Lexus ES300 (2002 year). Service manual — part 381
![](/vehicle/tus/pedalineteha/owha/mouke.png)
A62012
Battery
FL MAIN
B-G
Engine Room R/B
1
1A
1B
ETCS
L-R
+BM
ECM
IL2
1
B-G
2
2
Engine Room J/B
1
6
E7
L-R
L-R
1H
4
1K
9
Engine Room J/B
05-130
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
283
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P1127
ETCS ACTUATOR POWER SOURCE
CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal +BM of the ECM even once when the ignition switch is OFF
for the electric throttle control system.
If this DTC is stored, the ECM shuts down the power for the throttle motor, and the throttle valve is fully closed
by the return spring.
DTC No.
DTC Detection Condition
Trouble Area
P1127
Open in ETCS power source circuit
Open in ETCS power source circuit
ECM
WIRING DIAGRAM
055CN-03
![](/vehicle/tus/pedalineteha/owha/qunothevecal.png)
A59660
ETCS(10A)
A53769
+BM
ME01
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-131
284
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using hand-held tester or OBD II scan tool. Because freeze frame records the en-
gine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether
the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich,
etc. at the time of the malfunction.
1
INSPECT ETCS FUSE
(a)
Check the countinuity of the ETCS fuse.
Standard: Continuity
NG
CHECK FOR SHORT IN ALL THE HARNESS TO
ETCS FUSE
OK
2
INSPECT ECM(+BM - ME01)
(a)
Measure the voltage between terminals +BM and ME01
of the ECM connectors.
Voltage: 9 - 14 V
NG
CHECK AND REPLACE ECM
OK
3
CHECK HARNESS AND CONNECTOR(BATTERY - ETCS FUSE, ETCS FUSE -
ECM)
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ECM
![](/vehicle/tus/pedalineteha/owha/uelldg.png)
A57007
05-132
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
285
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P1128
THROTTLE CONTROL MOTOR LOCK
MALFUNCTION
CIRCUIT DESCRIPTION
Throttle motor is operated by the ECM and it opens and closes the throttle valve. The opening angle of the
throttle valve is detected by the throttle position sensor which is mounted on the throttle body and it provides
feedback to the ECM to control the throttle motor in order the throttle valve opening angle properly in re-
sponse to driving condition. If this DTC is stored, the ECM shuts down the power for the throttle motor, and
the throttle valve is fully closed by the return spring.
DTC No.
DTC Detection Condition
Trouble Area
P1128
Lock throttle control motor during control throttle control motor
Throttle body assy (Throttle motor)
Throttle body assy (Throttle valve)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using hand-held tester or OBD II scan tool, as freeze frame data records the engine
conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the
vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc.
at the time of the malfunction.
1
INSPECT THROTTLE BODY ASSY(THROTTLE CONTROL MOTOR)
(a)
Disconnect the throttle control motor connector.
(b)
Using an ohmmeter, measure the motor resistance be-
tween terminals 1 (M-) and 2 (M+).
Motor resistance: 0.3 - 100
Ω
at 20
°
C (68
°
F)
NG
REPLACE THROTTLE BODY ASSY
OK
2
INSPECT THROTTLE BODY ASSY(THROTTLE VALVE)
Check whether or not a foreign body is caught between the throttle valve and housing.
NG
REMOVE FOREIGN BODY AND CLEAN
THROTTLE BODY
OK
REPLACE THROTTLE BODY ASSY (See page
055CA-03
![](/vehicle/tus/pedalineteha/owha/earu.png)
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-133
286
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P1129
ELECTRIC THROTTLE CONTROL SYSTEM
MALFUNCTION
CIRCUIT DESCRIPTION
Electric Throttle Control System (ETCS) is composed of the throttle motor to operate the throttle valve, the
throttle position sensor to detect the opening angle of the throttle valve, the accelerator pedal position sensor
to detect the accelerator pedal position, the ECM to control the ETCS and the one valve type throttle body.
The ECM controls the throttle motor to make the throttle valve opening angle properly in response driving
condition.
The throttle position sensor which is mounted on the throttle body detects the opening angle of the throttle
valve, and it provides feedback to the ECM to control the throttle motor.
If the ETCS has a malfunction, the ECM shuts down the power for the throttle motor, and the throttle valve
is fully closed by the return spring.
DTC No.
DTC Detection Condition
Trouble Area
P1129
Throttle opening angle continues to vary greatly from target
throttle opening angle
Electric throttle control system
ECM
WIRING DIAGRAM
Refer to DTC P1125 on page
.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using hand-held tester or OBD II scan tool. Because freeze frame records the en-
gine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether
the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich,
etc. at the time of the malfunction.
1
CHECK OTHER DTC OUTPUT(BESIDES DTC P1129)
(a)
Read the DTC using hand-held tester or OBD II scan tool.
YES
GO TO RELEVANT DTC CHART
NO
2
INSPECT THROTTLE BODY ASSY (See Page
NG
REPLACE THROTTLE BODY ASSY
OK
INSPECT ECM
056H9-01
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