Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 86

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–299

ES

FAIL-SAFE

When this DTC, 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

Refer to DTC P2102 (See page 

ES-283

).

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.

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

ENHANCED OBD II / DTC INFO / CURRENT CODES.

(e) Read DTCs.

Result

HINT:
If any DTCs other than P2119 are output, troubleshoot 
those DTCs first.

B

A

(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester ON.
(d) Clear DTCs (See page 

ES-38

).

(e) Allow the engine to idle for 15 seconds.
CAUTION:
Exercise extreme care and take precautions at steps (f) 
and (g) below. Failure to do so may result in the vehicle 
unexpectedly rolling away.
(f) Securely apply the parking brake and move the gear 
selector lever to the D position.

1

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2119)

Display (DTC Output)

Proceed To

P2119

A

P2119 and other DTCs

B

GO TO DTC CHART (See page 

ES-57

)

2

CHECK WHETHER DTC OUTPUT RECURS (DTC P2119)

ES–300

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

(g) While depressing the brake pedal securely, fully depress 
the accelerator pedal for 5 seconds.
(h) Select the following menu items: DIAGNOSIS / 
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(i) Read DTCs.
HINT:
The voltage output of the throttle position sensor can be 
checked during step (g) using an intelligent tester. Variations 
in the voltage output indicate that the throttle actuator is in 
operation. To check the voltage output using an intelligent 
tester, select the following menu items: DIAGNOSIS / 
ENHANCED OBD II / DATA LIST / PRIMARY / THROTTLE 
POS #1.
OK:

No DTC output.

NG

OK

REPLACE THROTTLE WITH MOTOR BODY 
ASSEMBLY (See page 

ES-428

)

CHECK FOR INTERMITTENT PROBLEMS

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–301

ES

HINT:
These DTCs relate to the Accelerator Pedal Position (APP) sensor.

DESCRIPTION

HINT:
This ETCS (Electronic Throttle Control System) does not use a throttle cable.
The Accelerator Pedal Position (APP) sensor is mounted on the accelerator pedal bracket and has 2 
sensor circuits: VPA (main) and VPA2 (sub). This sensor is a non-contact type, and uses Hall-effect 
elements, in order to yield accurate signals, even in extreme driving conditions, such as at high speeds as 
well as very low speeds. The voltage, which is applied to terminals VPA and VPA2 of the ECM, varies 
between 0 V and 5 V in proportion to the operating angle of the accelerator pedal (throttle valve). A signal 
from VPA indicates the actual accelerator pedal opening angle (throttle valve opening angle) and is used 
for engine control. A signal from VPA2 conveys the status of the VPA circuit and is used to check the APP 
sensor itself.
The ECM monitors the actual accelerator pedal opening angle (throttle valve opening angle) through the 
signals from VPA and VPA2, and controls the throttle actuator according to these signals.

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

ES–302

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

DTC No.

DTC Detection Conditions

Trouble Areas

P2120

VPA fluctuates rapidly beyond upper and lower malfunction thresholds for 0.5 
seconds or more (1 trip detection logic)

•

Accelerator Pedal Position (APP) sensor

•

ECM

P2122

VPA 0.4 V or less for 0.5 seconds or more when accelerator pedal fully 
released (1 trip detection logic)

•

APP sensor

•

Open in VCP1 circuit

•

Open or ground short in VPA circuit

•

ECM

P2123

VPA 4.8 V or more for 2.0 seconds or more (1 trip detection logic)

•

APP sensor

•

Open in EPA circuit

•

ECM

P2125

VPA2 fluctuates rapidly beyond upper and lower malfunction thresholds for 
0.5 seconds or more (1 trip detection logic)

•

APP sensor

•

ECM

P2127

VPA2 1.2 V or less for 0.5 seconds or more when accelerator pedal fully 
released (1 trip detection logic)

•

APP sensor

•

Open in VCP2 circuit

•

Open or ground short in VPA2 circuit

•

ECM

P2128

Conditions (a) and (b) continue for 2.0 seconds or more (1 trip detection 
logic)
(a) VPA2 4.8 V or more
(b) VPA between 0.4 V and 3.45 V

•

APP sensor

•

Open in EPA2 circuit

•

ECM

P2138

Condition (a) or (b) continues for 2.0 seconds or more (1 trip detection logic)
(a) Difference between VPA and VPA2 0.02 V or less
(b) VPA 0.4 V or less and VPA2 1.2 V or less

•

Short between VPA and VPA2 circuits

•

APP sensor

•

ECM

Accelerator Pedal Position Sensor

Magnet

ECM

3.4 to 5.0
2.6 to 4.5

1.6

0.8

5

VPA

EPA

VCPA

VPA2

EPA2

VCP2

Usable Range

Accelerator Pedal Turning Angle (deg)

*1: Accelerator Pedal Fully Released

*2: Accelerator Pedal Fully Depressed

Accelerator Pedal Position Sensor Output Voltage (V)

*1

0

25

*2

Magnet

IC No.1

IC No.2

15.9

A115889E06