Inspection Procedure

HINT:

• This DTC relates to the Accelerator Pedal Position (APP) sensor.
• Read freeze frame data using the Techstream. 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. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121) 
   1. Connect the Techstream to the DLC3.
   2. Turn the engine switch on (IG).
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   5. Read DTCs.

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      P2121 is output	A
      P2121 arid other DTCs are output	B

      HINT:

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

   B: GO TO DTC CHART  (See DIAGNOSTIC TROUBLE CODE CHART )

   A: Go to next step. 

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

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION
      
      

      Accelerator Pedal Operations	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 4.7 V

      Fig 1: Depressing And Releasing Accelerator Pedal Position

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step 3 

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

3. REPLACE ACCELERATOR PEDAL 
   1. Replace the accelerator pedal assembly (See REMOVAL ).
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P2121) 
   1. Connect the Techstream to the DLC3.
   2. Turn the engine switch on (IG) and turn the Techstream on.
   3. Clear 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 and ECT / Trouble Codes.
   7. Read DTCs.

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      P2121 is output	A
      No DTC is output	B

   B: SYSTEM OK 

   A: REPLACE ECM  (See ECM )