Lexus ES300 (2002 year). Manual — part 379
A53765
VCPA
EPA
EPA2
VCP2
A53765
EPA2
VPA
EPA
VPA2
A54291
VCP1
VCP2
EP2
EP1
05-122
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
275
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
2
INSPECT ECM(VCPA - EPA, VCP2 - EPA2)
(a)
Measure the voltage between terminals VCPA and EPA,
VCP2 and EPE2 of the ECM connector.
Voltage: 4.5 - 5.5 V
NG
CHECK AND REPLACE ECM
OK
3
INSPECT ECM(VPA - EPA, VPA2 - EPA2)
(a)
Measure the voltage between terminals VPA and EPA,
and VPA2 and EPA2 of the ECM connector.
A
l
t
d l
Voltage
Accelerator pedal
VPA - EPA
VPA2 - EPA2
Released
0.5 - 1.1 V
0.9 - 2.3 V
Depressed
3.0 - 4.6 V
3.4 - 5.0 V
OK
CHECK AND REPLACE ECM
NG
4
INSPECT ACCELERATOR PEDAL ASSY(POSITION SENSOR)
(a)
Disconnect the accelerator pedal position sensor con-
nector.
(b)
Using an ohmmeter, measure the resistance between
each terminals.
Resistance: at 20
°
C (68
°
F)
Terminals
Resistance
VCP1 - EP1
VCP2 - EP2
2.25 - 4.75 k
Ω
NG
REPLACE ACCELERATOR PEDAL ASSY
OK
A53765
VCPA
EPA
EPA2
VCP2
A53765
EPA2
VPA
EPA
VPA2
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-123
276
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
5
CHECK AND REPLACE HARNESS AND CONNECTOR(ECM - ACCELERATOR
POSITION SENSOR)
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ECM
OBD II scan tool (excluding hand-held tester):
1
INSPECT ECM(VCPA - EPA, VCP2 - EPA2)
(a)
Measure the voltage between terminals VCPA and EPA,
VCP2 and EPA2 of the ECM connector.
Voltage: 4.5 - 5.5 V
NG
CHECK AND REPLACE ECM
OK
2
INSPECT ECM(VPA - EPA, VPA2 - EPA2)
(a)
Measure the voltage between terminals VPA and EPA,
and VPA2 and EPA2 of the ECM connector.
A
l
t
d l
Voltage
Accelerator pedal
VPA - EPA
VPA2 - EPA2
Released
0.5 - 1.1 V
0.9 - 2.3 V
Depressed
3.0 - 4.6 V
3.4 - 5.0 V
OK
CHECK AND REPLACE ECM
NG
A54291
VCP1
VCP2
EP2
EP1
05-124
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
277
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
INSPECT ACCELERATOR PEDAL ASSY(POSITION SENSOR)
(a)
Disconnect the accelerator pedal position sensor con-
nector.
(b)
Using an ohmmeter, measure the resistance between
each terminals.
Resistance: at 20
°
C (68
°
F)
Terminals
Resistance
VCP1 - EP1
VCP2 - EP2
2.25 - 4.75 k
Ω
NG
REPLACE ACCELERATOR PEDAL ASSY
OK
4
CHECK HARNESS AND CONNECTOR(VCPA,VPA - EPA VCP2,VPA2 - EPA2)
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ECM
A54291
VCP1
VCP2
EP2
EP1
A53775
EPA2
VPA
EPA
VPA2
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-125
278
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P1121
ACCELATOR PEDAL POSITION SENSOR
RANGE/PERFOMANCE PROBLEM
CIRCUIT DESCRIPTION
Refer to DTC P1120 on page
.
DTC No.
DTC Detection Condition
Trouble Area
P1121
Condition (a) continues for 2.0 seconds:
(IDL ON: 10 seconds)
(a) Difference between VPA and VPA2 is out of threshold
(b) IDL is OFF
Accelerator pedal position sensor
ECM
WIRING DIAGRAM
Refer to DTC P1120 on page
.
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 ACCELERATOR PEDAL ASSY(POSITION SENSOR)
(a)
Disconnect the accelerator pedal position sensor con-
nector.
(b)
Using an ohmmeter, measure the resistance between
each terminals.
Resistance: at 20
°
C (68
°
F)
Terminals
Resistance
VCP1 - EP1
VCP2 - EP2
2.25 - 4.75 k
Ω
NG
Go to step 3
OK
2
INSPECT ECM(VPA - EPA, VPA2 - EPA2)
(a)
Measure the voltage between terminals VPA and EPA,
and VPA2 and EPA2 of the ECM connector.
A
l
t
d l
Voltage
Accelerator pedal
VPA - EPA
VPA2 - EPA2
Released
0.5 - 1.1 V
0.9 - 2.3 V
Depressed
3.0 - 4.6 V
3.4 - 5.0 V
OK
CHECK AND REPLACE ECM
NG
055CL-03
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