Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester. Freeze frame data records 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.

1. READ VALUE USING HAND-HELD TESTER (ACCEL POS #1 AND ACCEL POS #2) 
   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ACCEL POS #1 and ACCEL POS #2.
   4. Read the values displayed on the tester.

      Standard: 

      ACCELERATOR PEDAL SPECIFICATION
      
      

      Accelerator Pedal Operations	ACCEL POS #1 (AP#1)	ACCEL POS #2 (AP#2)
      Released	0.5 to 1.1 V	1.2 to 2.0 V
      Depressed	2.6 to 4.5 V	3.4 to 5.0 V

      Fig 1: Identifying Pedal Depressed Position

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK: Go to step   4 . 
   2. NG: Go to Next Step. 
2. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) 
   1. Disconnect the A19 Accelerator Pedal Position (APP) sensor connector.
   2. Disconnect the A24 ECM connector.
   3. Measure the resistance.
      Fig 2: Identifying Accelerator Pedal Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for open): 

      TYPICAL MALFUNCTION THRESHOLDS
      
      

      Tester Connections	Specified Conditions
      VPA (A19-6) - VPA (A24-18)	Below 1 Ω
      EPA (A19-5) - EPA (A24-20)	Below 1 Ω
      VCPA (A19-4) - VCPA (A24-26)	Below 1 Ω
      VPA2 (A19-3) - VPA2 (A24-19)	Below 1 Ω
      EPA2 (A19-2) - EPA2 (A24-21)	Below 1 Ω
      VCP2 (A19-1) - VCP2 (A24-27)	Below 1 Ω

      Standard (Check for short): 

      TYPICAL MALFUNCTION THRESHOLDS
      
      

      Tester Connections	Specified Conditions
      VPA (A19-6) or VPA (A24-18) - Body ground	10 kΩ or higher
      EPA (A19-5) or EPA (A24-20) - Body ground	10 kΩ or higher
      VCPA (A19-4) or VCPA (A24-26) - Body ground	10 kΩ or higher
      VPA2 (A19-3) or VPA2 (A24-19) - Body ground	10 kΩ or higher
      EPA2 (A19-2) or EPA2 (A24-21) - Body ground	10 kΩ or higher
      VCP2 (A19-1) or VCP2 (A24-27) - Body ground	10 kΩ or higher

   4. Reconnect the APP sensor connector.
   5. Reconnect the ECM connector.
      Fig 3: Connecting A19 Accelerator Pedal Position (APP) Sensor Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
   2. OK: Go to Next Step. 
3. REPLACE ACCELERATOR PEDAL (SEE  REPLACEMENT  ) 
   1. NEXT: Go to Next Step. 
4. CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS) 
   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch on (IG) and turn the tester on.
   3. Clear DTCs (see DTC CHECK/CLEAR  ).
   4. Start the engine.
   5. Allow the engine to idle for 15 seconds.
   6. Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
   7. Read DTCs.

      Result: 

      DTC OUTPUT
      
      

      Display (DTC Output)	Proceed To
      P2121	A
      No output	B

   1. B: SYSTEM OK 
   2. A: REPLACE ECM (SEE  REPLACEMENT  )