Cruise Control System

DIAGNOSTIC TROUBLE CODE 31, 32 AND 33 (VACUUM PUMP, AIR VALVE, RELEASE VALVE)

DIAGNOSIS:
Open or poor contact of vacuum pump motor, air valve and release valve.

TROUBLE SYMPTOM:
Cruise control cannot be set. (Cancels immediately.)

Wiring Diagram:

WIRING DIAGRAM

8F1: MEASURE RESISTANCE OF VACUUM PUMP MOTOR, AIR VALVE AND RELEASE VALVE.

1. Disconnect connector from vacuum pump and valve.




2. Measure resistance of vacuum pump motor, air valve and release valve.

CHECK: Is resistance approximately 46 Ohm?

YES: Go to step 8F2.

NO: Replace vacuum pump and valve.

8F2: MEASURE RESISTANCE OF VACUUM PUMP MOTOR, AIR VALVE AND RELEASE VALVE.




Measure resistance of vacuum pump motor, air valve and release valve.

CHECK: Is resistance approximately 69 Ohm?

YES: Go to step 8F3.

NO: Replace vacuum pump and valve.

8F3: MEASURE RESISTANCE OF VACUUM PUMP MOTOR, AIR VALVE AND RELEASE VALVE.




Measure resistance of vacuum pump motor, air valve and release valve.

CHECK: Is resistance approximately 69 Ohm?

YES: Go to step 8F4.

NO: Replace vacuum pump and valve.

8F4: PERFORM A CIRCUIT TEST IN HARNESS BETWEEN VACUUM PUMP & VALVE AND CRUISE CONTROL MODULE.

1. Disconnect connector from cruise control module.




2. Measure resistance of harness connector between cruise control module, vacuum pump motor, air valve and release valve.

CHECK: Is resistance less than 10 Ohm?

YES: Go to step 8F5.

NO: Repair or replace wiring harness between vacuum pump & valve and cruise control module.

8F5: PERFORM A CIRCUIT TEST IN HARNESS BETWEEN VACUUM PUMP & VALVE AND CRUISE CONTROL MODULE.




Measure resistance of harness connector between cruise control module, vacuum pump motor, air valve and release valve.

CHECK: Is resistance less than 10 Ohm?

YES: Go to step 8F6.

NO: Repair or replace wiring harness between vacuum pump & valve and cruise control module.

8F6: PERFORM A CIRCUIT TEST IN HARNESS BETWEEN VACUUM PUMP & VALVE AND CRUISE CONTROL MODULE.




Measure resistance of harness connector between cruise control module, vacuum pump motor, air valve and release valve.

CHECK: Is resistance less than 10 Ohm?

YES: Go to step 8F7.

NO: Repair or replace wiring harness between vacuum pump & valve and cruise control module.

8F7: PERFORM A CIRCUIT TEST IN HARNESS BETWEEN VACUUM PUMP & VALVE AND CRUISE CONTROL MODULE.




Measure resistance of harness connector between cruise control module, vacuum pump motor, air valve and release valve.

CHECK: Is resistance less than 10 Ohm?

YES: Replace cruise control module.

NO: Repair or replace wiring harness between vacuum pump & valve and cruise control module.

9. Diagnostics Chart with Select Monitor