Lexus ES300 (1997 year). Manual — part 429

N19825

4

3

(+)

(–)

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

DI–493

645

1997 LEXUS ES300 (RM511U)

DTC

14

Actuator Mechanical Malfunction

CIRCUIT DESCRIPTION

The circuit detects the rotation position of the actuator control plate and sends a signal to the ECU.

DTC No.

Detection Item

Trouble Area

14

Cruise control actuator mechanical malfunction.

Actuator lock: (motor, arm)

Actuator motor

Cruise control ECU

WIRING DIAGRAM

See page

DI–488

.

INSPECTION PROCEDURE

1

Check cruise control actuator arm locking operation

PREPARATION:
(a)

Turn ignition switch OFF.

(b)

Disconnect the actuator connector.

CHECK:
Connect the positive (+) lead from the battery to the terminal 3
of actuator and the negative (–) lead to terminal 4.
NOTICE:
Do not connect the high tension cables to the wrong bat-
tery terminal. You will damage the cruise control actuator.
(a)

Move the control plate by hand.

OK:

Control plate doesn’t move.

NG

Replace cruise control actuator.

OK

DI0EQ–01

N20641
N20642

I00738

DI–494

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

646

1997 LEXUS ES300 (RM511U)

2

Check cruise control actuator operation.

PREPARATION:
(a)

Turn ignition switch OFF.

(b)

Disconnect the actuator connector.

CHECK:
Connect the positive (+) lead from the battery to terminals 1 and
3 of actuator, connect the negative (–) lead to terminals 2 and
4 of actuator.
OK:

Control arm moves to full open side

CHECK:
Connect the positive (+) lead from the battery to terminals 2 and
4 of actuator, connect the negative (–) lead to terminals 1 and
3 of actuator.
OK:

Control arm moves to full close side

NG

Replace cruise control actuator.

OK

3

Check harness and connector between cruise control ECU and cruise control ac-
tuator (See page

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace cruise control ECU
(See page

IN–27

).

I00292

Vehicle Speed Sensor

ECU

Combination Meter

Cruise Control ECU

4 pulse/

1 rotation

of rotor shaft

4 pulse/

1 rotation

of rotor shaft

N21218

Cruise Control ECU

12

V–W

V–W

C

C

J17

Junction
Connector

3

V–W

Combination Meter

Speedo
–meter

P

L

2

7

3

2

1

to GAUGE Fuse

Speed
Sensor

C9

C9

C10

C14

10

9

4

SPD

IJ1

IJ1

IJ1

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

DI–495

647

1997 LEXUS ES300 (RM511U)

DTC

21

Open in Vehicle Speed Sensor Circuit

CIRCUIT DESCRIPTION

The vehicle speed sensor circuit is sent to cruise control ECU as vehicle speed signal.
The rotor shaft is driven by the gear of the transmission.
For each rotation of the shaft, the vehicle speed sensor sends a 4 pulse signal through the combination me-
ter to the cruise control ECU (See the following).
This signal is converted inside the combination meter and sent as a 4–pulse signal to the cruise control ECU.
The ECU calculates the vehicle speed from this pulse frequency.

DTC No.

Detection Item

Trouble Area

21

Speed signal is not input to the cruise control ECU while

cruise control is set.

Combination meter

Harness or connector between cruise control ECU and com-

bination meter, combination meter and vehicle speed sensor

Vehicle speed sensor

Cruise control ECU

WIRING DIAGRAM

DI0ER–01

Input Signal

Indicator Light
Blinking Pattern

Drive at about
40 km/h (25 mph)
or below

Drive at about
40 km/h (25 mph)
or higher

Light ON

OFF

Light

ON

OFF

DI–496

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

648

1997 LEXUS ES300 (RM511U)

INSPECTION PROCEDURE

1

Input signal check.

CHECK:
(a)

See input signal check on page

DI–478

.

(b)

Check indicator light operation when driving with vehicle
speed above 40 km/h (25 mph), and with vehicle speed
below 40 km/h (25 mph).

OK:

Vehicle speed above 40 km/h (25 mph):
Indicator light blinks
Vehicle speed below 40 km/h (25 mph):
Indicator light stays on

OK

Check and replace cruise control ECU
(See page

IN–27

).

NG

2

Check speedometer circuit (See Combination meter troubleshooting on page

BE–2

).

NG

Repair or replace harness, connector or com-
bination meter assembly.

OK

3

Check harness and connector between cruise control ECU and combination me-
ter, combination meter and vehicle speed sensor (See page

DI–493

).

NG

Repair or replace harness or connector.

OK