Toyota FJ Cruiser (GSJ 10, 15 series). Manual — part 83

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–287

ES

DESCRIPTION

The throttle actuator is operated by the ECM and opens and closes the throttle valve using gears.
The opening angle of the throttle valve is detected by the Throttle Position (TP) sensor, which is mounted
on the throttle body. The TP sensor provides feedback to the ECM. This feedback allows the ECM to
appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to
driver inputs.
HINT:
This ETCS (Electronic Throttle Control System) does not use a throttle cable.

MONITOR DESCRIPTION

The ECM monitors the electrical current through the electronic actuator, and detects malfunctions and
open circuits in the throttle actuator based on this value. If the current is outside the standard range, the
ECM determines that there is a malfunction in the throttle actuator. In addition, if the throttle valve does
not function properly (for example, stuck on), the ECM determines that there is a malfunction. The ECM
then illuminates the MIL and sets a DTC.
Example:
When the electrical current is more than 7 A, or less than 0.5 A and the throttle actuator duty ratio
exceeds 80 %, the ECM interprets this as the current being outside the standard range, and illuminates
the MIL and sets a DTC.
If the malfunction is not repaired successfully, a DTC is set when the engine is quickly revved to a high
rpm several times after the engine has idled for 5 seconds after engine start.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

P2102:

DTC

P2102

Throttle Actuator Control Motor Circuit Low

DTC

P2103

Throttle Actuator Control Motor Circuit High

DTC No.

DTC Detection Conditions

Trouble Areas

P2102

Conditions (a) and (b) continue for 2.0 seconds (1 trip
detection logic)
(a) Throttle actuator duty ratio 80 % or more
(b) Throttle actuator current 0.5 A or less

•

Open in throttle actuator circuit

•

Throttle actuator

•

ECM

P2103

Throttle actuator current 7 A or more for 0.6 seconds (1 trip
detection logic)

•

Short in throttle actuator circuit

•

Throttle actuator

•

Throttle valve

•

Throttle body assembly

•

ECM

Related DTCs

P2102: Throttle actuator current (low current)
P2103: Throttle actuator current (high current)

Required Sensors/Components (Main)

Throttle actuator (throttle body)

Required Sensors/Components (Related)

None

Frequency of Operation

Continuous

Duration

P2102: 2 seconds
P2103: 0.6 seconds

MIL Operation

Immediate

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

Electronic throttle actuator

ON

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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

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P2103:

TYPICAL MALFUNCTION THRESHOLDS

P2102:

P2103:

FAIL-SAFE

When either of these DTCs, as well as other DTCs relating to ETCS (Electronic Throttle Control System)
malfunctions, is set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to
the throttle actuator off, and the throttle valve is returned to a 6

° throttle angle by the return spring. The

ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition
timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue at a
minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.
Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned OFF.

WIRING DIAGRAM

Electronic throttle actuator drive duty

80 % or more

Electronic throttle actuator power supply voltage

8 V or more

Motor current change during latest 0.016 seconds

Less than 0.2 A

Electronic throttle actuator

ON

Either of the following conditions 1 or 2 met:

-

1. Electronic throttle actuator power supply voltage

8 V or more

2. Electronic throttle actuator power

ON

Battery voltage

8 V or more

Starter

OFF

Motor current

Less than 0.5 A

Hybrid IC diagnosis signal

Fail

Hybrid IC current limiter port

Fail

B14

Throttle Actuator

2

1

M+

M-

Shielded

ECM

M+

M-

GE01

Throttle Actuator
Control Circuit

4

B1

5

B1

17
B1

A133489E01

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

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INSPECTION PROCEDURE

HINT:
•

Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle
was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and
other data, from the time the malfunction occurred.

•

The throttle actuator current (THROTTLE MOT) and the throttle actuator duty ratio (THROTTLE OPN /
THROTTLE CLS) can be read using an intelligent tester. However the ECM shuts off the throttle
actuator current when the ETCS malfunctions.

(a) Disconnect the B14 throttle with motor body connector.
(b) Measure the resistance between the terminals of the

throttle control motor.
Standard Resistance

(c) Reconnect the throttle with motor body connector.

NG

OK

(a) Disconnect the B14 throttle with motor body connector.
(b) Disconnect the B1 ECM connector.
(c) Check the resistance.

Standard Resistance (Check for open)

Standard Resistance (Check for short)

(d) Reconnect the throttle with motor body connector.
(e) Reconnect the ECM connector.

NG

OK

1

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (RESISTANCE OF THROTTLE
CONTROL MOTOR)

Throttle with Motor Body Assembly

M+

M-

Component Side:

A059778E33

Tester Connections

Specified Conditions

M+ (2) - M- (1)

0.3 to 100

Ω at 20°C (68°F)

REPLACE THROTTLE WITH MOTOR BODY
ASSEMBLY (See page

ES-428

)

2

CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)

B14

Wire Harness Side:

Front View

ECM Connector

B1

Throttle with Motor Body Connector

M- M+

M-

M+

A116167E07

Tester Connections

Specified Conditions

M+ (B14-2) - M+ (B1-5)

Below 1

Ω

M- (B14-1) - M- (B1-4)

Tester Connections

Specified Conditions

M+ (B14-2) or M+ (B1-5) - Body ground

10 k

Ω or higher

M- (B14-1) or M- (B1-4) - Body ground

REPAIR OR REPLACE HARNESS OR
CONNECTOR

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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

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(a) Check for foreign objects between the throttle valve and

the housing.
OK:

No foreign objects between throttle valve and
housing.

NG

OK

(a) Check if the throttle valve opens and closes smoothly.

OK:

Throttle valve opens and closes smoothly.

NG

OK

3

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

REMOVE FOREIGN OBJECT AND CLEAN
THROTTLE BODY

4

INSPECT THROTTLE VALVE

REPLACE THROTTLE WITH MOTOR BODY
ASSEMBLY (See page

ES-428

)

REPLACE ECM (See page

ES-446

)