Lexus RX300 (MCU15). Service 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)
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