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 

05-120

.

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 

05-120

.

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