Lexus ES300 (2002 year). Manual — part 380
A54404
EPA2
EPA
E6
A54384
EPA
EPA2
05-126
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
279
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
CHECK HARNESS AND CONNECTOR(ECM - ACCELERATOR POSITION
SENSOR)
(a)
Disconnect the ECM E6 connector.
(b)
Check the continuity of the accelerator position sensor
and ECM.
Standard: Continuity
(c)
Check the continuity of the EPA, EPA2 of the accelerator
position sensor and the body ground.
Standard: No continuity
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE ACCELERATOR PEDAL ASSY
A54292
Throttle body assy
(Throttle Motor)
2
1
B
W
ECM
3
2
17
M+
M-
E8
(Shielded)
E8
E8
GE01
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-127
280
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P1125
THROTTLE CONTROL MOTOR CIRCUIT
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 to control the throttle
valve opening angle properly in response 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
Conditions (a) and (b) continue for 2.0 seconds:
(a) Throttle control motor output duty
80 %
(b) Throttle control motor current < 0.5 A
Open or short in throttle control motor circuit
P1125
Throttle control motor current
16 A
Throttle body assy (Throttle motor)
ECM
Condition (a) continues for 0.6 seconds:
(a) Throttle control motor current
high
ECM
WIRING DIAGRAM
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.
056HA-01
A03403
A03404
A58429
M+ Signal Waveform
5V/
Division
GND
1 m sec./Division
M- Signal Waveform
GND
5V/
Division
1 m sec./Division
A57007
05-128
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
281
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
1
INSPECT THROTTLE BODY ASSY(THROTTLE CONTROL MOTOR CIRCUIT)
(a)
Check the waveform between E8 ECM terminals M+ or
M- and E1 when the engine is idling.
HINT:
The waveform frequency changes depending on the throttle
opening.
OK
CHECK AND REPLACE ECM
NG
2
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
A54408
M+
M-
E8
A51984
A52933
M-
M+
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-129
282
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
CHECK HARNESS AND CONNECTOR(ECM - THROTTLE CONTROL MOTOR)
(a)
Disconnect the ECM E8 connector.
(b)
Check the continuity of the throttle control motor and
ECM.
Standard: Continuity
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ECM
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