Inspection Procedure

HINT:

• If different 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 a hand-held tester or OBD II scan tool. 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.

Hand-held tester: 

1. Connect hand-held tester or OBD II scan tool, and read value of throttle valve opening percentage. 

   PREPARATION: 

   1. Connect the hand-held tester to DLC3.
   2. Turn the ignition switch to ON and turn the hand-held tester ON.
   3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS.

   CHECK: 

   Read the throttle valve opening percentage.

   OK: 

   THROTTLE VALVE OPENING PERCENTAGE - SPECIFICATION TABLE
   
   

   Throttle valve opening percentage (%)	Proceed To
   0	A
   From approximately 0 to 75	B
   Approximately 100	C

   Fig 1: Depressing Pedal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • B: Check for intermittent problems (See  PRE-CHECK   ). 
   • C: Go to step   4 . 
   • A: Go to next step. 
2. Inspect throttle position sensor. 

   PREPARATION: 

   Disconnect the throttle position sensor connector.

   CHECK: 

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

   OK: 

   tester CONNECTIONS AND SPECIFIED CONDITIONS TABLE
   
   

   Tester Connections	Throttle Valve	Specified Conditions
   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
   	Fully open	2.0 to 10.2 kΩ

   Fig 2: Inspecting Throttle Position Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG: Replace throttle position sensor. 
   • OK: Go to next step. 
3. Check for open and short in harness and connectors between ECM and throttle position sensor. 

   PREPARATION: 

   1. Disconnect the ECM connector.

   CHECK: 

   1. Measure the resistance between terminals VC and E2 of ECM connector.
   2. Measure the resistance between terminals VTA and E2 of ECM connector.

   OK: 

   TESTER CONNECTIONS AND SPECIFIED CONDITIONS TABLE
   
   

   Tester Connections	Throttle Valve	Specified Conditions
   VC (E4-2) - E2 (E4-18)	-	2.5 to 5.9 kΩ
   VTA (E4-23) - E2 (E4-18)	Fully closed	0.2 to 5.7 kΩ
   	Fully open	2.0 to 10.2 kΩ

   CHECK: 

   Measure the resistance between the terminals of VC and VTA of ECM connector and body ground.

   OK: Resistance: 10 kΩ or higher 

   Fig 3: Checking For Open And Short In Harness And Connectors Between ECM And Throttle Position Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG: Repair or replace harness or connector. 
   • OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
4. Inspect throttle position sensor. 

   PREPARATION: 

   Disconnect the throttle position sensor connector.

   CHECK: 

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

   OK: 

   TESTER CONNECTIONS AND SPECIFIED CONDITIONS TABLE
   
   

   Tester Connections	Throttle Valve	Specified Conditions
   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
   	Fully open	2.0 to 10.2 kΩ

   Fig 4: Inspecting Throttle Position Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG: Replace throttle position sensor. 
   • OK: Go to next step. 
5. Check for open and short in harness and connectors between ECM and throttle position sensor (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   • NG: Repair or replace harness or connector. 
   • OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 

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

1. Inspect throttle position sensor. 

   PREPARATION: 

   Disconnect the throttle position sensor connector.

   CHECK: 

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

   OK: 

   TESTER CONNECTIONS AND SPECIFIED CONDITIONS TABLE
   
   

   Tester Connections	Throttle Valve	Specified Conditions
   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
   	Fully open	2.0 to 10.2 kΩ

   Fig 5: Inspecting Throttle Position Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG: Replace throttle position sensor. 
   • OK: Go to next step. 
2. Check for open and short in harness and connectors between ECM and throttle position sensor (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   • NG: Repair or replace harness or connector. 
   • OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ).