Lexus ES300 (1997 year). Manual - part 644

170

CRUISE CONTROL

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FROM POWER SOURCE SYSTEM (SEE PAGE 56)

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CRUISE CONTROL ECU

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171

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

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ENGINE CONTROL MODULE

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CRUISE CONTROL ECU

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172

CRUISE CONTROL

CURRENT IS APPLIED AT ALL TIMES THROUGH THE STOP FUSE TO TERMINAL 2 OF THE STOP LIGHT SW, AND ALSO THROUGH
THE ECU–B FUSE TO TERMINAL 1 OF THE CRUISE CONTROL ECU.
WITH THE IGNITION SW TURNED TO ON, CURRENT FLOWS THROUGH THE GAUGE FUSE TO TERMINAL      3 OF THE
COMBINATION METER AND THE CURRENT THROUGH THE ECU–IG FUSE FLOWS TO TERMINAL 9 OF THE CRUISE CONTROL ECU.
WHEN THE IGNITION SW IS ON AND THE CRUISE CONTROL MAIN SWITCH IS TURNED ON, A SIGNAL IS INPUT FROM TERMINAL 5
OF THE CRUISE CONTROL SW TO TERMINAL 11 OF THE CRUISE CONTROL ECU. AS A RESULT, THE CRUISE CONTROL ECU
FUNCTIONS AND THE CURRENT FLOWS FROM THE ECU–IG FUSE TO TERMINAL 9 OF THE CRUISE CONTROL ECU 

→

 TERMINAL

16 

→

 GROUND, AND THE CRUISE CONTROL IS READY FOR OPERATION.

AT THE SAME TIME, THE CURRENT THROUGH THE GAUGE FUSE FLOWS TO TERMINAL      3 OF THE CRUISE CONTROL
INDICATOR LIGHT 

→

 TERMINAL      4 

→

 TERMINAL 4 OF THE CRUISE CONTROL ECU 

→

 TERMINAL 16 

→

 GROUND, CAUSING THE

CRUISE CONTROL INDICATOR LIGHT TO LIGHT UP, INDICATING THAT THE CRUISE CONTROL IS READY FOR OPERATION.

1.

SET OPERATION

WHEN THE CRUISE CONTROL MAIN SW IS TURNED ON AND THE SET SW IS PUSHED WITH THE VEHICLE SPEED WITHIN THE SET
LIMIT (APPROX. 40 KM/H, 25 MPH TO 200 KM/H, 124 MPH). A SIGNAL IS INPUT TO TERMINAL 10 OF THE CRUISE CONTROL ECU
AND THE VEHICLE SPEED AT THE TIME THE SET SW IS RELEASED IS MEMORIZED IN THE ECU AS THE SET SPEED.

2.

SET SPEED CONTROL

DURING CRUISE CONTROL DRIVING, THE ECU COMPARES THE SET SPEED MEMORIZED IN THE ECU WITH THE ACTUAL VEHICLE
SPEED INPUT INTO TERMINAL 12 OF THE CRUISE CONTROL ECU FROM THE SPEEDOMETER, AND CONTROLS THE CRUISE
CONTROL ACTUATOR TO MAINTAIN THE SET SPEED.
WHEN THE ACTUAL SPEED IS LOWER THAN THE SET SPEED, THE ECU CAUSES THE CURRENT TO THE CRUISE CONTROL
ACTUATOR TO FLOW FROM TERMINAL 15 OF THE CRUISE CONTROL ECU 

→

 TERMINAL 1 OF THE CRUISE CONTROL ACTUATOR

TERMINAL 2 

→

 TERMINAL 7 OF THE CRUISE CONTROL ECU. AS A RESULT, THE MOTOR IN THE CRUISE CONTROL ACTUATOR IS

ROTATED TO OPEN THE THROTTLE VALVE AND THE THROTTLE CABLE IS PULLED TO INCREASE THE VEHICLE SPEED. WHEN
THE ACTUAL DRIVING SPEED IS HIGHER THAN THE SET SPEED, THE CURRENT TO THE CRUISE CONTROL ACTUATOR FLOWS
FROM TERMINAL 7 OF THE ECU 

→

 TERMINAL 2 OF THE CRUISE CONTROL ACTUATOR 

→

 TERMINAL 1 

→

 TERMINAL 15 OF THE

CRUISE CONTROL ECU.
THIS CAUSES THE MOTOR IN THE CRUISE CONTROL ACTUATOR TO ROTATE TO CLOSE THE THROTTLE VALVE AND RETURN THE
THROTTLE CABLE TO DECREASE THE VEHICLE SPEED.

