Toyota Sequoia (2005). Manual - part 140

–

DIAGNOSTICS

ENGINE

DI–355

549

MONITOR STRATEGY

R l t d DTC

P2102

Throttle actuator control motor current 
(Low current)

Related DTCs

P2103

Throttle actuator control motor current 

(High current)

Required sensors/components

Throttle actuator motor

Frequency of operation

Continuous

Duration

2 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

The monitor will run whenever these

DTCs are not present

See page 

DI–18

P2102:

Throttle motor

ON

Duty–cycle ratio to open throttle actuator

80%

–

Throttle actuator power supply

8 V

–

Current motor current – Motor current at
0.016 sec. before

–

0.2 A

P2103:

Throttle motor

ON

Either of the following conditions is met:

Condition 1 or 2

1. Throttle actuator power supply

8 V

–

2. Throttle actuator power

ON

Battery voltage

8 V

–

Starter

OFF

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

P2102:

Throttle motor current

Less than 0.5 A (when motor drive duty 80% or more)

P2103:

Throttle motor current

More than 10 A (0.1 sec.)

More than 7 A (0.6 sec.)

WIRING DIAGRAM

Refer to DTC P0120 on page 

DI–127

.

A21034

T14

Component Side:

M+

M–

Throttle Control Motor and Sensor

DI–356

–

DIAGNOSTICS

ENGINE

550

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

Check throttle control motor.

PREPARATION:
Disconnect the throttle control motor and sensor connector.
CHECK:
Measure the resistance between terminals of the throttle con-
trol motor.
OK:

Standard:

Tester Connection

Specified Condition

M+ (T14–2) – M– (T14–1)

0.3 to100 

Ω

 (20

°

C (68

°

F))

NG

Replace throttle body (See page 

SF–39

).

OK

A21022

T14

M+

M–

Wire Harness Side:
Throttle Control Motor and Sensor

B17412

M+

M–

E8

ECM Connector

–

DIAGNOSTICS

ENGINE

DI–357

551

2

Check for open and short in harness and connector between throttle control mo-
tor and ECM.

PREPARATION:
(a)

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

(b)

Disconnect the E8 ECM connector.

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

Standard:

Tester Connection

Specified Condition

M+ (T14–2) – M+ (E8–3)

Below 1 

Ω

M– (T14–1) – M– (E8–2)

Below 1 

Ω

M+ (T14–2) or M+ (E8–3) – 

Body ground

10 k

Ω

 or higher

M– (T14–1) or M– (E8–2) – 

Body ground

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK

3

Visually check throttle valve.

CHECK:
Check the area between the throttle valve and the housing for foreign objects.
Also, check if the valve can open and close smoothly.
OK:

The throttle valve is not contaminated by foreign objects and can move smoothly.

NG

Remove foreign object and clean throttle body.

OK

Replace ECM (See page 

SF–80

).

DI–358

–

DIAGNOSTICS

ENGINE

552

DTC

P2111

Throttle Actuator Control System 
–Stuck Open

DTC

P2112

Throttle Actuator Control System 
–Stuck Closed

CIRCUIT DESCRIPTION

The throttle motor is operated by the ECM. It opens and closes the throttle valve using gears. The opening
angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body.
The throttle position sensor provides feedback to the ECM to control the throttle motor and set the throttle
valve angle in response to driver input.
HINT:
This Electrical Throttle Control System (ETCS) does not use a throttle cable.

DTC No.

DTC Detection Condition

Trouble Area

P2111

Throttle motor locked during ECM order to close.

(1 trip detection logic)

Throttle control motor and sensor circuit

Throttle control motor and sensor

P2112

Throttle motor locked during ECM order to open.

(1 trip detection logic)

Throttle control motor and sensor

Throttle body

Throttle valve

MONITOR DESCRIPTION

The ECM concludes that there is a malfunction of the ETCS (Electronic Throttle Control System) when the
throttle valve remains at a fixed angle despite high drive current from the ECM. The ECM will turn on the MIL
and a DTC is set.

FAIL SAFE

If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle
control motor. The throttle control valve returns to a predetermined opening angle (approximately 16

°

) by

the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (inter-
mittent fuel–cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the
vehicle to continue at a minimum speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a ”pass” condition is detected and then the ignition switch is turned OFF, the fail–safe operation will stop
and the system will return to normal condition.

DICFA–02