Lexus RX300 (MCU15). Manual - part 192

CIRCUIT INSPECTION

DI–572

. . . . . . . . . . . . . . . . . . . . . 

DRIVER DOOR CONTROL SYSTEM

DI–598

. . . . . . . 

HOW TO PROCEED WITH 

TROUBLESHOOTING

DI–598

. . . . . . . . . . . . . . . . . . . . 

CUSTOMER PROBLEM ANALYSIS CHECK

DI–599

. . . 

PARTS LOCATION

DI–600

. . . . . . . . . . . . . . . . . . . . . . . . . 

TERMINALS OF ECU

DI–601

. . . . . . . . . . . . . . . . . . . . . . 

PROBLEM SYMPTOMS TABLE

DI–602

. . . . . . . . . . . . . 

CIRCUIT INSPECTION

DI–603

. . . . . . . . . . . . . . . . . . . . . 

PASSENGER DOOR CONTROL 

SYSTEM

DI–620

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

HOW TO PROCEED WITH 

TROUBLESHOOTING

DI–620

. . . . . . . . . . . . . . . . . . . . 

CUSTOMER PROBLEM ANALYSIS CHECK

DI–621

. . . 

PARTS LOCATION

DI–622

. . . . . . . . . . . . . . . . . . . . . . . . . 

TERMINALS OF ECU

DI–623

. . . . . . . . . . . . . . . . . . . . . . 

PROBLEM SYMPTOMS TABLE

DI–624

. . . . . . . . . . . . . 

CIRCUIT INSPECTION

DI–625

. . . . . . . . . . . . . . . . . . . . . 

REAR LEFT DOOR CONTROL SYSTEM

DI–642

. . . 

HOW TO PROCEED WITH 

TROUBLESHOOTING

DI–642

. . . . . . . . . . . . . . . . . . . . 

CUSTOMER PROBLEM ANALYSIS CHECK

DI–643

. . . 

PARTS LOCATION

DI–644

. . . . . . . . . . . . . . . . . . . . . . . . . 

TERMINALS OF ECU

DI–645

. . . . . . . . . . . . . . . . . . . . . . 

PROBLEM SYMPTOMS TABLE

DI–647

. . . . . . . . . . . . . 

CIRCUIT INSPECTION

DI–648

. . . . . . . . . . . . . . . . . . . . . 

REAR RIGHT DOOR CONTROL 

SYSTEM

DI–659

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

HOW TO PROCEED WITH 

TROUBLESHOOTING

DI–659

. . . . . . . . . . . . . . . . . . . . 

CUSTOMER PROBLEM ANALYSIS CHECK

DI–660

. . . 

PARTS LOCATION

DI–661

. . . . . . . . . . . . . . . . . . . . . . . . . 

TERMINALS OF ECU

DI–662

. . . . . . . . . . . . . . . . . . . . . . 

PROBLEM SYMPTOMS TABLE

DI–664

. . . . . . . . . . . . . 

CIRCUIT INSPECTION

DI–665

. . . . . . . . . . . . . . . . . . . . . 

MULTIPLEX COMMUNICATION SYSTEM

DI–676

. . 

HOW TO PROCEED WITH 

TROUBLESHOOTING

DI–676

. . . . . . . . . . . . . . . . . . . . 

CUSTOMER PROBLEM ANALYSIS CHECK

DI–677

. . . 

PRE–CHECK

DI–678

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DIAGNOSTIC TROUBLE CODE CHART

DI–683

. . . . . . 

PARTS LOCATION

DI–685

. . . . . . . . . . . . . . . . . . . . . . . . . 

TERMINALS OF ECU

DI–686

. . . . . . . . . . . . . . . . . . . . . . 

CIRCUIT INSPECTION

DI–688

. . . . . . . . . . . . . . . . . . . . . 

LEXUS NAVIGATION SYSTEM

DI–726

. . . . . . . . . . . . 

HOW TO PROCEED WITH 

TROUBLESHOOTING

DI–726

. . . . . . . . . . . . . . . . . . . . 

CUSTOMER PROBLEM ANALYSIS CHECK

DI–727

. . . 

PRE–CHECK

DI–728

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DIAGNOSTIC TROUBLE CODE CHART

DI–745

. . . . . . 

PARTS LOCATION

DI–751

. . . . . . . . . . . . . . . . . . . . . . . . . 

TERMINALS OF ECU

DI–752

. . . . . . . . . . . . . . . . . . . . . . 

PROBLEM SYMPTOMS TABLE

DI–756

. . . . . . . . . . . . . 

CIRCUIT INSPECTION

DI–757

. . . . . . . . . . . . . . . . . . . . . 

AIR CONDITIONING SYSTEM

DI–803

. . . . . . . . . . . . 

HOW TO PROCEED WITH 

TROUBLESHOOTING

DI–803

. . . . . . . . . . . . . . . . . . . . 

CUSTOMER PROBLEM ANALYSIS CHECK

DI–804

. . . 

PRE–CHECK

DI–805

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DIAGNOSTIC TROUBLE CODE CHART

DI–809

. . . . . . 

TERMINALS OF ECU

DI–811

. . . . . . . . . . . . . . . . . . . . . . 

PROBLEM SYMPTOMS TABLE

DI–812

. . . . . . . . . . . . . 

CIRCUIT INSPECTION

DI–814

. . . . . . . . . . . . . . . . . . . . . 

