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 or OBD II scan tool. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

When using intelligent tester:

READ VALUE OF INTELLIGENT TESTER (THROTTLE VALVE OPENING PERCENTAGE)

Connect an intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester ON.
Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS.

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

Result

RESULT

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

B : CHECK INTERMITTENT PROBLEMS

C : Go to step 4

Fig 1: Identifying Accelerator Pedal Positions

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 resistance

TESTER CONNECTIONS - SPECIFIED CONDITIONS (1 OF 2)

Tester Connections	Throttle Valve Positions	Specified Conditions
VC (T1-1) - E2 (T1-2)	-	Between 2.5 k and 6.0 k
VTA (T1-3) - E2 (T1-2)	Fully closed	Between 0.2 k and 5.7 k
VTA (T1-3) - E2 (T1-2)	Fully open	Between 2.0 k and 10.2 k

Reconnect the TP sensor connector.

NG : REPLACE THROTTLE POSITION SENSOR

Fig 2: Inspecting Throttle Position Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 ECM connector.

Standard resistance

TESTER CONNECTIONS - SPECIFIED CONDITIONS (2 OF 2)

Tester Connections	Throttle Valve Positions	Specified Conditions
VC (E3-18) - E2 (E3-28)	-	Between 2.5 k and 6.0 k
VTA (E3-21) - E2 (E3-28)	Fully closed	Between 0.2 k and 5.7 k
VTA (E3-21) - E2 (E3-28)	Fully open	Between 2.0 k and 10.2 k

Check the resistance.

Standard resistance (Check for short)

TESTER CONNECTIONS - SPECIFIED CONDITIONS (CHECK FOR SHORT)

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

Reconnect the ECM connector.

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 3: Checking Harness And Connector (ECM - Throttle Position Sensor)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE ECM

INSPECT THROTTLE POSITION SENSOR

Disconnect the T1 TP sensor connector.

Measure the resistance between the terminals of the TP sensor.

Standard resistance

TESTER CONNECTIONS - SPECIFIED CONDITIONS

Tester Connections	Throttle Valve Positions	Specified Conditions
VC (T1-1) - E2 (T1-2)	-	Between 2.5 k and 6.0 k
VTA (T1-3) - E2 (T1-2)	Fully closed	Between 0.2 k and 5.7 k
VTA (T1-3) - E2 (T1-2)	Fully open	Between 2.0 k and 10.2 k

Reconnect the TP sensor connector.

NG : REPLACE THROTTLE POSITION SENSOR

Fig 4: Inspecting Throttle Position Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 resistance (Check for open)

TESTER CONNECTIONS - SPECIFIED CONDITIONS (CHECK FOR OPEN)

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

Standard resistance (Check for short)

TESTER CONNECTIONS - SPECIFIED CONDITIONS (CHECK FOR SHORT)

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

Reconnect the TP sensor connector.
Reconnect the ECM connector.

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 5: Checking Harness And Connector (ECM - Throttle Position Sensor)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE ECM

When Using OBD II Scan Tool:

INSPECT THROTTLE POSITION SENSOR

Disconnect the T1 Throttle Position (TP) sensor connector.

Measure the resistance between the terminals of the TP sensor.

Standard resistance

TESTER CONNECTIONS - SPECIFIED CONDITIONS (1 OF 2)

Tester Connections	Throttle Valve Positions	Specified Conditions
VC (T1-1) - E2 (T1-2)	-	Between 2.5 k and 6.0 k
VTA (T1-3) - E2 (T1-2)	Fully closed	Between 0.2 k and 5.7 k
VTA (T1-3) - E2 (T1-2)	Fully open	Between 2.0 k and 10.2 k

Reconnect the TP sensor connector.

NG : REPLACE THROTTLE POSITION SENSOR

Fig 6: Inspecting Throttle Position Sensor

OK : GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Disconnect the E3 ECM connector.

Measure the resistance between the terminals of the ECM connector.

Standard resistance

TESTER CONNECTIONS - SPECIFIED CONDITIONS (2 OF 2)

Tester Connections	Throttle Valve Positions	Specified Conditions
VC (E3-18) - E2 (E3-28)	-	Between 2.5 k and 6.0 k
VTA (E3-21) - E2 (E3-28)	Fully closed	Between 0.2 k and 5.7 k
VTA (E3-21) - E2 (E3-28)	Fully open	Between 2.0 k and 10.2 k

Check the resistance.

Standard resistance (Check for short)

TESTER CONNECTIONS - SPECIFIED CONDITIONS (CHECK FOR SHORT)

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

Reconnect the ECM connector.

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 7: Checking Harness And Connector (Throttle Position Sensor - ECM)

OK : REPLACE ECM