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CRUISE CONTROL
VOLTAGE FROM THE BATTERY IS NORMALLY APPLIED TO TERMINAL 16 OF THE CRUISE CONTROL COMPUTER. WHEN THE
IGNITION SW IS TURNED TO ON, THE CURRENT FLOWING THROUGH THE ECU–IG FUSE FLOWS THEN TO TERMINAL 3 OF THE
CRUISE CONTROL MAIN SW. IF AT THIS TIME THE MAIN SW IS TURNED TO ON, THE CURRENT APPLIED TO TERMINAL 3 FLOWS
FROM THE POWER INDICATOR → TERMINAL 3 OF THE COMPUTER, CAUSING THE INDICATOR LIGHT TO LIGHT UP. AT THE SAME
TIME, CURRENT FLOWS TO TERMINAL 10 OF THE COMPUTER, MAINTAINING THE CRUISE CONTROL SYSTEM IN CONSTANT
READINESS FOR OPERATION.
1. CRUISE CONTROL DRIVING
WHEN THE MAIN SW IS TURNED TO ON AND THE SET SW IS PUSHED IN WITH THE VEHICLE SPEED WITHIN THE SET LIMIT
(APPROX. 40km/h, 25MPH TO 200km/h, 124MPH), A SIGNAL IS INPUT TO TERMINAL 5 OF THE COMPUTER AND THE VEHICLE SPEED
AT THAT TIME IS RECORDED IN THE COMPUTER MEMORY AS THE SET SPEED. THE COMPUTER COMPARES THE RECORDED SET
SPEED WITH THE ACTUAL VEHICLE SPEED INPUT INTO TERMINAL 7 FROM THE SPEED SENSOR, AND CONTROLS THE CRUISE
CONTROL ACTUATOR IN ORDER TO MAINTAIN THE SET VEHICLE SPEED.
WHEN THE ACTUAL VEHICLE SPEED IS LOWER THAN THE SET SPEED, COMPUTER OPERATION LENGTHENS THE PERIOD OF
CURRENT FLOW FROM TERMINAL 4 OF THE COMPUTER → TERMINAL 2 OF THE ACTUATOR → THE CONTROL VALVE → TERMINAL 3
→ TERMINAL 14 OF THE COMPUTER, THE CABLE IS PULLED IN THE DIRECTION FOR OPENING THROTTLE VALVE AND THE VEHICLE
SPEED INCREASES.
WHEN THE ACTUAL VEHICLE SPEED IS HIGHER THAN THE SET SPEED, A SHORTER PERIOD OF CURRENT FLOW TO THE CONTROL
VALVE RETURNS THE CABLE IN THE DIRECTION FOR CLOSING THE THROTTLE VALVE AND THE VEHICLE SPEED DECREASES.
<ACTUATOR OPERATION>
WHEN THE CRUISE CONTROL SYSTEM OPERATES (THE SET SIGNAL IS INPUT), CURRENT FLOWS FROM THE COMPUTER TO THE
RELEASE VALVE, CLOSING THE ATMOSPHERIC INTAKE PORT.
WHEN THERE IS CONTINUITY TO THE CONTROL VALVE, VACUUM IS INTRODUCED INSIDE THE ACTUATOR, AND WHEN THERE IS
NO CONTINUITY, VACUUM INTAKE STOPS AND ATMOSPHERE IS INTRODUCED. IN OTHER WORDS, THE ACTUATOR (THROTTLE
VALVE) IS CONTROLLED BY CHANGING THE RATIO OF CONTINUITY AND NON–CONTINUITY TO THE CONTROL VALVE WITHIN A
SPECIFIED PERIOD OF TIME.
