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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 F: Speed Control Command 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.
    NOTE: When performing KOER SWITCH SELF-TEST , wait 5 seconds after pressing trigger before running through driver operated controls. Test may take up to 5 minutes to complete.

  1. 1) DTC 0565, 0566, 0567, 0568 Or 0569: Speed Control
    DTC 0565, 0566, 0567, 0568 Or 0569 will set if PCM does not detect when switch has been pressed during KOER SWITCH SELF-TEST . Possible causes for these faults are:
    • Switch not depressed during test.
    • Faulty speed control switch.
    • Faulty SCCS circuit.
    • Open or short in SC GND circuit.
    • Open in power supply circuit.

    With scan tool connected, turn ignition on. Access SCCS PID from PID/DATA MONITOR & RECORD menu on tester. DO NOT depress any switches. If voltage is 10 volts, go to step  5). If voltage is zero volts, go to step  8). If voltage is 6.58-6.78 volts, go to next step.

  2. 2) ON Switch Function Check

    Depress ON switch. If voltage is 10 volts, go to next step. If voltage is not 10 volts, go to step  20) (Econoline), or step  11) (Pickup).

  3. 3) OFF Switch Function Check

    Depress OFF switch. If voltage is zero volts, go to next step. If voltage is not zero volts, go to step  31) (Econoline W/air bag), or step  17) (Pickup and Econoline W/O air bag).

  4. 4) Command Switches Function

    Depress RESUME, COAST and SET/ACCEL switches. Observe voltage reading on scan tool as each switch is depressed. Compare readings with specification. See SPEED CONTROL COMMAND SWITCH PID SPECIFICATIONS  table. If voltage reading agrees with voltage specification, repeat QUICK TEST . If DTC is still present, replace PCM. If any voltage reading does not agree with voltage specification, replace speed control switch assembly. Clear DTCs, and repeat QUICK TEST .
    SPEED CONTROL COMMAND SWITCH PID SPECIFICATIONS

    Switch Volts
    Coast .48-.88
    Set/Accel 2.54-2.94
    Resume 4.46-4.86

  5. 5) Check For Shorted Command Switch

    Remove horn pad. Disconnect speed control switch 3-pin connector. If voltage reading is 6.58-6.78 volts, switch assembly is shorted. Replace speed control switch assembly. If voltage reading is not 6.58-6.78 volts, go to next step.

  6. 6) Check Sliding Contact (Clockspring)

    Disconnect steering column 10-pin wiring harness connector. Connector is located below steering column. If voltage reading is 6.58-6.78 volts, clockspring is shorted to power. Replace clockspring. Clear DTCs and repeat QUICK TEST . If voltage reading is not 6.58-6.78 volts, go to next step.

  7. 7) Signal Circuit Check

    Turn ignition off. Ensure steering column connector and speed control switch 3-pin connector are 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. Turn ignition on. Measure voltage between ground and test pin No. 61 at breakout box. If voltage reading is zero volts, replace PCM. Clear DTCs and repeat QUICK TEST . If voltage reading is not zero volts, locate and repair short to power in Light Blue/Black wire. Repeat QUICK TEST .

  8. 8) Check For Shorted Command Switch

    Remove horn pad. Disconnect speed control switch 3-pin connector. If voltage is 6.58-6.78 volts, clockspring wiring harness in steering column is shorted to ground. Replace clockspring. Clear DTCs and repeat QUICK TEST . If voltage is not 6.58-6.78 volts, go to next step.

  9. 9) Check Sliding Contact (Clockspring)

    Disconnect steering column 10-pin wiring harness connector. Connector is located below steering column. If voltage reading is 6.58-6.78 volts, clockspring and wiring harness in steering column are shorted to ground. Replace clockspring. Clear DTCs and repeat QUICK TEST . If voltage reading is not 6.58-6.78 volts, go to next step.

  10. 10) Signal Circuit Check

    Turn ignition off. Ensure steering column connector 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 test pin No. 61 and test pins No. 25, 51, 76, 77 and 103 at breakout box. If each reading is more than 10 k/ohms, replace PCM. Clear DTCs and repeat QUICK TEST . If any reading is 10 k/ohms or less, locate and repair short to ground in Light Blue/Black wire. Clear DTCs and repeat QUICK TEST .

