DFI ECM Tests W/Codes: Action:

Cruise control disengaged for entire key cycle.

When cruise control "ON/OFF" switch is in the "ON" position, system voltage is available at one side of the normally open contacts of the "RESUME/ACCEL" and "SET/COAST" switches. If cruise control "ON/OFF" switch is in the "ON" position, with ignition on, system voltage is available to the "RESUME/ACCEL" and "SET/COAST" switches.

If switches are stuck or their signal wires to the ECM are shorted to voltage, the vehicle could begin cruise control operation. To prevent this, code EO67 will set and disable cruise control if signal voltage from "SET/COAST" switch (circuit No. 84) or "RESUME/ACCEL" switch (circuit No. 87) is high when cruise control "ON/OFF" switch is turned from "OFF" to "ON" position or when ignition is turned on and cruise control "ON/OFF" switch was left on. Cruise control will disable for one ignition cycle.

NOTE: Test numbers refer to test numbers on diagnostic chart.

ECM inputs EI83 and EI84 display "SET/COAST" and "RESUME/ACCEL" switch status as "HI" or "LO" depending on voltage state at ECM. If one of these inputs stays "HI" when switches are cycled, that particular switch or signal wire is shorted to voltage.
This step checks to see if short circuit reading is due to switch or circuit.