E067

ECM Code E067:

DFI Cruise Control Circuit:

DESCRIPTION:

When the cruise control ON/OFF switch is "ON", system voltage is available at one side of the normally open contacts on the Set/Coast and Resume/Accel switches. If the cruise control ON/OFF switch is in the "ON" position this system voltage is available to the Set/Coast and Resume/Accel switches at key on. If the Set/Coast or the Resume/Accel switches were stuck or their signal wires to the ECM were shorted to voltage, the vehicle could begin cruise operation. To prevent this, code E067 will set and disable cruise control if signal voltage from the Set/Coast (CKT 84) or Resume/Accel (CKT 87) is "HI" when the cruise control ON/OFF switch is turned from "OFF" to "ON" or when the ignition key is turned on with the cruise control ON/OFF switch "ON".

TEST CONDITIONS:

1. Always tested.

FAILURE CONDITIONS:

Set/Coast or Resume/Accel signal present when the cruise ON/OFF switch is turned "ON" or if Set/Coast and Resume/Accel switches are on at the same time.

ACTION TAKEN:

If PROM ID (ED99) is 861 or 862, disable cruise for complete ignition cycle. If PROM ID (ED99) is 1000 or 1001, disable cruise until failure conditions are not true.

NOTES ON FAULT TREE:

1. ECM inputs EI80 and EI81 display Set/Coast and Resume/Accel switch status as HI or LO depending on the voltage state at the ECM. If one of these inputs stays HI when the switches are cycled, that particular switch or signal wire is shorted to voltage.

2. This step checks to see if short circuit reading is due to switch or circuit.

NOTE ON INTERMITTENTS:

If an intermittent code E067 is being set manipulate the related wiring while observing ECM inputs EI80 and EI81. If the failure is induced the reading will jump from LO to Hi with the switch off (not depressed).

This code can be set by:

1. The operatorif the cruise ON/OFF switch is turned "ON" and the operator was depressing either the Set/Coast or Resume/Accel switches.
2. The ON/OFF switch was on when the ignition key is turned on and the operator was depressing either the Set/Coast or Resume/Accel switches.
3. Both the Set/Coast and Resume/Accel switches were pressed at the same time with the dash switch on.

Review the snapshot data parameters stored with this code to verify failure condition. If the failure condition is verified, check and repair intermittent wiring connection, or sensor.