Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 42

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–123

DTC No.

DTC Detection Conditions

Trouble Areas

P0120

Output voltage of VTA1 quickly fluctuates beyond lower and
upper malfunction thresholds for 2 seconds when accelerator
pedal depressed (1 trip detection logic)

•

Throttle Position (TP) sensor (built into throttle body)

•

ECM

P0122

Output voltage of VTA1 0.2 V or less for 2 seconds when
accelerator pedal depressed (1 trip detection logic)

•

TP sensor (built into throttle body)

•

Short in VTA1 circuit

•

Open in VC circuit

•

ECM

P0123

Output voltage of VTA1 4.535 V or more for 2 seconds when
accelerator pedal depressed (1 trip detection logic)

•

TP sensor (built into throttle body)

•

Open in VTA1 circuit

•

Open in E2 circuit

•

Short between VC and VTA1 circuits

•

ECM

P0220

Output voltage of VTA2 quickly fluctuates beyond lower and
upper malfunction thresholds for 2 seconds when accelerator
pedal depressed (1 trip detection logic)

•

TP sensor (built into throttle body)

•

ECM

4.65

VTA2

VTA1

2.55

2.25

0.93

0.69

5.0

Fail Safe Angle

Usable Range

Throttle Valve Opening Angle (degrees)

Sensor Output Voltage (V)

84°

6°

0°

ECM

VTA1

VTA2

Magnet

IC No. 1

IC No. 2

Throttle Position Sensor

Note:

The throttle valve opening angle detected by the sensor terminal
VTA1 is expressed as a percentage.

Between 10 % and 22 %: Throttle valve fully closed

Between 66 % and 98 %: Throttle valve fully open

Approximately 19 %: Fail-safe angle (6°)

A122559E02

ES–124

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

HINT:
•

When any of these DTCs are set, check the throttle valve opening angle by selecting the following
menu items on an intelligent tester: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS /
THROTTLE POS #1 AND THROTTLE POS #2.

•

THROTTLE POS #1 denotes the VTA1 signal, and THROTTLE POS #2 denotes the VTA2 signal .

Reference (Normal Condition)

MONITOR DESCRIPTION

The ECM uses the Throttle Position (TP) sensor to monitor the throttle valve opening angle. There are
several checks that the ECM performs to confirm the proper operation of the TP sensor.
•

A specific voltage difference is expected between the sensor terminals, VTA1 and VTA2, for each
throttle valve opening angle. If the difference between VTA1 and VTA2 is incorrect, the ECM interprets
this as a malfunction in the sensor, and sets a DTC.

•

VTA1 and VTA2 each have a specific voltage range. If VTA1 or VTA2 is outside the normal operating
range, the ECM interprets this as a malfunction in the sensor, and sets a DTC.

•

VTA1 and VTA2 should never be close to the same voltage level. If VTA1 is within 0.02 V of VTA2, the
ECM determines that there is a short circuit in the sensor, and sets a DTC.

If the malfunction is not repaired successfully, a DTC is set 10 seconds after the engine is next started.

MONITOR STRATEGY

P0222

Output voltage of VTA2 1.75 V or less for 2 seconds when
accelerator pedal depressed (1 trip detection logic)

•

TP sensor (built into throttle body)

•

Short in VTA2 circuit

•

Open in VC circuit

•

ECM

P0223

Output voltage of VTA2 4.8 V or more, and VTA1 between 0.2
V and 2.02 V, for 2 seconds when accelerator pedal depressed
(1 trip detection logic)

•

TP sensor (built into throttle body)

•

Open in VTA2 circuit

•

Open in E2 circuit

•

Short between VC and VTA2 circuits

•

ECM

P2135

Either condition (a) or (b) met (1 trip detection logic)
(a) Difference between output voltages of VTA1 and VTA2 0.02
V or less for 0.5 seconds or more
(b) Output voltage of VTA1 0.2 V or less, and VTA2 1.75 V or
less, for 0.4 seconds or more

