Toyota Sequoia (2005). Manual - part 143

–

DIAGNOSTICS

ENGINE

DI–367

561

DTC

P2119

Throttle Actuator Control Throttle Body
Range/Performance

CIRCUIT DESCRIPTION

The Electric Throttle Control System (ETCS) is composed of a throttle motor that operates the throttle valve,
a throttle position sensor that detects the opening angle of the throttle valve, an accelerator pedal position
sensor that detects the accelerator pedal position, and the ECM that controls the ETCS system. 
The ECM operates the throttle motor to position the throttle valve for proper response to driver inputs. The
throttle position sensor, mounted on the throttle body, detects the opening angle of the throttle valve and
provides this signal to the ECM so that the ECM can regulate the throttle motor.

DTC No.

DTC Detection Condition

Trouble Area

P2119

Throttle opening angle continues to vary greatly from target

throttle opening angle

(1 trip detection logic)

Electric throttle control system

Throttle body

MONITOR DESCRIPTION

The ECM determines the ”actual” throttle angle based on the throttle position sensor signal. The ”actual”
throttle position is compared to the ”target” throttle position commanded by the ECM. If the difference of
these two values exceeds a specified limit, the ECM interprets this as a fault in the ETCS (Electronic Throttle
Control System). The ECM turns 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.

MONITOR STRATEGY

Related DTCs

P2119

Electronic throttle control system failure

R

i d

/

t

Main sensors

Throttle actuator motor

Required sensors/components

Related sensors

Throttle position sensor

Frequency of operation

Continuous

Duration

1 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever this DTC is
not present

See page 

DI–18

The typical enabling condition is not avail-

able

–

DICFC–02

DI–368

–

DIAGNOSTICS

ENGINE

562

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

Difference between ”target throttle position” and ”actual
throttle position”

0.3 V or more

COMPONENT OPERATING RANGE

Standard Value

Commanded throttle position and current throttle position are nearly the same

WIRING DIAGRAM

Refer to DTC P2102 and P2103 on page 

DI–354

.

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

Are there any other codes (besides DTC P2119) being output?

PREPARATION:
(a)

Connect the hand–held tester to the DLC3.

(b)

Turn the ignition switch ON and push the hand–held tester main switch ON.

(c)

When using hand–held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.

CHECK:
Read the DTC using the hand–held tester.
RESULT:

Display (DTC Output)

Proceed to

P2119

A

”P2119” and other DTC

B

HINT:
If any other codes besides P2119 are output, perform the troubleshooting for those DTCs first.

B

Go to relevant DTC chart (See page 

DI–58

).

A

A21034

T14

Component Side:

M+

M–

Throttle Control Motor and Sensor

–

DIAGNOSTICS

ENGINE

DI–369

563

2

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–42

).

OK

3

Replace ECM and check DTC (Check if DTC outputs reoccur).

PREPARATION:
(a)

Replace ECM.

(b)

Clear the DTC (See page 

DI–43

).

(c)

Start and warm up the engine.

(d)

Run the engine at idle for 15 seconds or more.

CHECK:
Read the DTC using the hand–held tester (See page 

DI–43

).

OK:

No DTC output.

OK

System is normal.

NG

Replace throttle body.

DI–370

–

DIAGNOSTICS

ENGINE

564

DTC

P2120

Throttle/Pedal Position Sensor/Switch ”D”
Circuit

DTC

P2122

Throttle/Pedal Position Sensor/Switch ”D”
Circuit Low Input

DTC

P2123

Throttle/Pedal Position Sensor/Switch ”D”
Circuit High Input

DTC

P2125

Throttle/Pedal Position Sensor/Switch ”E”
Circuit

DTC

P2127

Throttle/Pedal Position Sensor/Switch ”E”
Circuit Low Input

DTC

P2128

Throttle/Pedal Position Sensor/Switch ”E”
Circuit High Input

DTC

P2138

Throttle/Pedal Position Sensor/Switch
”D”/”E” Voltage Correlation

HINT:
This is the repair procedure for the ”accelerator pedal position sensor”.

DID8G–01