Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Hand-held tester:

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

Connect the hand-held tester to the DLC3.
Turn the ignition switch ON.

Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS" and read its value displayed on the hand-held tester.

Result:

RESULT REFERENCE

Accelerator Pedal Operation	Throttle Valve Opening Position (%)	Proceed to
Releasing and depressing	0	A
	From approx. 0 to 75	B
	Approx. 100	C

Fig 1: Identifying Accelerator Pedal Position

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

INSPECT THROTTLE POSITION SENSOR

Disconnect the T1 throttle position sensor connector.

Measure the resistance between the terminals of the throttle position sensor.

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Throttle Valve	Specified Condition
VC (T1-1) - E2 (T1-2)	-	2.5 to 5.9 kΩ
VTA (T1-3) - E2 (T1-2)	Fully closed	0.2 to 5.7 kΩ
VTA (T1-3) - E2 (T1-2)	Fully open	2.0 to 10.2 kΩ

Reconnect the throttle position sensor connector.

Fig 2: Identifying Throttle Position Sensor Connector Terminals

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 CONNECTION AND SPECIFIED CONDITION

Tester Connection	Throttle Valve	Specified Condition
VC (E3-18) - E2 (E3-28)	-	2.5 to 5.9 kΩ
VTA(E3-21) - E2 (E3-28)	Fully closed	0.2 to 5.7 kΩ
VTA(E3-21) - E2 (E3-28)	Fully open	2.0 to 10.2 kΩ

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

Fig 3: Identifying E3 ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard (Check for short):

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
VC (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 throttle position sensor connector.

Measure the resistance between the terminals of the throttle position sensor.

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Throttle Valve	Specified Condition
VC (T1-1) - E2 (T1-2)	-	2.5 to 5.9 kΩ
VTA (T1-3) - E2 (T1-2)	Fully closed	0.2 to 5.7 kΩ
VTA (T1-3) - E2 (T1-2)	Fully open	2.0 to 10.2 kΩ

Reconnect the throttle position sensor connector.

Fig 4: Identifying Throttle Position Sensor Connector Terminals

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 throttle position sensor connector.

Check the resistance between the wire harness side connectors.

Standard (Check for open):

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
VC (T1-1) - VC (E3-18)	Below 1 Ω
VTA (T1-3) - VTA (E3-21)
E2 (T1-2) - E2 (E3-28)

Fig 5: Identifying E3 ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard (Check for short):

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
VC (T1-1) or VC (E3-18) - Body ground	10 kΩ or higher
VTA (T1-3) or VTA (E3-21) - Body ground	10 kΩ or higher

Reconnect the throttle position sensor connector.
Reconnect the ECM connector.

Fig 6: Identifying Throttle Position Sensor Connector Terminals

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

OBD II scan tool (excluding hand-held tester):

INSPECT THROTTLE POSITION SENSOR

Disconnect the T1 throttle position sensor connector.

Measure the resistance between the terminals of the throttle position sensor.

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Throttle Valve	Specified Condition
VC (T1-1) - E2 (T1-2)	-	2.5 to 5.9 kΩ
VTA (T1-3) - E2 (T1-2)	Fully closed	0.2 to 5.7 kΩ
VTA (T1-3) - E2 (T1-2)	Fully open	2.0 to 10.2 kΩ

Reconnect the throttle position sensor connector.

Fig 7: Identifying Throttle Position Sensor Connector Terminals

NG : REPLACE 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 E3 ECM connector.

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Throttle Valve	Specified Condition
VC (E3-18) - E2 (E3-28)	-	2.5 to 5.9 kΩ
VTA(E3-21) - E2 (E3-28)	Fully closed	0.2 to 5.7 kΩ
VTA(E3-21) - E2 (E3-28)	Fully open	2.0 to 10.2 kΩ

Fig 8: Identifying E3 ECM Connector Terminals

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

Standard (Check for short):

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
VC (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 )