensor connector. Sensor is located on right front of engine, above crankshaft pulley. See Figure or Figure . Using DVOM, measure resistance between chassis ground and CMP sensor harness connector terminal "A" (Light Blue wire). See Figure. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step  9).

  4. 4) Check CMP Circuit For VREF

    Turn ignition on. Using DVOM, measure voltage between chassis ground and CMP sensor harness connector terminal "B" (Brown/White wire). If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, repair VREF circuit as necessary. Go to TEST C: REFERENCE VOLTAGE .

  5. 5) Check CMP Circuit For Short To Battery PWR (PCM Connected)

    Using DVOM, measure voltage between chassis ground and CMP sensor harness connector terminal "C" (Dark Green wire). If battery voltage is present, go to next step. If battery voltage is not present, go to step  7).

  6. 6) Check CMP Circuit For Short To Battery PWR (PCM Disconnected)

    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. Turn ignition on. Using DVOM, measure voltage between chassis ground and CMP sensor harness connector terminal "C" (Dark Green wire). If battery voltage is present, locate and repair short to voltage in Dark Green wire. Clear DTCs and retest. If battery voltage is not present, replace CMP sensor. Clear DTCs and retest.

  7. 7) Check CMP Circuit 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. Using DVOM, measure resistance between chassis ground and CMP sensor harness connector terminal "C" (Dark Green wire). If resistance is less than 5 ohms, locate and repair short to ground in Dark Green wire. Clear DTCs and retest. If resistance is 5 ohms or more, go to next step.

  8. 8) Check CMP Circuit For Open

    Install Rotunda Breakout Box (014-00950), leaving PCM disconnected. Using DVOM, measure resistance of Dark Green wire between CMP sensor harness connector terminal "C" and test pin No. 21 at breakout box. If resistance is less than 5 ohms, an open circuit exists at PCM terminal No. 21. Inspect PCM connector and inspect for damaged pins, corrosion and loose wires. Repair as necessary, reconnect all components and go to step  11). If resistance is 5 ohms or more, repair open in Dark Green wire. Clear DTCs and retest.

  9. 9) Check For Open In CMP GND Circuit

    Ensure ignition is off and CMP sensor is disconnected. 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 of Light Blue wire between CMP sensor harness connector terminal "A" and test pin No. 65 at breakout box. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Blue wire between PCM and CMP sensor. Clear DTCs and retest.

  10. 10) Check For CMP Sensor Ground Through PCM

    Connect PCM to breakout box. Using DVOM, measure resistance between chassis ground and test pins No. 25, 51, 76 (Econoline), 77 and 103 at breakout box. If all resistances are less than 5 ohms, PCM internal ground is not supplied to terminal No. 65. Reconnect all components and go to next step. If any resistance is 5 ohms or more, repair open in ground circuit. See WIRING DIAGRAMS . Clear DTCs and retest.

  11. 11) Confirm PCM Fault

    Repeat steps  1) and  2). If fault is still present, replace PCM. Clear DTCs and retest. If fault is not present, no concern is indicated at this time. Testing is complete.

  12. 12) Check For Intermittent

    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) and connect PCM. To prevent vehicle from starting, disconnect Injector Driver Module (IDM) relay. Relay is located in battery junction box on left front of engine compartment. Connect DVOM between test pin No. 65 and test pin No. 21 at breakout box. Rotate crankshaft (by hand) until voltage toggles from battery voltage to .3-2.7 volts. If lower voltage reading is .3-2.7 volts, leave DVOM connected to test pins and go to next step. If lower voltage reading is not .3-2.7 volts, go to step  3).

  13. 13) Check Wiring Harness

    With DVOM still connected between test pins No. 21 and 65, rotate crankshaft (by hand) until voltage stays at .3-2.7 volts. While observing DVOM, wiggle wiring harness. If voltage reading jumps to battery voltage or goes to zero volts, locate and repair intermittent in wiring harness. Clear DTCs and retest. If voltage reading does not jump to battery voltage or go to zero volt, no concern is indicated at this time. Clear DTCs and retest.
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