3.

COAST CONTROL

DURING THE CRUISE CONTROL DRIVING, WHILE THE COAST SW IS ON, THE CRUISE CONTROL ACTUATOR RETURNS THE
THROTTLE CABLE TO CLOSE THE THROTTLE VALVE AND DECREASE THE DRIVING SPEED. THE VEHICLE SPEED WHEN THE
COAST SWITCH IS TURNED OFF IS MEMORIZED AND THE VEHICLE CONTINUES AT THE NEW SET SPEED.

4.

ACCEL CONTROL

DURING CRUISE CONTROL DRIVING, WHILE THE ACCEL SW IS TURNED ON, THE CRUISE CONTROL ACTUATOR PULLS THE
THROTTLE CABLE TO OPEN THE THROTTLE VALVE AND INCREASE THE DRIVING SPEED.
THE VEHICLE SPEED WHEN THE ACCEL SW IS TURNED OFF IS MEMORIZED AND THE VEHICLE CONTINUES AT THE NEW SET
SPEED.

5.

RESUME CONTROL

UNLESS THE VEHICLE SPEED FALLS BELOW THE MINIMUM SPEED LIMIT (APPROX. 40 KM/H, 25 MPH) AFTER CANCELING THE SET
SPEED BY THE CANCEL SW, PUSHING THE RESUME SW WILL CAUSE THE VEHICLE TO RESUME THE SPEED SET BEFORE
CANCELLATION.

6.

MANUAL CANCEL MECHANISM

IF ANY OF THE FOLLOWING OPERATIONS OCCURS DURING CRUISE CONTROL OPERATION, THE MAGNETIC CLUTCH OF THE
ACTUATOR TURNS OFF AND THE MOTOR ROTATES TO CLOSE THE THROTTLE VALVE AND THE CRUISE CONTROL IS RELEASED.

∗

PLACING THE SHIFT LEVER EXCEPT “D” POSITION (PARK/NEUTRAL POSITION SW EXCEPT “D” POSITION). “SIGNAL IS NOT
INPUT TO TERMINAL 3 OF THE ECU”

∗

DEPRESSING THE BRAKE PEDAL (STOP LIGHT SW ON). “SIGNAL INPUT TO TERMINAL 2 OF THE ECU”

∗

PULL THE CANCEL SWITCH (CANCEL SW ON). “SIGNAL INPUT TO TERMINAL 10 OF THE ECU”

∗

PUSHING THE MAIN SWITCH (MAIN SW OFF). “SIGNAL INPUT TO TERMINAL 11 OF THE ECU”

SYSTEM OUTLINE

173

7. AUTO CANCEL FUNCTION

A)

IF ANY OF THE FOLLOWING OPERATING CONDITIONS OCCURS DURING CRUISE CONTROL OPERATION, THE SET SPEED IS
ERASED, THE CURRENT FLOW TO THE MAGNETIC CLUTCH IS STOPPED AND THE CRUISE CONTROL IS RELEASED. (MAIN SW
TURNS OFF).

WHEN THIS OCCURS, THE IGNITION SW MUST BE TURNED OFF ONCE BEFORE THE MAIN SW WILL TURN ON.

∗

WHEN CURRENT CONTINUED TO FLOW TO THE MOTOR INSIDE THE ACTUATOR IN THE THROTTLE VALVE “OPEN” DIRECTION.

∗

THE MOTOR DOES NOT OPERATE DESPITE THE MOTOR DRIVE SIGNAL BEING OUTPUT.

B)

IF ANY OF THE FOLLOWING OPERATING CONDITIONS OCCURS DURING CRUISE CONTROL OPERATION, THE SET SPEED IS
ERASED, THE CURRENT FLOW TO THE MAGNETIC CLUTCH IS STOPPED AND THE CRUISE CONTROL IS RELEASED. (MAIN SW
TURN OFF).

WHEN THIS OCCURS, THE CANCEL STATE IS CLEARED AS THE MAIN SW WILL TURN ON AGAIN.

∗

OVER CURRENT TO TRANSISTOR DRIVING THE MOTOR AND/OR THE MAGNETIC CLUTCH.

