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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 L: Malfunction Indicator Light >> 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) Check MIL Fault

    If any KOEO or Continuous Memory DTCs are present, service DTCs prior to continuing with this test. If MIL is always illuminated, go to next step. If MIL is not always illuminated, go to step  3).

  2. 2) Check Circuit No. 659 For Short To Ground

    Turn ignition off. Disconnect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Turn ignition on. If MIL is illuminated, locate and repair short to ground in circuit No. 658 (Pink/Light Green wire). Reconnect all connectors and repeat QUICK TEST . If MIL is off, replace PCM. Reconnect all connectors and repeat QUICK TEST .

  3. 3) MIL Always Off

    Disconnect Manifold Absolute Pressure (MAP) sensor. Start engine. If MIL is illuminated, no problem is indicated at this time. Reconnect MAP sensor and clear DTCs. If MIL is off, reconnect MAP sensor, turn engine off and go to next step.

  4. 4) Check Ignition Feed Circuit

    Turn ignition on. Measure voltage between ground and power side of fuse No. 18 (Econoline), or No. 17 (Pickup) holder (Red Light Green wire) at instrument panel fuse block. If battery voltage is present, go to next step. If battery voltage is not present, locate and repair open circuit in Red/Light Green wire or replace defective ignition switch. Clear DTCs, and repeat QUICK TEST .

  5. 5) Check Fuse

    Remove and inspect fuse No. 18 (Econoline), or No. 17 (Pickup). If fuse is okay, go to next step. If fuse is blown, locate and repair short to ground in Red/Yellow wire. Replace fuse. Clear DTCs, and repeat QUICK TEST .

  6. 6) Check For Open In Circuit No. 640

    Ensure fuse No. 18 (Econoline), or No. 17 (Pickup) is removed. Remove MIL bulb. Measure resistance of Red/Yellow wire between non-powered side of fuse holder and MIL bulb socket. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair open circuit in Red/Yellow wire. Reconnect all components, clear DTCs and repeat QUICK TEST .

  7. 7) Check MIL Bulb

    Check MIL bulb. If bulb is okay, go to next step. If bulb is bad, replace bulb. Clear DTCs and check MIL operation.

  8. 8) Check Circuit No. 658

    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 Pink/Light Green wire at MIL bulb socket and test pin No. 2 at breakout box. If resistance is less than 5 ohms, circuit No. 658 is okay. Replace PCM. Check MIL operation. If resistance is 5 ohms or more, locate and repair open circuit in Pink/Light Green wire. Reconnect all components, clear DTCs and check MIL operation.
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