Toyota Sequoia (2005). Manual - part 145

A19759

A37
Accelerator Pedal Position Sensor

VPA1

EP1

VCP1

G–W

L–Y

ECM

E4

21

19

VPA2

EP2

VCP2

6

5

4

3

2

1

G–R

G–B

L–B

L–R

E4

E4

E4

E4

E4

26

27

18

20

VCP2

EPA2

VPA2

VCPA

EPA

VPA

–

DIAGNOSTICS

ENGINE

DI–375

569

WIRING DIAGRAM

FI7052

Depressed

Released

DI–376

–

DIAGNOSTICS

ENGINE

570

INSPECTION PROCEDURE

HINT:
Read freeze frame data using 

the hand−held tester

. Freeze frame data records the engine conditions when

a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air–fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.

1

Connect hand–held tester, and read the voltage for accelerator pedal position
sensor data.

PREPARATION:
(a)

Connect the hand–held tester to the DLC3.

(b)

Turn the ignition switch ON and push the hand–held tes-
ter main switch ON.

(c)

Enter the following menu: DIAGNOSIS / ENHANCED
OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL
POS #2.

CHECK:
Read the voltage for the accelerator pedal position sensor data.
OK:

Standard:

Accelerator pedal

ACCEL POS #1

ACCEL POS #2

Released

0.5 to 1.1 V

1.2 to 2.0 V

Depressed

2.6 to 4.5 V

3.4 to 5.3 V

OK

Go to step 5.

NG

A21022

Wire Harness Side:

A37

Accelerator Pedal Position Sensor

VCP2

EPA2 VPA2 VCPA EPA

VPA

B17417

E4

VPA2

VCPA

VPA

EPA2

EPA

VCP2

–

DIAGNOSTICS

ENGINE

DI–377

571

2

Check for open and short in harness and connector in VCPA, VCP2, VPA, VPA2
EPA and EPA2 circuit between ECM and accelerator pedal position sensor.

PREPARATION:
(a)

Disconnect the A37 accelerator pedal position sensor
connector.

(b)

Disconnect the E4 ECM connector.

CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:

Standard:

Tester Connection

Specified Condition

VPA (A37–6) – VPA (E4–18)

Below 1 

Ω

EPA (A37–5) – EPA (E4–20)

Below 1 

Ω

VCPA (A37–4) – VCPA (E4–26)

Below 1 

Ω

VPA2 (A37–3) – VPA2 (E4–19)

Below 1 

Ω

EPA2 (A37–2) – EPA2 (E4–21)

Below 1 

Ω

VCP2 (A37–1) – VCP2 (E4–27)

Below 1 

Ω

VPA (A37–6) or VPA (E4–18) – 

Body ground

10 k

Ω

 or higher

EPA (A37–5) or EPA (E4–20) – 

Body ground

10 k

Ω

 or higher

VCPA (A37–4) or VCPA (E4–26) – 

Body ground

10 k

Ω

 or higher

VPA2 (A37–3) or VPA2 (E4–19) – 

Body ground

10 k

Ω

 or higher

EPA2 (A37–2) or EPA2 (E4–21) – 

Body ground

10 k

Ω

 or higher

VCP2 (A37–1) or VCP2 (E4–27) – 

Body ground

10 k

Ω

 or higher

NG

Repair or replace harness and connector.

OK

B17448

EPA (–)

VCPA (+)

EPA2 (–)

VCP2 (+)

Accelerator Pedal 
Position Sensor 
Connector

E4

A37

DI–378

–

DIAGNOSTICS

ENGINE

572

3

Check voltage between terminals VCPA and EPA, and VCP2 and EPA2 of ECM
terminals.

PREPARATION:
(a)

Turn the ignition switch ON.

(b)

Disconnect the A37 accelerator pedal position sensor
connector.

CHECK:
Measure the voltage between the specified terminals of the E4
ECM connector.
OK:

Standard:

Tester Connection

Specified Condition

VCPA (E4–26) – EPA (E4–20)

4.5 to 5.5 V

VCP2 (E4–27) – EPA2 (E4–21)

4.5 to 5.5 V

NG

Replace ECM (See page 

SF–80

).

OK

4

Replace accelerator pedal assembly (See page 

SF–78

).

Go