Lexus ES300 (1997 year). Service manual — part 425

DI0EH–01

CRUISE CONTROL SYSTEM Check Sheet

Inspector’s name:

Customer’s Name

Date of Vehicle

Registration No.

Registration Year

Frame No.

Odometer Reading

/ /

km
Mile

Condition of
Problem Occurrence

Date of Problem

How Often does

Occurrence

Problem Occur?

Vehicle Speed when
Problem Occurred

/ /

Continuous Intermittent ( Times a day)

km
Mile

Brought in

Auto cancel

occurs

Driving condition

City driving

Freeway

Up hill

Down hill

After cancel occurred, did the driver activate cruise control
again?

Yes

No

Cancel does not

occur

With brake ON

Except D position shift

At 40 km/h (25 mph) or less

When control SW turns to CANCEL position

Cruise control

malfunction

Slip to acceleration side

Slip to deceleration side

Hunting occurs

O/D cut off does not occur

O/D does not return

Switch

malfunction

SET

ACCEL

COAST

RESUME

CANCEL

Remains ON

Does not light up

Blinking

Symptoms

DTC Check

1st Time

2nd Time

Normal Code

Malfunction Code (Code )

Normal Code

Malfunction Code (Code )

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

DI–477

629

1997 LEXUS ES300 (RM511U)

CUSTOMER PROBLEM ANALYSIS CHECK

DI0EI–01

N21862

CRUISE MAIN Indicator Light

BE4034

Indicator Light

1.5 sec.

0.5 sec.

ON

OFF

I00169

DLC2

TC

E1

DI–478

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

630

1997 LEXUS ES300 (RM511U)

PRE–CHECK

1.

DIAGNOSIS SYSTEM

(a)

INDICATOR CHECK
(1)

Turn the ignition switch to ON.

(2)

Check that the CRUISE MAIN indicator light comes
on when the cruise control main switch is turned on,
and that the indicator light goes off when the main
switch is turned OFF.

HINT:
If the indicator check result is not normal, proceed to trouble-
shooting (See page

BE–2

) for the combination meter section.

(b)

DTC CHECK

HINT:
If a malfunction occurs in the No. 1 vehicle speed sensors or ac-
tuator, etc. during cruise control driving, the ECU actuates
AUTO CANCEL of the cruise control and turns on and off the
CRUISE MAIN indicator light to inform the driver of a malfunc-
tion. At the same time, the malfunction is stopped in memory as
a diagnostic trouble code.

(c)

OUTPUT OF DTC USING DIAGNOSIS CHECK WIRE
(1)

Turn the ignition switch ON.

(2)

Using SST, connect terminals Tc and E

1

of DLC2.

SST

09843–18020

(3)

Read the DTC on the CRUISE MAIN indicator light.

BE4032

BE4033

I00021

Normal Code

0.25 sec.

0.25 sec.

ON

OFF

ON

OFF

4 sec.

1.5 sec.

0.5 sec.

2.5 sec.

0.5 sec.

1.5 sec.

Malfunction codes 11 and 21

Code 11

Code 21

N09348

LEXUS hand–held tester

LEXUS Break–out–box

S05334

N20674

Engine Room Junction Block No.2

ECU–B Fuse

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

DI–479

631

1997 LEXUS ES300 (RM511U)

HINT:
If the DTC is not output, inspect the diagnosis circuit
(See page

DI–523

).

As an example, the blinking patterns for codes; normal, 11 and
21 are shown in the illustration.

2.

ECU TERMINAL VALUES MEASUREMENT BY USING
LEXUS BREAK–OUT–BOX AND LEXUS HAND–HELD
TESTER

(a)

Hook up the break–out–box and LEXUS hand–held tes-
ter to the vehicle.

(b)

Read the ECU input/output values by following the
prompts on the tester screen.

(c)

Please refer to the LEXUS hand–held tester has a ”Snap-
shot” function. This records the measured data and is ef-
fective in the diagnosis of intermittent problems.

3.

USING LEXUS HAND–HELD TESTER

(a)

Hook up the LEXUS hand–held tester to the DLC2.

(b)

Monitor the ECU data by following the prompts on the tes-
ter screen.

HINT:LEXUS hand–held tester has a ”Snapshot” function
which records the monitored data.
Please refer to the LEXUS hand–held tester operator’s manual
for further details.

4.

DTC CLEARANCE

(a)

After completing repairs, the DTC retained in memory can
be cleared by removing the ECU–B fuse for 10 seconds
or more, with the ignition switch off.

(b)

Check that the normal code is displayed after connecting
the fuse.

N17520

N17520

N17520

DI–480

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

632

1997 LEXUS ES300 (RM511U)

5.

PROBLEM SYMPTOM CONFIRMATION
(ROAD TEST)

(a)

SET INSPECTION
(1)

Push the main switch ON.

(2)

Drive at a desired speed (40 km/h (25 mph) or high-
er).

(3)

Press the control switch to the SET/COAST.

(4)

After releasing the switch, check that the vehicle
cruises at the desired speed.

(b)

ACCEL INSPECTION
(1)

Push the main switch ON.

(2)

Drive at a desired speed (40 km/h (25 mph) or high-
er).

(3)

Check that the vehicle speed is increased while the
control switch turned to RES/ACC, and that the ve-
hicle cruises at the set speed when the switch is re-
leased.

(4)

Momentarily press the control switch upward in the
RES/ACC and then immediately release it. Check
that the vehicle speed increases by about 1.5 km/h
(Tap–up function).

(c)

COAST INSPECTION
(1)

Push the main switch ON.

(2)

Drive at a desired speed (40 km/h (25 mph) or high-
er).

(3)

Check that the vehicle speed is decreased while the
control switch is turned to SET/COAST, and the ve-
hicle cruise at the set speed when the switch is re-
leased.

(4)

Momentarily press the control switch is turned to
SET/COAST, and then immediately release it.
Check that the vehicle speed decreases by about
1.5 km/h (Tap–down function).