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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 G: Camshaft Position Sensor >> Diagnostic Aids

Diagnostic Aids

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  1. 1) DTC 0340, 0341 & 0340: Clear Memory & Attempt To Regenerate DTC

    Ensure scan tool is connected to Data Link Connector (DLC). See VEHICLE PREPARATION & EQUIPMENT HOOKUP  under QUICK TEST. Clear continuous DTCs. Using scan tool, access RPM PID from PID/DATA MONITOR & RECORD menu. Crank engine while monitoring RPM PID. If PID indicates cranking RPM, go to next step. If PID does not indicate cranking RPM, go to step  3).

  2. 2) Check For DTC 0344 Or 0341

    Start and run engine until coolant is at normal operating temperature. Raise engine speed to 3300 RPM for 2 minutes. Turn ignition off. Check for Continuous Memory DTCs. If DTC 0344 or 0341 is set, go to next step. If DTC 0344 or 0341 is not set, fault is intermittent. Go to step  12).

  3. 3) Check CMP Signal

    Turn ignition off. Disconnect CMP sensor connector. Measure resistance between ground and terminal "A" (Light Blue wire) at CMP sensor wiring harness connector. 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 No. 351

    Turn ignition on. Measure voltage between ground and terminal "B" (Brown/White wire) at CMP sensor wiring harness connector. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, VREF circuit is defective. Go to TEST B, step  1).

  5. 5) Check CMP Circuit No. 795

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

  6. 6) Check For Short To Power

    Turn ignition off. Disconnect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Turn ignition on. Measure voltage between ground and terminal "C" (Dark Green wire) at CMP sensor wiring harness connector. If battery voltage is present, locate and repair short to power in Dark Green wire. Confirm repair using scan tool and accessing RPM PID from PID/DATA MONITOR & RECORD menu and by repeating steps  1) and  2) . If battery voltage is not present, replace CMP sensor.

  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. Measure resistance between ground and terminal "C" (Dark Green wire) at CMP sensor wiring harness connector. If resistance is less than 5 ohms, locate and repair short to ground in Dark Green wire. Confirm repair using scan tool and accessing RPM PID from PID/DATA MONITOR & RECORD menu and by repeating steps  1) and  2) . If resistance is 5 ohms or more, go to next step.

  8. 8) Check For Open Circuit

    Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between Dark Green wire at CMP sensor wiring harness connector and test pin at breakout box. If resistance less than 5 ohms, an open circuit exists at PCM terminal No. 49. Inspect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Reconnect all components and go to step  11). If resistance 5 ohms or more, locate and repair open circuit in Dark Green wire. Confirm repair using scan tool and accessing RPM PID from PID/DATA MONITOR & RECORD menu and by repeating steps  1) and  2) .

  9. 9) Check For Open In CMP Sensor Ground Circuit

    Turn ignition off. Ensure CMP sensor is disconnected. 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 Light Blue wire at CMP sensor wiring harness connector 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, locate and repair open circuit in Light Blue wire. Confirm repair using scan tool and accessing RPM PID from PID/DATA MONITOR & RECORD menu and by repeating steps  1) and  2) .

  10. 10) Check For CMP Sensor Ground Through PCM

    Connect PCM to breakout box. Measure resistance between ground and test pins No. 25, 51, 76, 77 and 103. If all readings 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 reading is 5 ohms or more, locate and repair open in ground circuit. Confirm repair using scan tool and accessing RPM PID from PID/DATA MONITOR & RECORD menu and by repeating steps  1) and  2) .

  11. 11) Confirm PCM Fault

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

  12. 12) Check For Intermittent

    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) and connect PCM. To prevent vehicle from starting, disconnect Injector Driver Module (IDM) relay. Relay is located in power distribution center in engine compartment. Connect DVOM between test pins No. 49 and 65 at breakout box. Rotate crankshaft (by hand) until voltage toggles from battery voltage to .3-2.7 volts. If lower voltage reading .3-2.7 volts, go to next step. If lower voltage reading not .3-2.7 volts, go to step  3).

  13. 13) Check Wiring Harness

    Rotate crankshaft (by hand) until voltage stays at .3-2.7 volts. While observing DVOM, wiggle wiring harness. If a fault occurs, voltage reading will jump to battery voltage or zero volt. If fault occurs, locate and repair intermittent in wiring harness. Confirm repair using scan tool and accessing RPM PID from PID/DATA MONITOR & RECORD menu and by repeating steps  1) and  2) . If no fault occurs, no problem is indicated at this time. Repeat steps  1) and  2) .
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