•

Short between VTA1 and VTA2 circuits

•

TP sensor (built into throttle body)

•

ECM

Tester Display

Accelerator Pedal Fully Released

Accelerator Pedal Fully Depressed

THROTTLE POS #1

0.5 to 1.1 V

3.3 to 4.9 V

THROTTLE POS #2

2.1 to 3.1 V

4.6 to 5.0 V

Related DTCs

P0120: Throttle position sensor 1 range check (Fluctuating)
P0122: Throttle position sensor 1 range check (Low voltage)
P0123: Throttle position sensor 1 range check (High voltage)
P0220: Throttle position sensor 2 range check (Fluctuating)
P0222: Throttle position sensor 2 range check (Low voltage)
P0223: Throttle position sensor 2 range check (High voltage)
P2135: Throttle position sensor range check (Correlation)

Required Sensors/Components (Main)

Throttle position sensor

Required Sensors/Components (Related)

Frequency of Operation

Continuous

Duration

2 seconds: P0120, P0122, P0123, P0220, P0222 and P0223
(Accelerator pedal ON)
10 seconds: P0120, P0122, P0123, P0220, P0222 and P0223
(Accelerator pedal OFF)
Within 0.5 seconds: P2135

MIL Operation

Immediate

Sequence of Operation

None

DTC No.

DTC Detection Conditions

Trouble Areas

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–125

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

P0120:

P0122:

P0123:

P0220:

P0222:

P0223:

P2135:

COMPONENT OPERATING RANGE

FAIL-SAFE

When any of these DTCs, as well as other DTCs relating to ETCS (Electronic Throttle Control System)
malfunctions, are 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.

Monitor runs whenever following DTCs not present

None

VTA1 voltage

0.2 V or less, or 4.535 V or more

VTA1 voltage

0.2 V or less

VTA1 voltage

4.535 V or more

VTA2 voltage

1.75 V or less, or 4.8 V or more

VTA2 voltage

1.75 V or less

VTA2 voltage when VTA1 0.2 V or more, and 2.02 V or less

4.8 V or more

Either of following conditions A or B met:

Condition A

Difference between VTA1 and VTA2 voltages

0.02 V or less

Condition B

VTA1 voltage

0.2 V or less

VTA2 voltage

1.75 V or less

VTA1 voltage

0.69 to 4.05 V

VTA2 voltage

2.25 to 4.8 V

ES–126

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:
•

If other DTCs relating to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may have an open circuit.

•

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.

(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Select the following menu items: DIAGNOSIS /

ENHANCED OBD II / DATA LIST / ETCS / THROTTLE
POS #1 and THROTTLE POS #2.

(d) Check the values displayed on the tester.

Result

READ VALUE USING INTELLIGENT TESTER (THROTTLE POS #1 AND THROTTLE POS
#2)

Throttle Position Sensor (Built into Throttle Body)

ECM

VTA

VTA2

VTA1

VTA2

5 V

B14

A133411E01

TP#1 (VTA1)

When Accelerator

Pedal Released

TP#2 (VTA2)

When Accelerator

Pedal Released

TP#1 (VTA1)

When Accelerator

Pedal Depressed

TP#2 (VTA2)

When Accelerator

Pedal Depressed

Trouble Areas

Proceed To

0 to 0.2 V

VC circuit open

4.5 to 5.0 V

E2 circuit open

0 to 0.2 V, or 4.5 to

5.0 V

2.1 to 3.1 V

(Fail-safe)

0 to 0.2 V, or 4.5 to 5.0 V

2.1 to 3.1 V

(Fail-safe)

VTA1 circuit open

or ground short

Approximately 0.93

(Fail-safe)

0 to 0.2 V,

or 4.5 to 5.0 V

Approximately 2.55 V

(Fail-safe)

0 to 0.2 V,

or 4.5 to 5.0 V

VTA2 circuit open

or ground short

Content .. 40 41 42 43 ..