Cruise Control tests for Ford EEC IV equipped vehicles

WARNING! FOLLOW STANDARD SAFETY PRACTICES WHEN WORKING ON A VEHICLE INCLUDING BUT NOT LIMITED TO: Transmission in Park or Neutral and the driven wheels off the ground or chocked when cranking/running the engine.
Check fan blade for cracks and do not stand next to the fan when running.
Use caution when working on fuel systems, which can remain pressurized for a long period after the key is turned off.
No smoking around fuel.
Watch for electric fan which can come on at any time.
Watch out for hot and/or moving parts.
Watch out for high voltage secondary circuits.
If you are not sure of the safety of any operation DO NOT DO IT. ASK SOMEONE!
The author assumes no responsibility for the safety of anyone using these documents.



NOTES: These tests are only available on vehicles with processor controlled cruise control systems (Taurus/Sable, some Lincoln, Crown Victoria, Grand Marquis, Thunderbird and Cougar models). These tests will not test the speed sensor. Usually there will be a regular EEC code if it is bad.

[EEC Tester hookups]

Key On Engine Off (KOEO) test:

1. Hook a tester up to the EEC IV connector, but leave the trigger unplugged (or test switch off on some testers). Try to position the tester or light so you can see it from the driver's seat.

2. Turn key to run, and within 10 seconds press the cruise control ON button.

3. One pulse should be output to indicate the test is in progress.

4. Press in sequence: cruise control OFF, COAST, ACCEL, and RESUME buttons. Tap the brake pedal once to light the brake lamps.

5. Codes will be output (11 is a pass).

Key On Engine Running (KOER) test:

Make sure the vehicle is safe to run (see precautions at the beginning of this document).

1. Hook up per KOEO test above.

2. Start engine and within 30 seconds, press the cruise control ON button.

3. Within 15 seconds, hook up the test trigger (or move the switch on some testers).

4. One pulse should be output indicating the test is in progress.

5. Code(s) will be output after test is finished (11 is a pass).

Speed sensor:

If the cruise control passes the self tests but still does not work, check the speed sensor and circuit, or substitute a new one.

Copyright 1987-1996 Dali Design jthorsse@mail.bcpl.lib.md.us

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