Inspection Procedure

HINT:

• Read freeze frame data using Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (See DTC CHECK/CLEAR  ).
• This DTC relates to the Accelerator Pedal Position (APP) sensor.

1. READ VALUE USING TECHSTREAM (ACCEL POS #1 AND ACCEL POS #2) 
   1. Connect Techstream to the DLC3.
   2. Turn the ignition switch to ON and turn the tester on.
   3. Enter the following menus: Powertrain/Engine/Data List/ETCS/Accel Sensor Out No. 1 and Accel Sensor Out No. 2.
   4. Read the values displayed on the tester.
      Fig 1: Depressing And Releasing Accelerator Pedal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      VOLTAGE SPECIFIED CONDITION
      
      

      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 4.7 V

      OK: Go to step  3

      NG: Go to next step 

2. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) 
   1. Disconnect the Accelerator Pedal Position (APP) sensor connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open) 

      RESISTANCE SPECIFIED CONDITIONS
      
      

      Tester Connection	Specified Condition
      VPA (A19-6) - VPA (A55-55)	Below 1 Ω
      EPA (A19-5) - EPA (A55-59)	Below 1 Ω
      VCPA (A19-4) - VCPA (A55-57)	Below 1 Ω
      VPA2 (A19-3) - VPA2 (A55-56)	Below 1 Ω
      EPA2 (A19-2) - EPA2 (A55-60)	Below 1 Ω
      VCP2 (A19-1) - VCP2 (A55-58)	Below 1 Ω

      Standard resistance (Check for short) 

      RESISTANCE SPECIFIED CONDITIONS
      
      

      Tester Connection	Specified Condition
      VPA (A19-6) or VPA (A55-55) - Body ground	10 kΩ or higher
      EPA (A19-5) or EPA (A55-59) - Body ground	10 kΩ or higher
      VCPA (A19-4) or VCPA (A55-57) - Body ground	10 kΩ or higher
      VPA2 (A19-3) or VPA2 (A55-56) - Body ground	10 kΩ or higher
      EPA2 (A19-2) or EPA2 (A55-60) - Body ground	10 kΩ or higher
      VCP2 (A19-1) or VCP2 (A55-58) - Body ground	10 kΩ or higher

   4. Reconnect the APP sensor connector.
   5. Reconnect the ECM connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 2: Identifying A19 APP Sensor And A55 ECM Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

3. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY 
   1. Replace the accelerator pedal rod assembly (See REMOVAL  ).
4. CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS) 
   1. Connect Techstream to the DLC3.
   2. Turn the ignition switch to ON and turn the tester on.
   3. Clear the DTCs (See DTC CHECK/CLEAR  ).
   4. Start the engine.
   5. Allow the engine to idle for 15 seconds.
   6. Enter the following menus: Powertrain/Engine/Trouble Codes.
   7. Read the DTCs.

      Result 

      DTC OUTPUT RESULT
      
      

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

      B: END 

      A: REPLACE ECM (See  REMOVAL   )