  11. 11) Check Fuse

    Remove and inspect No. 3 fuse (15-amp) from power distribution center in engine compartment. If fuse is okay, go to next step. If fuse is blown, check for cause of blown fuse. Repair as necessary and replace fuse. Clear DTCs and repeat QUICK TEST .

  12. 12) Check Continuity From Fuse To Horn Pad

    Remove horn pad. Disconnect 3-pin speed control switch connector. Remove No. 3 fuse from power distribution center. Measure resistance between non-powered side of No. 3 fuse holder and Dark Blue wire at speed control switch 3-pin connector. If resistance is less than 75 ohms, go to step  14). If resistance is 75 ohms or more, go to next step.

  13. 13) Check Clockspring Resistance

    Disconnect steering column 10-pin wiring harness connector. Connector is located below steering column. Measure resistance of Dark Blue wire between 3-pin speed control switch connector and 10-pin connector (steering column side of connector). If resistance less than 5 ohms, locate and repair open circuit between fuse No. 3 and steering column connector. Clear DTCs and repeat QUICK TEST . If resistance is 5 ohms or more, replace clockspring. Clear DTCs and repeat QUICK TEST .

  14. 14) Check Speed Control Switch

    Remove horn pad. Depress On switch. Measure resistance between Dark Blue wire and Light Blue/Black wire at speed control switch 3-pin connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace speed control switch assembly. Clear DTCs and repeat QUICK TEST .

  15. 15) Check Clockspring

    Disconnect speed control switch 3-pin connector. Measure resistance of Light Blue/Black wire between 3-pin connector and steering column 10-pin connector. If resistance less than 5 ohms, go to next step. If resistance 5 ohms or more, locate and repair open circuit in Light Blue/Black wire. Clear DTCs and repeat QUICK TEST .

  16. 16) Check Circuit No. 151

    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. Disconnect steering column 10-pin wiring harness connector. Connector located below steering column. Measure resistance between test pin No. 61 at breakout box and terminal No. 5 (Light Blue/Black wire) at steering column 10-pin wiring harness connector. If resistance less than 5 ohms, replace PCM. Clear DTCs and repeat QUICK TEST . If resistance is 5 ohms or more, replace clockspring. Clear DTCs and repeat QUICK TEST .

  17. 17) Check Switch Ground

    Remove horn pad. Turn ignition on. Disconnect speed control switch 3-pin connector. Measure voltage between terminals "A" and "C" at clockspring side of speed control switch 3-pin connector. See Figure. If battery voltage is present, replace speed control switch assembly. Clear DTCs and repeat QUICK TEST . If battery voltage is not present, go to next step.

  18. 18) Check For Open Clockspring Circuit

    Disconnect steering column 10-pin wiring harness connector. Connector is located below steering column. Measure resistance of Dark Green/Orange wire between terminal "A" at speed control switch 3-pin connector and terminal No. 2 at steering column 10-pin connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace clockspring. Clear DTCs and repeat QUICK TEST .

  19. 19) Check For Open Circuit

    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 Dark Green/Orange wire at terminal No. 2 of steering column 10-pin connector and test pin No. 40 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 Dark Green/Orange wire. Clear DTCs and repeat QUICK TEST .

  20. 20) Check Fuse

    Remove and inspect fuse "R" (15-amp) from power distribution center in engine compartment. If fuse is okay, go to next step (Econoline W/air bag), or step  26) (Econoline W/O air bag). If fuse is blown, check for cause of blown fuse. Repair as necessary and replace fuse. Clear DTCs and repeat QUICK TEST .

  21. 21) Check Continuity From Fuse "R" To Horn Pad

    Remove horn pad. Disconnect 3-pin speed control switch connector. Remove fuse "R" from power distribution center. Measure resistance between non-powered side of fuse "R" holder and Yellow/Light Blue wire at speed control switch 3-pin connector. If resistance is less than 75 ohms, go to next step. If resistance is 75 ohms or more, go to step  25).

  22. 22) Check Speed Control Switch

    Depress speed control On switch. Measure resistance between Yellow/Light Blue wire and Light Blue/Black wire at speed control switch 3-pin connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace speed control switch assembly. Clear DTCs and repeat QUICK TEST .

