Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester. 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, and other data from the time the malfunction occurred.

1. READ VALUE OF HAND-HELD TESTER (ACCEL POS #1 AND ACCEL POS #2) 
   1. Turn the ignition switch to ON.
   2. On the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL POS #2.
   3. Read the values.

      Standard: 

      ACCEL POS #1 AND ACCEL POS #2
      
      

      Accelerator Pedal	ACCEL POS #1	ACCEL POS #2
      Released	0.5 to 1.1 V	1.5 to 2.9 V
      Depressed	2.5 to 4.6 V	3.5 to 5.5 V

   Fig 1: Identifying Accelerator Pedal Depressed And Released Position

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPLACE ECM (See  REPLACEMENT  ) 

   NG: Go to next step 

2. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) 
   1. Disconnect the A20 accelerator pedal position sensor connector.
   2. Disconnect the E9 ECM connector.
   3. Check the resistance between the wire harness side connectors.
      Fig 2: Identifying Accelerator Pedal Position Sensor Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for open): 

      ACCELERATOR PEDAL POSITION SENSOR - ECM (CHECK FOR OPEN)
      
      

      Tester Connection	Specified Condition
      VPA1 (A20-6) - VPA (E9-18)	Below 1 Ω
      EP1 (A20-5) - EPA (E9-20)	Below 1 Ω
      VCP1 (A20-4) - VCPA (E9-26)	Below 1 Ω
      VPA2 (A20-3) - VPA2 (E9-19)	Below 1 Ω
      EP2 (A20-2) - EPA2 (E9-21)	Below 1 Ω
      VCP2 (A20-1) - VCP2 (E9-27)	Below 1 Ω

      Standard (Check for short): 

      ACCELERATOR PEDAL POSITION SENSOR - ECM (CHECK FOR SHORT)
      
      

      Tester Connection	Specified Condition
      VPA1 (A20-6) or VPA (E9-18) - Body ground	10 kΩ or higher
      EP1 (A20-5) or EPA (E9-20) - Body ground	10 kΩ or higher
      VCP1 (A20-4) or VCPA (E9-26) - Body ground	10 kΩ or higher
      VPA2 (A20-3) or VPA2 (E9-19) - Body ground	10 kΩ or higher
      EP2 (A20-2) or EPA2 (E9-21) - Body ground	10 kΩ or higher
      VCP2 (A20-1) or VCP2 (E9-27) - Body ground	10 kΩ or higher

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

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Reconnect the accelerator pedal position sensor connector.
   5. Reconnect the ECM connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ACCELERATOR PEDAL ROD ASSY (See  ACCELERATOR PEDAL ROD ASSY (2UZ-FE)  )