Lexus ES300 (1997 year). Manual — part 343

DI0CB–02

Transaxle Control
System Check Sheet

Inspector’s
Name

:

Customer’s Name

Registration No.

Registration Year

Frame No.

Date Vehicle
Brought In

Odometer Reading

km
mile

/ /

/ /

Date Problem
Occurred
How Often Does
Problem Occur?

/ /

Continuous

Intermittent ( times a day)

Symptoms

Vehicle does not move (

Any position

Particular position )

No up–shift (

1st

→

2nd

2nd

→

3rd

3rd

→

O/D )

No down–shift (

O/D

→

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

Check Item

Malfunction
Indicator Lamp

DTC Check

1st Time

2nd Time

Normal code

Malfunction code (Code )

Normal

Remains ON

Normal code

Malfunction code (Code )

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

DI–149

301

1997 LEXUS ES300 (RM511U)

CUSTOMER PROBLEM ANALYSIS CHECK

DI0CF–01

FI0534

S05335

LEXUS hand–held tester

DLC3

DI–150

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

302

1997 LEXUS ES300 (RM511U)

PRE–CHECK

1.

DIAGNOSIS SYSTEM

(a)

DESCRIPTION
When troubleshooting OBD II vehicles, the only differ-
ence from the usual troubleshooting procedure is that you
connect to the vehicle an OBD II scan tool complying with
SAE J1987 or LEXUS hand–held tester, and read off vari-
ous data output from the vehicle’s ECM.
OBD II regulations require that the vehicle’s on–board
computer lights up the Malfunction Indicator Lamp (MIL)
on the instrument panel when the computer detects a
malfunction in the computer itself or in drive system com-
ponents which affect vehicle emissions. In addition to the
MIL lighting up when a malfunction is detected, the appli-
cable DTCs prescribed by SAE J2012 are recorded in the
ECM memory (See page

DI–14

).

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

To check the DTCs, connect an OBD II scan tool or
LEXUS hand–held tester to DLC3 on the vehicle. The
OBD II scan tool or LEXUS hand–held tester also enables
you to erase the DTCs and check freeze frame data and
various forms of engine data (For instruction book).
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 the manufacturer within the prescribed limits
(See DTC chart on page

DI–161

).

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

DI–150

)

N09214

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

DI–151

303

1997 LEXUS ES300 (RM511U)

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

(b)

DLC3 INSPECTION
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 OBD II scan tool or LEX-
US hand–held tester to DLC3, turned the ignition switch ON
and operated the scan tool, there is a problem on the vehicle
side or tool side.

(1)

If communication is normal when the tool is con-
nected to another vehicle, inspect DLC3 on the orig-
inal vehicle.

(2)

If communication is still not possible when the tool
is connected connected to another vehicle, the
problem is probably in the tool itself, so consult the
Service Department listed in the tool’s instruction
manual.

FI0534

S05335

LEXUS hand–held tester

DLC3

DI–152

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

304

1997 LEXUS ES300 (RM511U)

2.

INSPECT DIAGNOSIS (NORMAL MODE)

(a)

MIL CHECK
(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

BE–58

).

(2)

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

(b)

DTC CHECK

NOTICE:NOTICE(LEXUS hand–held tester only): When the
diagnostic system is switched from normal mode to check
mode, it erases all DTCs and freeze frame data recorded in
normal mode. So before switching modes, always check
the DTCs and freeze frame data, and note them down.

(1)

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

(2)

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

(3)

Turn the ignition switch ON and turn the OBD II scan
tool or LEXUS hand–held tester switch ON.

(4)

Use the OBD II scan tool or LEXUS hand–held tes-
ter 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

DI–161

to confirm the details of the DTCs.

NOTICE:
When simulating symptoms with an OBD II scan tool (ex-
cluding LEXUS hand–held tester) to check the DTCs, use
normal mode. For codes on the DTCs chart subject to ”2
trip detection logic”, turn the ignition switch off after the
symptoms have been simulated the 1st time. Them repeat
the simulation process again. When the program has DTCs
are recorded in the ECM.