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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 Aa: Idle Validation Switch >> Diagnostic Aids

Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1996 Ford RV Cutaway, 1996 Ford Pickup, 1996 Ford F-Super Duty, 1996 Ford Econoline, and 1996 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

  1. 1)

    Step 1) DTC 0221 Or 0220 This DTC indicates a malfunction has occurred in Idle Validation Switch (IVS) circuit. Possible causes for this DTC are:
    • Faulty accelerator pedal assembly.
    • Open circuit.
    • Short to power in IVS circuit.
    • Faulty Powertrain Control Module (PCM).

    Turn ignition off. Reconnect ICP sensor connector. Ensure scan tool is connected to Data Link Connector (DLC). Turn ignition on. Using scan tool, access AP and IVS PID from PID/DATA MONITOR & RECORD menu. If IVS PID reading indicates ON with accelerator pedal released, go to step  10). If IVS PID reading does not indicate ON with accelerator pedal released, go to next step.

  2. 2) Check IVS Transition Voltage

    Observe AP (voltage) and IVS (state) PID reading and slowly depress accelerator pedal. If IVS PID reading switches to ON at .4-1.6 volts, replace accelerator pedal assembly. Clear DTCs, and repeat QUICK TEST . If IVS PID does not switch to ON at .4-1.6 volts, go to next step.

  3. 3) Check IVS

    Observe IVS PID reading and fully depress accelerator pedal. If IVS PID reading switches to ON at any time, replace accelerator pedal assembly. Clear DTCs, and repeat QUICK TEST . If IVS PID does not switch to ON at any time, go to next step.

  4. 4) Check IVS Resistance

    Disconnect IVS and inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. If resistance is less than 5 ohms, go to step  8) (Econoline), or go to next step (Pickup). If resistance is 5 ohms or more, replace accelerator assembly. Clear DTCs, and repeat QUICK TEST .

  5. 5) Check Fuse No. 3 (3-Amp)

    Turn ignition on. Remove and inspect fuse No. 3 located in instrument panel fuse box. If fuse is okay, go to next step. If fuse is blown, determine cause of blown fuse and replace fuse. Clear DTCs, and repeat QUICK TEST .

  6. 6) Check Circuit No. 16

    Remove fuse No. 17 at power distribution box in engine compartment. Measure resistance between non-powered side of No. 17 fuse holder (Yellow wire) and power side of No. 3 fuse holder (Red/Light Green wire) If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair open circuit between fuse holders. Clear DTCs, and repeat QUICK TEST .

  7. 7) Check Circuit No. 276

    Turn ignition off. Measure resistance of Brown wire between non-powered side of No. 3 fuse holder and IVS wiring harness connector. If resistance is less than 5 ohms, go to step  9). If resistance is 5 ohms or more, locate and repair open circuit in Brown wire. Clear DTCs, and repeat QUICK TEST .

  8. 8) Check Resistance Of Red/Light Green Wire

    Turn ignition off. Ensure IVS connector is disconnected. Remove fuse "U" (30-amp) from power distribution box. Measure resistance between non-power side of fuse "U" and IVS harness connector terminal (Red/Light Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Red/Light Green wire between power distribution box and IVS. Clear DTCs, and repeat QUICK TEST .

  9. 9) Check Resistance Of Red/Orange Wire

    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 Red/Orange wire at IVS wiring harness connector and test pin No. 5 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 Red/Orange wire. Clear DTCs, and repeat QUICK TEST .

  10. 10) Check For Short To Power

    Disconnect IVS connector. If IVS PID reading indicates OFF, replace accelerator pedal assembly. Clear DTCs, and repeat QUICK TEST . If IVS PID does not indicate OFF, locate and repair short to power in Red/Orange wire between PCM and IVS wiring harness connector. Clear DTCs, and repeat QUICK TEST .
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