Lexus ES300 (2002 year). Manual — part 357
A61997
VC VTA1 VTA2 E2
A54406
E10
A53763
E2
VC
05-48
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
201
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
5
CHECK HARNESS AND CONNECTOR(ECM - THROTTLE BODY)
(a)
Disconnect the throttle position sensor connector and
ECM E10 connector. Read throttle opening angle on the
hand-held tester.
Throttle opening percentage:
Accelerator pedal released: 0 %
Accelerator pedal depressed: 64 - 96 %
HINT:
If the throttle position is 100 % when releasing throttle pedal, E2
circuit is open.
If the throttle position is 0 % when depressing accelerator ped-
al, VC or VTA1 circuit is open.
If the throttle position is not 0 % when releasing accelerator
pedal or throttle position is not 100 % when depressing throttle
pedal, VTA2 circuit is open or short.
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ECM
OBD II scan tool (excluding Hand-held Tester):
1
INSPECT ECM(VC - E2)
(a)
Measure the voltage between terminals VC and E2 of the
ECM connector.
Voltage: 4.5 - 5.5 V
NG
CHECK AND REPLACE ECM
OK
A53763
VTA1
VTA2
E2
A54410
E2
VC
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-49
202
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
2
INSPECT ECM(VTA1 - E2, VTA2 - E2)
(a)
Measure the voltage between terminals VTA1 and E2,
and VTA2 and E2 of the ECM connector.
A
l
t
d l
Voltage
Accelerator pedal
VTA1 - E
VTA2 - E2
Released
0.4 - 1.0 V
2.0 - 2.9 V
Depressed
3.2 - 4.8 V
4.6 - 5.0 V
OK
CHECK AND REPLACE ECM
NG
3
INSPECT E.F.I. THROTTLE POSITION SENSOR
(a)
Disconnect the throttle position sensor connector.
(b)
Using an ohmmeter, measure the resistance between ter-
minals VC and E2.
Resistance: 1.2 - 3.2 k
Ω
at 20
°
C (68
°
F)
NG
REPLACE E.F.I. THROTTLE POSITION SENSOR
OK
A61997
VC VTA1 VTA2 E2
A54406
E10
05-50
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
203
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
4
CHECK HARNESS AND CONNECTOR(ECM - THROTTLE BODY)
(a)
Disconnect the throttle position sensor connector and
E10 connector. Read throttle opening angle on the OBD
ll scan tool.
Throttle opening percentage:
Accelerator pedal released: 0 %
Accelerator pedal depressed: 64 - 96 %
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ECM
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-51
204
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P0121
THROTTLE/PEDAL POSITION
SENSOR/SWITCH”A”CIRCUIT
RANGE/PERFFORMANCE PROBLEM
CIRCUIT DESCRIPTION
Refer to DTC P0120 on page
DTC No.
DTC Detecting Condition
Trouble Area
P0121
Condition (a) continues for 2.0 seconds: (IDL ON: 10 seconds)
(a) Difference between VTA1 and VTA2 is out of thresshold
(b) IDL is OFF
Throttle position sensor
ECM
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.
REPLACE E.F.I. THROTTLE POSITION SENSOR
051M0-07
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