DI4DW–13

Vehicle Brought to Workshop

Customer Problem Analysis P. DI–2

Problem Symptom Confirmation

If the engine does not start perform steps 10 and 12 first

Connect the hand–held tester to DLC3 P. DI–3

If the display indicates a communication fault in the tool, inspect DLC3 P. DI–3

Check DTC and Freezed Frame Data (Precheck)

Record or Print DTC and Freezed Frame Data P. DI–3

Clear DTC and Freezed Frame Data P. DI–3

Visual Inspection

Setting the Check (Test) Mode Diagnosis P. DI–3

Symptom Simulation P IN–22.

Basic Inspection P. DI–3

DTC Chart P. DI–14

Problem Symptom Table P. DI–21

Circuit Inspection P. DI–22 – DI–123

Adjustment, Repair

DTC Check P. DI–3

Titles inside

are titles of pages in

in the bottom portion. See the indicated
pages for detailed explanations.

this manual with the page number indicated

Malfunction
occurs.

Malfunction does not occur.

Parts Inspection

Check for Intermittent Problems P. DI–3

Identification of Problem

Confirmation Test

End

1

2

3

4

5

6

7

10

8

9

11

12

13

15

14

16

Normal

Malfunction code.

17

–

DIAGNOSTICS

ENGINE

DI–1

LEXUS RX300   (RM785E)

ENGINE

HOW TO PROCEED WITH TROUBLESHOOTING

When using hand–held tester, troubleshooting in accordance with the procedure on the following page.

DI4DX–02

ENGINE CONTROL SYSTEM Check Sheet

Customer’s Name

Driver’s Name

Data Vehicle

Brought in

License No.

Model and Model
Year

Frame No.

Engine Model

Odometer Reading

km
miles

Problem Symptoms

Engine does
not Start

Difficult to
Start

Poor Idling

Poor
Drivability

Engine Stall

Others

Engine does not crank

No initial combustion

No complete combustion

Engine cranks slowly

Other

Incorrect first idle

Idling rpm is abnormal

High (                    rpm)

Low (                    rpm)

Rough idling

Other

Hesitation

Back fire

Muffler explosion (after–fire)

Surging

Knocking

Other

Soon after starting

After accelerator pedal depressed

After accelerator pedal released

During A/C operation

Shifting from N to D

Other

Datas Problem
Occurred

Problem Frequency

Condition When

Problem Occurs

Weather

Engine Operation

Engine Temp.

Place

Outdoor
Temperature

Constant

Sometimes (          times per          day/month)

Once only

Other

Fine

Cloudy

Rainy

Snowy

Various/Other

Hot

Warm

Cool

Cold (approx.           

°F/          °C)

Highway

Suburbs

Inner City

Uphill

Downhill

Rough road

Other

Cold

Warming up

After Warming up

Any temp.

Other

Starting

Just after starting (          min.)

Idling

Racing

Driving

Constant speed

Acceleration

Deceleration

A/C switch ON/OFF

Other

Condition of check engine warning light
(CHK ENG)

Remains on

Sometimes light up

Does not light up

Normal

Malfunction code(s) (code                    )
Freezed frame data (                           )

Normal

Malfunction code(s) (code                    )
Freezed frame data (                           )

Normal mode
(Precheck)

Check Mode

DTC Inspection

Inspector’s
Name

DI–2

–

DIAGNOSTICS

ENGINE

LEXUS RX300   (RM785E)

CUSTOMER PROBLEM ANALYSIS CHECK

FI2547

DI7O5–02

D09456

Hand–Held Tester

DLC3

–

DIAGNOSTICS

ENGINE

DI–3

LEXUS RX300   (RM785E)

PRE–CHECK

1.

DIAGNOSIS SYSTEM

(a)

Description

S

When troubleshooting Euro–OBD vehicles, the
only difference from the usual troubleshooting pro-
cedure is that you connect to the vehicle the OBD
scan tool complying with ISO 15031–4 or hand–
held tester, and read off various data output from
the vehicle’s engine ECU.

S

Euro–OBD regulations require that the vehicle’s
on–board computer lights up the check engine
warning light on the instrument panel when the
computer detects a malfunction in the emission
control system / components or in the power train
control components which affect vehicle emissions,
or a malfunction in the computer. In addition to the
check engine warning light lighting up when a mal-
function is detected, the applicable Diagnostic
Trouble Codes (DTC) prescribed by ISO 15031–4
are recorded in the engine ECU memory (See page
DI–14). If the malfunction does not reoccur in 3 con-
secutive trips, the check engine warning light goes
off automatically but the DTCs remain recorded in
the engine ECU memory.

S

When DTC P3190, P3191 are detected and the re-
main of the fuel is little, the computer judges the
cause as a fuel shortage, and after the next trip,
when the supply of fuel is confirmed, it turns off MIL,
but the memory of DTC still remains.

S

To check the DTCs, connect the OBD scan tool or
hand–held tester to Data Link Connector 3 (DLC3)
on the vehicle. The OBD scan tool or hand–held
tester also enables you to erase the DTCs and
check freezed frame data and various forms of en-
gine data. (For operating instructions, see the OBD
scan tool’s instruction book.)
DTCs include ISO controlled codes and manufac-
turer controlled codes. ISO controlled codes must
be set as prescribed by the ISO, while manufacturer
controlled codes can be set freely by the manufac-
turer within the prescribed limits. (See DTC chart on
page DI–14)