Inspection Procedure

HINT:

• This DTC relates to the Accelerator Pedal Position (APP) sensor.
• Read freeze frame data using the Techstream. 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.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain/Engine/Trouble Codes.
   5. Read DTCs.

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      P2121	A
      P2121 and other DTCs	B

      HINT:

      If any DTCs other than P2121 are output, troubleshoot those DTCs first.

      B:  GO TO DTC CHART 

      A: Go to Next Step 

2. READ VALUE USING TECHSTREAM (ACCELERATOR POSITION SENSOR) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain/Engine/Data List/ETCS/Accelerator Position No. 1 and Accelerator Position No. 2.
   5. Read the values displayed on the Techstream.

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION
      
      

      Accelerator Pedal Operation	Accelerator Position No. 1	Accelerator Position No. 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

      NG: Go to step 3 

      Fig 1: Identifying Accelerator Pedal Depressed And Released Position

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS  )

3. REPLACE ACCELERATOR PEDAL 
   1. Replace the accelerator pedal assembly (See ACCELERATOR PEDAL  ).
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P2121) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the Techstream on.
   4. Clear DTCs (See DTC CHECK/CLEAR  ).
   5. Start the engine.
   6. Allow the engine to idle for 15 seconds.
   7. Enter the following menus: Powertrain/Engine/Trouble Codes.
   8. Read DTCs.

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      P2121	A
      No output	B

      B: END 

      A: REPLACE ECM  (See ECM  )