  23. 23) Check For Open Circuit

    Turn ignition off. Disconnect steering column 10-pin wiring harness connector. Connector is located below steering column. Measure resistance between terminal No. 5 (Light Blue/Black wire) at 10-pin wiring harness connector and test pin No. 61 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/Black wire. Clear DTCs and repeat QUICK TEST .

  24. 24) Check Clockspring

    Disconnect speed control switch 3-pin connector. Measure resistance of Light Blue/Black wire between 3-pin connector and terminal No. 5 at steering column 10-pin connector. If resistance is less than 5 ohms, replace PCM. Clear DTCs and repeat QUICK TEST . If resistance is 5 ohms or more, replace clockspring. Clear DTCs and repeat QUICK TEST .

  25. 25) Check Clockspring Resistance

    Disconnect steering column 10-pin connector. Measure resistance of Yellow/Light Blue wire between 3-pin connector and terminal No. 6 at steering column 10-pin connector (steering column side). If resistance is less than 5 ohms, locate and repair open circuit between fuse "R" and steering column 10-pin wiring harness connector. Clear DTCs and repeat QUICK TEST . If resistance is 5 ohms or more, replace clockspring. Clear DTCs and repeat QUICK TEST .

  26. 26) Check For Continuity Between Horn Pad & Fuse "R"

    Remove horn pad. Disconnect speed control switch 3-pin connector. Measure resistance of Yellow/Light Blue wire between non-powered side of fuse "R" holder and terminal "C" speed control switch 3-pin connector (clockspring side). If resistance is less than 75 ohms, go to next step. If resistance 75 ohms or more, go to step  30).

  27. 27) Check Speed Control Switch

    Depress speed control On switch. Measure resistance between Yellow/Light Green wire and Light Blue/Black wire at speed control switch 3-pin connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace speed control switch assembly. Clear DTCs and repeat QUICK TEST .

  28. 28) Check For Open Circuit

    Turn ignition off. Disconnect steering column 10-pin wiring harness connector. Connector is located below steering column. Measure resistance between terminal No. 5 (Light Blue/Black wire) at 10-pin wiring harness connector and test pin No. 61 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/Black wire. Clear DTCs and repeat QUICK TEST .

  29. 29) Check Clockspring Contact

    Disconnect speed control switch 3-pin connector. Measure resistance of Light Blue/Black wire between 3-pin connector and terminal No. 5 at steering column 10-pin connector. If resistance is less than 5 ohms, replace PCM. Clear DTCs and repeat QUICK TEST . If resistance is 5 ohms or more, replace clockspring. Clear DTCs and repeat QUICK TEST .

  30. 30) Check Clockspring Resistance

    Disconnect steering column 10-pin connector. Measure resistance of Yellow/Light Green wire between 3-pin connector and terminal No. 6 at steering column 10-pin connector (steering column side). If resistance is less than 5 ohms, locate and repair open circuit between fuse "R" and steering column 10-pin wiring harness connector. Clear DTCs and repeat QUICK TEST . If resistance is 5 ohms or more, replace clockspring. Clear DTCs and repeat QUICK TEST .

  31. 31) Ground Check At Switch

    Remove horn pad. Turn ignition on. Disconnect 3-pin speed control switch harness connector. Measure voltage between Black wire and Yellow/Light Blue wire at speed control switch 3-pin connector. If battery voltage is present, replace faulty speed control switch assembly. Clear DTCs and repeat QUICK TEST . If battery voltage is not present, go to next step.

  32. 32) Check For Open In Air Bag Sliding Contact

    Ensure 3-pin speed control switch harness connector is disconnected. Disconnect steering column 10-pin connector. Measure resistance of Black wire between 3-pin speed control switch harness connector and steering column 10-pin connector. If resistance is less than 5 ohms, go to next step. if resistance is 5 ohms or more, replace faulty air bag sliding contact.

  33. 33) Check For Open In Orange/Yellow Wire)

    Ensure ignition is off. Disconnect PCM 104-pin connector. Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance of Orange/Yellow wire between steering column 10-pin harness connector and test Pin 40 at breakout box. If resistance is less than 5 ohms, replace faulty PCM. Clear DTCs and repeat QUICK TEST . If resistance is 5 ohms or more, repair open in Orange/Yellow wire between PCM and steering column 10-pin harness connector.
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