Lexus ES300 (2002 year). Manual - part 334

0527I-03

/                  /

How Often Does
Problem Occur?

/                  /

Automatic Transmission
System Check Sheet

Inspector’s
Name              :

Customer’s Name

Date Vehicle
Brought In

/                   /

Registration No.

Registration Year

Frame No.

Odometer Reading

km
mile

Date Problem
Occurred

Continuous

Intermittent (           times a day)

Symptoms

No up-shift     (      1st 

→

 2nd         2nd 

→

 3rd         3rd 

→

 4th         4th 

→

 5th)

Vehicle does not move (      Any position       particular position)

No down-shift     (      5th 

→

 4th         4th 

→

 3rd         3rd 

→

 2nd         2nd 

→

 1st)

Lock-up malfunction

Shift point too high or too low

Harsh engagement (      N 

→

 D        Lock-up        Any drive position)

Slip or shudder

No kick-down

Others

DTC Check

1st Time

2nd Time

Check Item

Normal code

Malfunction code (DTC                                  )

Normal code

Malfunction code (DTC                                  )

Malfunction
Indicator Lamp

Normal

Remains ON

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2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

CUSTOMER PROBLEM ANALYSIS CHECK

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2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

PRE-CHECK

1.

DIAGNOSIS SYSTEM

(a)

Description
(1)

When troubleshooting OBD II vehicles, the only dif-
ference from the usual troubleshooting procedure
is that you need to connect an OBD II scan tool com-
plying with SAE J1987 or a hand-held tester to the
vehicle, and read off various data output from the
vehicle’s ECM.

(2)

OBD II regulations require that the vehicle’s  on-
board computer lights up the Malfunction Indicator
Lamp (MIL) on the instrument panel when the com-
puter detects a malfunction in the computer itself or
in the drive system components which affect the ve-
hicle emissions.  In addition to the MIL lighting up
when a malfunction is detected, the applicable
DTCs prescribed by SAE J2012 are recorded in the
ECM memory (See page 

05-5

).

If the malfunction only occurs in 3 consecutive trips, the MIL
goes off but the DTCs remain in the ECM memory.

(3)

To check the DTCs, connect OBD II scan tool or
hand-held  tester to the DLC3 of the vehicle. The
OBD II scan tool or hand-held tester also enables
you to erase the DTCs and check freeze frame data
and various forms of engine data (For instruction
book).

(4)

The DTCs include SAE controlled codes and
Manufacturer controlled codes. SAE controlled
codes must be set as prescribed by the SAE, while
Manufacturer controlled codes can be set freely by
a manufacturer within the prescribed limits (See the
DTC chart on page 

05-400

).

(5)

The diagnosis system operates in the normal mode
during the normal vehicle use, and also has a check
mode for technicians to simulate malfunction symp-
toms and perform troubleshooting. Most DTCs use
2 trip detection logic(*) to prevent erroneous detec-
tion. By switching the ECM to the check mode when
troubleshooting,  the technician can cause the MIL
to light up for a malfunction that is only detected
once or momentarily.  (hand-held  tester).

(6)

*2 trip detection logic:
When a malfunction is first detected, the malfunc-
tion is temporarily stored in the ECM memory. If the
same malfunction is detected again during the se-
cond test drive, this second detection causes the
MIL to light up .

3

2

1

4 5 6 7 8

9 10111213141516

DLC3

A04550

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(b)

Inspect the DLC3.
The vehicle’s ECM uses ISO 9141-2 for communication.
The terminal arrangement of DLC3 complies with SAE
J1962 and matches the ISO 9141-2 format.

Tester connection

Condition

Specified condition

7 (Bus 



 Line) - 5 (Signal ground)

During communication

Pulse generation

4 (Chassis Ground) - Body

Always

1 

Ω

 or less

5 (Signal Ground) - Body

Always

1 

Ω

 or less

16 (B+) - Body

Always

9 - 14 V

HINT:
If your display shows UNABLE TO CONNECT TO VEHICLE
when you have connected the cable of the OBD II scan tool or
hand-held  tester to the DLC3, turned the ignition switch ON
and operated the scan tool, there is a problem on the vehicle
side or tool side.

If the communication is normal when the tool is connected
to another vehicle, inspect the DLC3 on the original ve-
hicle.

If the communication is still impossible when the tool is
connected to another vehicle, the problem is probably in
the tool itself, so consult the Service Department listed in
the tool’s instruction manual.

2.

Normal Mode: 
INSPECT DIAGNOSIS

(a)

Check the MIL.
(1)

The MIL comes on when the ignition switch is turned
ON and the engine is not running.

HINT:
If the MIL does not light up, troubleshoot the combination meter
(See page 

71-1

).

(2)

When the engine is started, the MIL should go off.
If the lamp remains on, it means that the diagnosis
system has detected a malfunction or abnormality
in the system.

(b)

Check the DTC.

NOTICE:
Hand-held tester only: 
When the diagnostic system is switched from the normal
mode to the check mode, all the DTCs and freeze frame
data recorded in the normal mode will be eraced. So before
switching modes, always check the DTCs and freeze frame
data, and note them down.

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DIAGNOSTICS

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2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

(1)

Prepare an OBD II scan tool (complying with SAE
J1978) or hand-held tester.

(2)

Connect the OBD II scan tool or hand-held tester
to the DLC3 at the lower of the instrument panel.

(3)

Turn the ignition switch ON and press the OBD II
scan tool or hand-held tester switch ON.

(4)

Use the OBD II scan tool or hand-held tester to
check the DTCs and freeze frame data and note
them down (For operating instructions, see the
OBD II scan tool’s instruction book).

(5)

See page 

05-400

 to confirm the details of the 

DTCs.

NOTICE:
When simulating symptoms with an OBD II scan tool (ex-
cluding hand-held tester) to check the DTCs, use the nor-
mal mode. For codes on the DTCs chart subject to ”2 trip
detection logic”, turn the ignition switch OFF after the
symptom is simulated once. Then repeat the simulation
process again. When the problem has been simulated
twice, the MIL is indicated on the instrument panel and
DTCs are recorded in the ECM.
3.

Check Mode:
INSPECT DIAGNOSIS

HINT:
Hand-held tester only:
Compared to the normal mode, the check mode has more sen-
sitive ability to detect malfunctions. Furthermore, the same
diagnostic items which are detected in the normal mode can
also be detected in the check mode.
(a)

Check the DTC.
(1)

Check the initial conditions.

Battery positive voltage 11 V or more

Throttle valve fully closed

Transaxle in P position

A/C switched OFF

(2)

Turn the ignition switch OFF.

(3)

Prepare a hand-held tester.

(4)

Connect the hand-held tester to the DLC3 at the
lower of the instrument panel.

(5)

Turn the ignition switch ON and push the  hand-held
tester ON.