<ROLE OF THE VACUUM SW AND VACUUM PUMP>
WHEN THE VACUUM SW TURNS ON DURING CRUISE CONTROL OPERATION, ITS SIGNAL IS INPUT TO TERMINAL 9 OF THE
COMPUTER SO THAT THE COMPUTER APPLIES CURRENT TO OPERATE THE VACUUM PUMP (TERMINAL 1 OF THE COMPUTER →
TERMINAL 1 OF THE PUMP → TERMINAL 2 → GROUND) AND SUPPLEMENT THE ENGINE VACUUM WHICH BY ITSELF IS INADEQUATE
FOR CONTROL.
2. CANCEL MECHANISM
IF ANY OF THE FOLLOWING OPERATIONS IS PERFORMED DURING CRUISE CONTROL, THEN CONTINUITY TO THE CONTROL VALVE
AND THE RELEASE VALVE IS CUT OFF AND CRUISE CONTROL IS RELEASED:
∗ DEPRESSING THE CLUTCH PEDAL (CLUTCH SW ON), SIGNAL INPUT TO TERMINAL 11 OF THE COMPUTER.
∗ PLACING THE NEUTRAL START SW IN “N” RANGE (NEUTRAL START SW ON), SIGNAL INPUT TO TERMINAL 11 OF THE COMPUTER.
∗ DEPRESSING THE BRAKES PEDAL (STOP LIGHT SW ON), SIGNAL INPUT TO TERMINAL 15 OF THE COMPUTER.
∗ PULLING THE PARKING BRAKE LEVER (PARKING BRAKE SW ON), SIGNAL INPUT TO TERMINAL 12 OF THE COMPUTER.
3. COAST CONTROL
WHILE THE COAST SW IS ON DURING CRUISE CONTROL, CURRENT FLOW TO THE CONTROL VALVE AND RELEASE VALVE IS
STOPPED AND THE VEHICLE DECELERATES UNTIL THE SW IS RELEASED. THE VEHICLE SPEED WHEN THE SW IS RELEASED IS
THEN RECORDED IN MEMORY.
4. RESUME CONTROL
BY TURNING THE RESUME SW TO ON AFTER CANCELLATION OF THE CRUISE CONTROL SYSTEMS, THE VEHICLE SPEED WILL
RETURN TO THE SPEED SET BEFORE CANCELLATION, PROVIDED THAT THE VEHICLE SPEED IS WITHIN THE SET LIMITS.
5. ACCEL CONTROL
WHEN THE ACCEL SW IS TURNED TO ON DURING CRUISE CONTROL DRIVING, CURRENT CONTINUES TO FLOW TO THE CONTROL
VALVE AND THE VEHICLE ACCELERATES. THE VEHICLE SPEED WHEN THE SW IS TURNED OFF IS RECORDED IN MEMORY.
(A) CRUISE CONTROL COMPUTER
(DISCONNECT THE COMPUTER CONNECTOR)
2–14 : APPROX. 68 (ACTUATOR RELEASE VALVE)
4–14 : APPROX. 30 (ACTUATOR CONTROL VALVE)
5–GROUND : CONTINUITY WITH SET, COAST SW ON
7–GROUND : 1 PULSE EACH 40 CM (DRIVE VEHICLE SLOWRY)
11–GROUND: CONTINUITY WITH CLUTCH PEDAL DEPRESSED (M/T) OR SHIFT LEVER IN N OR P RANGE (A/T)
(ONE OF THE CANCEL SW)
12–GROUND: CONTINUITY WITH PKB LEVER PULL UP (ONE OF THE CANCEL SW) OR BRAKE FLUID LEVEL WARNING SW ON
13–GROUND: ALWAYS CONTINUITY
17–GROUND: CONTINUITY WITH RESUME, ACCEL SW ON
10–GROUND: APPROX. 12 VOLTS WITH IGNITION SW ON AND CRUISE CONTROL MAIN SW ON
15–GROUND: APPROX. 12 VOLTS WITH BRAKE PEDAL DEPRESSED (ONE OF THE CANCEL SW)
16–GROUND: ALWAYS APPROX. 12 VOLTS
SYSTEM OUTLINE
SERVICE HINTS