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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 K: Brake On/Off 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) DTC 0703: Check BOO PID

    Using scan tool, access BOO PID from PID/DATA MONITOR & RECORD menu. Turn ignition on. While observing PID, firmly depress and release brake pedal. If PID reading indicates ON only, go to next step. If PID reading does not indicate ON only, go to step  4).

  2. 2) Check BOO Switch

    Turn ignition on. Disconnect BOO switch connector. If BOO PID reading switched to OFF, replace BOO switch. Confirm repair using scan tool and accessing BOO PID from PID/DATA MONITOR & RECORD menu and with brakelight operation. Clear DTCs, and repeat QUICK TEST . If BOO PID reading did not switch to OFF, go to next step.

  3. 3) Check For Short To Power

    Turn ignition off. Disconnect PCM 104-pin connector. Turn ignition on. Measure voltage between ground and Light Green wire at BOO switch wiring harness connector. If battery voltage is present, locate and repair short to power in Light Green wire. Confirm repair using scan tool and accessing BOO PID from PID/DATA MONITOR & RECORD menu and with brakelight operation. Clear DTCs, and repeat QUICK TEST . If battery voltage is not present, short to battery voltage is at PCM terminal No. 92. Inspect PCM connector for damaged pins, corrosion and loose wires. Repair as necessary. Reconnect all connectors and go to step  11).

  4. 4) Check BOO PID

    If BOO PID reading indicates OFF only, go to step  6) (Econoline), or go to next step (Pickup). If BOO PID reading does not indicate OFF only, fault is intermittent. Go to step  13).

  5. 5) Check Fuse No. 13 (15-Amp)

    Remove and inspect fuse No. 13 from instrument panel fuse block. If fuse is okay, go to step  9) to check for open circuit. If fuse is blown, go to step  7) to check for short to ground.

  6. 6) Check Fuse No. 1 (15-Amp)

    Remove and inspect fuse No. 1 from instrument panel fuse block. If fuse is okay, go to step  9) to check for open circuit. If fuse is blown, go to next step to check for short to ground.

  7. 7) Check For Short to Ground

    Measure resistance between ground and Light Green/Red wire at BOO switch wiring harness connector. If resistance is less than 10 k/ohms, locate and repair short to ground in wiring harness between fuse block and BOO switch. Replace fuse and reconnect connectors. Confirm repair using scan tool and accessing BOO PID from PID/DATA MONITOR & RECORD menu and with brakelight operation. If resistance is 10 k/ohms or more, go to next step.

  8. 8) Check Circuit No. 511 For Short To Ground

    Disconnect PCM 104-pin connector. Measure resistance between ground and Light Green wire at BOO switch wiring harness connector. If resistance is less than 10 k/ohms, locate and repair short to ground in Light Green wire. Confirm repair using scan tool and accessing BOO PID from PID/DATA MONITOR & RECORD menu and with brakelight operation. If resistance is 10 k/ohms or more, short to ground is at PCM terminal No. 92. Inspect PCM connector for damaged pins, corrosion and loose wires. Repair as necessary. Reconnect all connectors and go to step  12).

  9. 9) Check For Open Circuit

    Ensure BOO switch is disconnected and fuse No. 1 (Econoline) or fuse No. 13 (Pickup) is removed. Measure resistance of Light Green/Red wire between BOO switch wiring harness connector and output side of appropriate fuse holder. If resistance is less than 5 ohms, circuit between BOO switch and fuse block is okay. Go to next step. If resistance is 5 ohms or more, locate and repair open in wiring harness between fuse block and BOO switch connector. Confirm repair using scan tool and accessing BOO PID from PID/DATA MONITOR & RECORD menu and with brakelight operation.

  10. 10) Check For Open BOO Switch

    Turn ignition on. Connect a jumper wire between BOO switch wiring harness connector terminals. Using scan tool, access BOO PID from PID/DATA MONITOR & RECORD menu. If PID reading indicates ON, replace BOO switch. Confirm repair using scan tool and accessing BOO PID from PID/DATA MONITOR & RECORD menu and with brakelight operation. If PID reading does not indicate ON, remove jumper wire and go to next step.

  11. 11) Check For Open In Circuit No. 511

    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. Turn ignition on. Measure resistance between Light Green at BOO switch wiring harness connector and test pin No. 92 at breakout box. If resistance is less than 5 ohms, reconnect all connectors and go to next step. If resistance is 5 ohms or more, locate and repair open circuit in Light Green wire. Confirm repair using scan tool and accessing BOO PID from PID/DATA MONITOR & RECORD menu and with brakelight operation.

  12. 12) Confirm PCM Fault

    Turn ignition on. Using scan tool, access BOO PID from PID/DATA MONITOR & RECORD menu. If PID reading switches from ON to OFF, no problem is indicated at this time. If PID reading does not switch from ON to OFF, replace PCM. Confirm repair using scan tool and accessing BOO PID from PID/DATA MONITOR & RECORD menu and with brakelight operation.

  13. 13) Check For Intermittent Open Or Short Circuit

    Ensure BOO switch is disconnected. Turn ignition on. Connect a jumper wire between BOO switch wiring harness connector terminals. Confirm BOO PID reading on scan tool indicates ON and brakelights also on. While observing BOO PID, wiggle/bend small sections of wiring harness starting at BOO switch connector and working toward PCM. If fault is indicated (PID changes to OFF), isolate fault in wiring harness and repair as necessary. Confirm repair using scan tool and accessing BOO PID from PID/DATA MONITOR & RECORD menu and with brakelight operation. If no fault is indicated, go to next step.

  14. 14) Check For Intermittent Short To Power

    Remove fuse No. 1 (Econoline), or No. 13 (Pickup). Confirm BOO PID reading on scan tool indicates OFF and brakelights also off. While observing BOO PID, wiggle/bend small sections of wiring harness starting at BOO switch connector and working toward PCM. If fault is indicated (PID changes to ON), isolate fault in wiring harness and repair as necessary. Confirm repair using scan tool and accessing BOO PID from PID/DATA MONITOR & RECORD menu and with brakelight operation. If no fault is indicated, fault cannot be duplicated at this time. Reconnect all connectors and confirm repair using scan tool and accessing BOO PID from PID/DATA MONITOR & RECORD menu and with brakelight operation. Repeat QUICK TEST .
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