Toyota Sequoia (2005). Manual - part 82

–

DIAGNOSTICS

ENGINE

DI–131

325

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these

DTCs are not present

See page 

DI–18

Throttle control motor power

ON

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

P0120:

VTA1 voltage

0.2 V or less, or 4.8 V or more

P0122:

VTA1 voltage

0.2 V or less

P0123:

VTA1 voltage

4.8 V or more

P0220:

VTA2 voltage

0.5 V or less, or 4.8 V or more

P0222:

VTA2 voltage

0.5 V or less

P0223:

Both of the following conditions are met for 2 sec. or more:

Condition 1 and 2

1. VTA1 voltage

0.2 to 1.8 V

2. VTA2 voltage

4.8 V or more

P2135:

Different between VTA1 and VTA2 voltage

0.02 V or less

Both of the following conditions are met:

Condition 1 and 2

1. VTA1 voltage

0.2 V or less

2. VTA2 voltage

0.5 V or less

COMPONENT OPERATING RANGE

Parameter

Standard Value

Throttle position sensor VTA1 voltage

0.6 to 3.96 V

Throttle position sensor VTA2 voltage

2.25 to 5.0 V

A19212

T14
Throttle Control Motor 
and Position Sensor

4

6

1

2

G–W

G–B

P–L

B–Y

28

23

19

20

4

5

17

E8

P

V

ECM

E2

VC

VTA2

VTA1

3

5

(Shielded)

L–R

M–

M+

GE01

E8

E8

E8

E8

E8

E8

DI–132

–

DIAGNOSTICS

ENGINE

326

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

If DTCs related to different system that have terminal E2 as the ground terminal are output simulta-
neously, terminal E2 may have an open circuit.

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.

–

DIAGNOSTICS

ENGINE

DI–133

327

1

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

PREPARATION:
(a)

Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / THROTTLE POS
and THROTTLE POS #2.

CHECK:
Read voltage value displayed on the hand–held tester.
OK:
RESULT:

Throttle position expressed as percentage and voltage

Accelerator pedal released

Accelerator pedal depressed

Trouble area

Proceed to

THROTTLE POS

(VTA1)

THROTTLE POS #2

(VTA2)

THROTTLE POS

(VTA1)

THROTTLE POS #2

(VTA2)

Trouble area

Proceed to

0 %

0 to 0.2 V

0 %

0 to 0.2 V

VC circuit open

100 %

4.5 to 5.5 V

100 %

4.5 to 5.5 V

E2 circuit open

0 % or 100 %

2.1 to 3.1 V 

(Fail safe)

0 % or 100 %

2.1 to 3.1 V 

(Fail safe)

VTA1 circuit open or

ground short

A

about 16 %

(Fail safe)

0 to 0.2 or 4.5 to 5.5 V

about 16 %

(Fail safe)

0 to 0.2 or 4.5 to 5.5 V

VTA2 circuit open or

ground short

10 to 24 %

2.15 to 3.05 V

64 to 96 %

(Does not fail safe)

4.5 to 5.5 V

(Does not fail safe)

Throttle position sen-

sor circuit is normal

B

B

Go to step 5.

A

A21022

Throttle Control Motor and Sensor

VC

VTA2

VTA1

E2

Wire Harness Side

T14

Front View

B17412

VC

E2

E8

ECM Connector

VTA2

VTA1

DI–134

–

DIAGNOSTICS

ENGINE

328

2

Check for open and short in harness and connector between ECM and throttle
position sensor.

PREPARATION:
(a)

Disconnect the T14 throttle control motor and sensor con-
nector.

(b)

Disconnect the E8 ECM connector.

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

Standard:

Tester Connection

Specified Condition

VC (T14–5) – VC (E8–18)

Below 1 

Ω

VTA1 (T14–6) – VTA1 (E8–21)

Below 1 

Ω

VTA2 (T14–4) – VTA2 (E8–31)

Below 1 

Ω

E2 (T14–3) – E2 (E8–28)

Below 1 

Ω

VC (T14–5) or VC (E8–18) – 

Body ground

10 k

Ω

 or higher

VTA1 (T14–6) or VTA1 (E8–21) – 

Body ground

10 k

Ω

 or higher

VTA2 (T14–4) or VTA2 (E8–31) – 

Body ground

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK