Toyota Fortuner. Dtc P0120/41 Throttle / Pedal Position Sensor / Switch A Circuit

The throttle position sensor is mounted on the throttle body and it detects the opening angle of the throttle valve. This sensor is electronically controlled and uses Hall-effect elements so that accurate control and reliability can be obtained. The throttle position sensor has 2 sensor elements/signal outputs: VTA1 and VTA2. VTA1 is used to detect the throttle opening angle and VTA2 is used to detect a malfunction in VTA1. Voltage applied to VTA1 and VTA2 changes between 0 V and 5 V in proportion to the opening angle of the throttle valve. The ECM performs several checks to confirm proper operation of the throttle position sensor and VTA1.
The ECM judges the actual opening angle of the throttle valve from these signals input from terminals VTA1 and VTA2, and the ECM controls the throttle motor, which controls the throttle valve angle properly in response to driver input.

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.
Dtc
P0120/41 Throttle / Pedal Position Sensor / Switch A Circuit

DTC No.	DTC Detection Condition	Trouble Area
-	Conditions of DTC P0120/41, P0122/41, P0123/41, P0220/41, P0222/41 or P0223/41 continue for 2 seconds (open or short in throttle position sensor circuit)	-
P0120/41	Output voltage of VTA1 quickly fluctuates up and down beyond upper and lower malfunction thresholds	Throttle position sensor (built into throttle body) ECM
P0122/41	VTA1 is 0.2 V or less	Throttle position sensor (built into throttle body) Short in VTA1 circuit Open in VC circuit ECM
P0123/41	VTA1 is 4.8 V or more	Throttle position sensor (built into throttle body) Open in VTA1 circuit Open in E2 circuit Short in VC and VTA1 circuits ECM
P0220/41	Output voltages of VTA1 and VTA2 quickly fluctuate up and down beyond their respective upper and lower malfunction thresholds	Throttle position sensor (built into throttle body) ECM
P0222/41	VTA2 is 0.5 V or less	Throttle position sensor (built into throttle body) Short in VTA2 circuit Open in VC circuit ECM
P0223/41	VTA2 is 4.8 V or more, VTA1 is between 0.2 V and 1.8 V	Throttle position sensor (built into throttle body) Open in VTA2 circuit Open in E2 circuit Short in VC and VTA2 circuits ECM
P2135/41	Condition (a) continues for 0.5 seconds or more, or condition (b) continues for 0.4 seconds or more: (a) Difference between VTA1 and VTA2 is 0.02 V or less (b) VTA1 is 0.2 V or less and VTA2 is 0.5 V or less	Short in VTA1 and VTA2 circuits Throttle position sensor (built into throttle body) ECM

NOTICE:

When a malfunction is detected, the throttle valve is locked at a certain opening angle. Also, all electronically controlled throttle operations are canceled until the system returns to normal and the ignition switch is turned OFF.

HINT:

When any of these DTCs is stored, check the throttle valve opening angle by entering the following menus: Powertrain / Engine and ECT / Data List / All Data / Throttle Position No. 1 and Throttle Position No. 2.
Throttle Position No. 1 is the VTA1 signal, and Throttle Position No. 2 is the VTA2 signal.

Reference (Normal condition):

Tester Display	Accelerator Pedal Fully Released	Accelerator Pedal Fully Depressed
Throttle Position No. 1	0.5 to 1.1 V	3.2 to 4.8 V
Throttle Position No. 2	2.1 to 3.1 V	4.6 to 4.98 V

MONITOR DESCRIPTION

The ECM uses the throttle position sensor to monitor the throttle valve opening angle.

There is a specific voltage difference expected between VTA1 and VTA2 for each throttle opening angle.
If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a fault and will set a DTC.
VTA1 and VTA2 each have a specific voltage operating range.
If VTA1 or VTA2 is out of the normal operating range, the ECM interprets this as a fault and will set a DTC.
VTA1 and VTA2 should never have similar voltage levels.
If VTA1 is within 0.02 V of VTA2, the ECM interprets this as a short circuit in the throttle position sensor system and will set a DTC.
This monitor runs for 2 seconds (the first 2 seconds of engine idle) after the engine is started (1 trip detection logic).

FAIL-SAFE

If the ETCS is malfunctioning, the ECM cuts off the current to the throttle actuator. The throttle control valve returns to a predetermined throttle position (approximately 6.5°) by the force of the return spring.
Then, required engine power is calculated by using the ignition timing and accelerator pedal position. The engine is controlled by intermittent fuel cut.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven at minimum speed. If the accelerator pedal is depressed quickly, the vehicle may speed up and slow down erratically.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

If DTCs related 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 the intelligent tester. Freeze frame data records the engine conditions 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.

When using intelligent tester:

1.READ DATA LIST (THROTTLE POSITION NO. 1, THROTTLE POSITION NO. 2)

Connect the intelligent tester to the DLC3.

Turn the ignition switch ON and turn the intelligent tester ON.

Enter the following menus: Powertrain / Engine and ECT / Data List / Throttle Position and Throttle Position No. 2.

Read the values displayed on the intelligent tester.

Result:

TP No. 1 (VTA1) When AP Released	TP No. 2 (VTA2) When AP Released	TP No. 1 (VTA1) When AP Depressed	TP No. 2 (VTA2) When AP Depressed	Suspected Area	Proceed to
0 to 0.2 V	0 to 0.2 V	0 to 0.2 V	0 to 0.2 V	VC circuit open	A
4.5 to 5.0 V	4.5 to 5.0 V	4.5 to 5.0 V	4.5 to 5.0 V	E2 circuit open	A
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	A
0.6 to 1.4 V (Fail-safe)	0 to 0.2 V, or 4.5 to 5.0 V	0.6 to 1.4 V (Fail-safe)	0 to 0.2 V, or 4.5 to 5.0 V	VTA2 circuit open or ground short	A
0.5 to 1.1 V	2.1 to 3.1 V	3.2 to 4.8 V (Not fail-safe)	4.6 to 5.0 V (Not fail-safe)	Throttle position sensor circuit is normal	B

HINT:

TP stands for Throttle Position, and AP stands for Accelerator Pedal.
VTA1 is expressed as a percentage, and VTA2 is expressed as a voltage.

Go to step 5

A

2.CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Disconnect the T1 throttle body connector.

Disconnect the E11 ECM connector.

Measure the resistance of the wire harness side connectors.

Standard resistance:

Tester Connection	Specified Condition
T1-5 (VC) - E11-18 (VC)	Below 1 Ω
T1-6 (VTA) - E11-20 (VTA1)	Below 1 Ω
T1-4 (VTA2) - E11-19 (VTA2)	Below 1 Ω
T1-3 (E2) - E11-28 (E2)	Below 1 Ω
T1-5 (VC) or E11-18 (VC) - Body ground	10 kΩ or higher
T1-6 (VTA) or E11-20 (VTA1) - Body ground	10 kΩ or higher
T1-4 (VTA2) or E11-19 (VTA2) - Body ground	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.CHECK ECM (VC VOLTAGE)

Disconnect the T1 throttle body connector.

Turn the ignition switch ON.

Measure the voltage of the ECM connector.
Standard voltage:
Tester Connection
Specified Condition
E11-18 (VC) - E11-28 (E2)
4.5 to 5.5 V

REPLACE ECM

OK

4.REPLACE THROTTLE BODY ASSEMBLY

NEXT

5.CHECK IF DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)

Clear the DTCs (Toyota Fortuner RM000000ZPW007X.html).

Start the engine.

Idle the engine for 15 seconds or more.

Connect the intelligent tester to the DLC3.

Turn the intelligent tester ON.

Enter the following menus: Powertrain / Engine and ECT / DTC.

Read DTCs.
Result:
Display (DTC Output)
Proceed to
One or more of P0120/41, P0122/41, P0123/41, P0220/41, P0222/41, P0223/41 and P2135/41
A
No output
B

SYSTEM OK

REPLACE ECM

When not using intelligent tester:

1.CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Disconnect the T1 throttle body connector.

Disconnect the E11 ECM connector.

Measure the resistance of the wire harness side connectors.

Standard resistance:

Tester Connection	Specified Condition
T1-5 (VC) - E11-18 (VC)	Below 1 Ω
T1-6 (VTA) - E11-20 (VTA1)	Below 1 Ω
T1-4 (VTA2) - E11-19 (VTA2)	Below 1 Ω
T1-3 (E2) - E11-28 (E2)	Below 1 Ω
T1-5 (VC) or E11-18 (VC) - Body ground	10 kΩ or higher
T1-6 (VTA) or E11-20 (VTA1) - Body ground	10 kΩ or higher
T1-4 (VTA2) or E11-19 (VTA2) - Body ground	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.CHECK ECM (VC VOLTAGE)

Disconnect the T1 throttle body connector.

Turn the ignition switch ON.

Measure the voltage of the ECM connector.
Standard voltage:
Tester Connection
Specified Condition
E11-18 (VC) - E11-28 (E2)
4.5 to 5.5 V

REPLACE ECM

OK

3.REPLACE THROTTLE BODY ASSEMBLY

NEXT

4.CHECK IF DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)

Clear the DTCs (Toyota Fortuner RM000000ZPW007X.html).

Start the engine.

Idle the engine for 15 seconds or more.

Read DTCs (Toyota Fortuner RM000000ZPW007X.html).
Result:
Display (DTC Output)
Proceed to
One or more of P0120/41, P0122/41, P0123/41, P0220/41, P0222/41, P0223/41 and P2135/41
A
No output
B

SYSTEM OK

REPLACE ECM

Tester Connection	Specified Condition
E11-18 (VC) - E11-28 (E2)	4.5 to 5.5 V

Display (DTC Output)	Proceed to
One or more of P0120/41, P0122/41, P0123/41, P0220/41, P0222/41, P0223/41 and P2135/41	A
No output	B