∗

OPEN CIRCUIT IN THE MAGNETIC CLUTCH.

∗

MOMENTARY INTERRUPTION OF VEHICLE SPEED SIGNAL

∗

SHORT CIRCUIT IN THE CRUISE CONTROL SW.

∗

WHEN THE VEHICLE SPEED FALLS MORE THAN 16 KM/H (10 MPH) BELOW THE SET SPEED, E.G. ON AN UPWARD SLOPE.

C)

IF ANY OF THE FOLLOWING CONDITIONS OCCURS DURING CRUISE CONTROL OPERATION, THE SET SPEED IS ERASED AND
THE CRUISE CONTROL IS RELEASED. (THE POWER TO THE MAGNETIC CLUTCH IS CUT OFF UNTIL THE SET SW IS “ON”
AGAIN.)

∗

WHEN THE VEHICLE SPEED FALLS BELOW THE MINIMUM SPEED LIMIT, APPROX. 40 KM/H (25 MPH)

∗

WHEN POWER TO THE CRUISE CONTROL SYSTEM IS MOMENTARILY CUT OFF.

D) I

F ANY OF THE FOLLOWING CONDITIONS OCCURS DURING CRUISE CONTROL OPERATION, THE CRUISE CONTROL IS

RELEASED.

∗

OPEN THE CIRCUIT FOR TERMINAL 2 OF THE STOP LIGHT SW.

8. AUTOMATIC TRANSMISSION CONTROL FUNCTION

∗

IN OVERDRIVE, IF THE VEHICLE SPEED BECOMES LOWER THAN THE OVERDRIVE CUT SPEED (SET SPEED MINUS APPROX. 4 
KM/H, 2.5 MPH) DURING CRUISE CONTROL OPERATION, SUCH AS DRIVING UP A HILL, THE OVERDRIVE IS RELEASED AND THE
POWER INCREASED TO PREVENT A REDUCTION IN VEHICLE SPEED.

∗

AFTER RELEASING THE OVERDRIVE, VEHICLE SPEED BECOMES HIGHER THAN THE OVERDRIVE RETURN SPEED (SET SPEED
MINUS APROX, 2 KM/H, 1.2 MPH) AND THE ECU JUDGES BY THE SIGNALS FROM THE ACTUATOR’S POTENTIOMETER THAT THE
UPWARD SLOPE HAS FINISHED, THE OVERDRIVE IS RESUMED AFTER APPROXIMATELY 2 SECONDS.

∗

DURING CRUISE CONTROL DRIVING, THE CRUISE CONTROL OPERATION SIGNAL IS OUTPUT FROM THE CRUISE CONTROL
ECU TO THE ENGINE CONTROL MODULE. UPON RECEIVING THIS SIGNAL, THE ENGINE CONTROL MODULE CHANGES THE
SHIFT PATTERN TO NORMAL.

TO MAINTAIN SMOOTH CRUISE CONTROL OPERATION (ON A DOWNWARD SLOPE ETC.), THE LOCK–UP RELEASE OF THE 
TRANSMISSION WHEN THE IDLING POINT OF THE THROTTLE POSITION IS “ON” IS FORBIDDEN.

C 3 CRUISE CONTROL ACTUATOR

3–4 : APPROX. 38 

Ω

C12 CRUISE CONTROL SW [COMB. SW]

5–3 : CONTINUITY WITH THE MAIN SW ON
4–3 : APPROX. 418 

Ω

 WITH THE CANCEL SW ON

APPROX. 68 

Ω

 WITH THE RES/ACCEL SW ON

APPROX. 198 

Ω

 WITH THE SET/COAST SW ON

C14 CRUISE CONTROL ECU

9–GROUND :

APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION

1–GROUND :

ALWAYS APPROX 12 VOLTS

12–GROUND :

4 PLUSES WITH 1 ROTATION OF THE ROTOR SHAFT

10–GROUND :

APPROX. 418 

Ω

 WITH THE CANCEL SW ON IN THE CONTROL SW

APPROX. 198 

Ω

 WITH THE SET/COAST SW ON IN THE CONTROL SW

APPROX. 68 

Ω

 WITH THE RES/ACCEL SW ON IN THE CONTROL SW

16–GROUND :

ALWAYS CONTINUITY

SYSTEM OUTLINE

SERVICE HINTS