Hand-Held Tester:

READ VALUE USING HAND-HELD TESTER (THROTTLE VALVE OPENING PERCENTAGE)

Connect a hand-held tester or OBD II scan tool to the DLC3.
Start the engine.
Turn the tester or scan tool ON.
On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS.

Read its value displayed on the tester when the accelerator pedal is released and depressed.

Result:

THROTTLE VALVE OPENING ANGLE POSITION

Throttle Valve Opening Angle (%)	Proceed To
0	A
From approximately 0 to 75	B
Approximately 100	C

Fig 1: Identifying Accelerator Pedal Release & Depress Position

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B : (See CHECK FOR INTERMITTENT PROBLEMS )
C : Go to step 4
A : GO TO NEXT STEP

INSPECT THROTTLE POSITION SENSOR

Disconnect the T1 Throttle Position (TP) sensor connector.

Measure the resistance between the terminals of the TP sensor.

Standard:

TESTER CONNECTIONS SPECIFICATIONS

Tester Connections	Throttle Valve Positions	Specified Conditions
VC (T1-1) - E2 (T1-2)	-	Between 2.5 kΩ and 5.9 kΩ
VTA (T1-3) - E2 (T1-2)	Fully closed	Between 0.2 kΩ and 5.7 kΩ
VTA (T1-3) - E2 (T1-2)	Fully open	Between 2.0 kΩ and 10.2 kΩ

Reconnect the TP sensor connector.

Fig 2: Disconnecting T1 Throttle Position Sensor Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE THROTTLE POSITION SENSOR
OK : GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (ECM - THROTTLE POSITION SENSOR)

Disconnect the E3 ECM connector.

Measure the resistance between the terminals of the E3 ECM connector.

Standard:

TESTER CONNECTIONS SPECIFICATIONS

Tester Connections	Throttle Valve Positions	Specified Conditions
VCC (E3-18) - E2 (E3-28)	-	Between 2.5 kΩ and 5.9 kΩ
VTA (E3-21) - E2 (E3-28)	Fully closed	Between 0.2 kΩ and 5.7 kΩ
VTA (E3-21) - E2 (E3-28)	Fully open	Between 2.0 kΩ and 10.2 kΩ

Fig 3: Disconnecting E3 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the resistance between the terminals of the E3 ECM connector.

Standard (Check for short):

TESTER CONNECTIONS SPECIFICATIONS

Tester Connections	Specified Conditions
VCC (E3-18) - Body ground	10 kΩ or higher
VTA (E3-28) - Body ground	10 kΩ or higher

Reconnect the ECM connector.

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR
OK : REPLACE ECM (See REPLACEMENT )

INSPECT THROTTLE POSITION SENSOR

Disconnect the T1 TP sensor connector.

Measure the resistance between the terminals of the TP sensor.

Standard:

TESTER CONNECTIONS SPECIFICATIONS

Tester Connections	Throttle Valve Positions	Specified Conditions
VC (T1-1) - E2 (T1-2)	-	Between 2.5 kΩ and 5.9 kΩ
VTA (T1-3) - E2 (T1-2)	Fully closed	Between 0.2 kΩ and 5.7 kΩ
VTA (T1-3) - E2 (T1-2)	Fully open	Between 2.0 kΩ and 10.2 kΩ

Reconnect the TP sensor connector.

Fig 4: Disconnecting T1 TP Sensor Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE THROTTLE POSITION SENSOR"
OK : GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (ECM - THROTTLE POSITION SENSOR)

Disconnect the E3 ECM connector.
Disconnect the T1 TP sensor connector.

Check the resistance.

Standard (Check for open):

TESTER CONNECTIONS SPECIFICATIONS

Tester Connections	Specified Conditions
VC (T1-1) - VCC (E3-18)	Below 1 Ω
VTA (T1-3) - VTA (E3-21)	Below 1 Ω
E2 (T1-2) - E2 (E3-28)	Below 1 Ω

Standard (Check for short):

TESTER CONNECTIONS SPECIFICATIONS

Tester Connections	Specified Conditions
VC (T1-1) or VCC (E3-18) - Body ground	10 kΩ or higher
VTA (T1-3) or VTA (E3-21) - Body ground	10 kΩ or higher

Fig 5: Disconnecting E3 ECM Connector

Reconnect the TP sensor connector.

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR
OK : REPLACE ECM (See REPLACEMENT )