Inspection Procedure

HINT:

• If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have open circuit.
• 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, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a 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 the DLC3.
   2. Turn the ignition switch ON.
   3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS.
   Fig 1: Identifying Accelerator Pedal Positions

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   CHECK: 

   Read its value displayed on the hand-held tester.

   RESULT: 

   ACCELERATOR PEDAL POSITION RESULTS
   
   

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

   1. B : Check for intermittent problems (See  PRE-CHECK  ). 
   2. C Go to step   4 . 
   3. A : Go To Next Step 
2. Inspect throttle position sensor. 
   1. Disconnect the throttle position sensor connector.
   2. Measure the resistance between the terminals of the throttle position sensor.

   OK: 

   THROTTLE POSITION SENSOR RESISTANCE
   
   

   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

   Fig 2: Identifying Throttle Position Sensor Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG : Replace throttle position sensor. 
   2. OK : Go To Next Step 
3. Check for open and short in harness and connector between ECM and throttle position sensor. 

   PREPARATION: 

   1. Reconnect the throttle position sensor connector.
   2. 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: 

   THROTTLE POSITION SENSOR (AT ECM) RESISTANCE
   
   

   Tester Connection	Throttle Valve	Specified Condition
   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
   VTA (E4-23) E2 (E4-18)	Fully open	2.0 to 10.2 kΩ

   Fig 3: Identifying ECM Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   CHECK: 

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

   OK: 

   1. Resistance: 10 kΩ or higher 
   1. NG : Repair or replace harness or connector. 
   2. OK : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
4. Inspect throttle position sensor. 
   1. Disconnect the throttle position sensor connector.
   2. Measure the resistance between the terminals of the throttle position sensor.

   OK: 

   THROTTLE POSITION SENSOR RESISTANCE
   
   

   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

   Fig 4: Identifying Throttle Position Sensor Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG : Replace throttle position sensor. 
   2. OK : Go To Next Step 
5. Check for open and short in harness and connector between ECM and throttle position sensor (See  PROCEDURE  ). 
   1. NG : Repair or replace harness and connector. 
   2. OK : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 

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

1. Inspect throttle position sensor. 
   1. Disconnect the throttle position sensor connector.
   2. Measure the resistance between the terminals of the throttle position sensor.

   OK: 

   THROTTLE POSITION SENSOR RESISTANCE
   
   

   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

   Fig 5: Identifying Throttle Position Sensor Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG : Replace throttle position sensor. 
   2. OK : Go To Next Step 
2. Check for open and short in harness and connector between ECM and throttle position sensor (See  PROCEDURE  ). 
   1. NG : Repair or replace harness and connector. 
   2. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM)  ).