DTC P2121 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance: Wiring Diagram

Refer to DTC P2120  .

HINT:

• Read freeze frame data using the intelligent tester. 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 FREEZE FRAME DATA  ).
• This DTC relates to the Accelerator Pedal Position (APP) sensor.

1. READ VALUE OF INTELLIGENT TESTER (ACCEL POS #1 AND ACCEL POS #2) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the engine switch on (IG) and turn the tester on.
   3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ACCEL POS #1 and ACCEL POS #2.
   4. Read the values displayed on the tester.

      Standard voltage 

      VOLTAGE 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: Depressing And Releasing Accelerator Pedal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : Go to step   3 

   NG : GO TO NEXT STEP 

2. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) 
   1. Disconnect the A26 Accelerator Pedal Position (APP) sensor connector.
   2. Disconnect the A6 ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open) 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      VPA (A26-6) - VPA (A6-33)	Below 1 Ω
      EPA (A26-5) - EPA (A6-34)	Below 1 Ω
      VCPA (A26-4) - VCPA (A6-35)	Below 1 Ω
      VPA2 (A26-3) - VPA2 (A6-32)	Below 1 Ω
      EPA2 (A26-2) - EPA2 (A6-26)	Below 1 Ω
      VCP2 (A26-1) - VCP2 (A6-27)	Below 1 Ω

      Standard resistance (Check for short) 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      VPA (A26-6) or VPA (A6-33) - body ground	10 kΩ or higher
      EPA (A26-5) or EPA (A6-34) - body ground	10 kΩ or higher
      VCPA (A26-4) or VCPA (A6-35) - body ground	10 kΩ or higher
      VPA2 (A26-3) or VPA2 (A6-32) - body ground	10 kΩ or higher
      EPA2 (A26-2) or EPA2 (A6-26) - body ground	10 kΩ or higher
      VCP2 (A26-1) or VCP2 (A6-27) - body ground	10 kΩ or higher

      Fig 2: Identifying A6 ECM Connector

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

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : GO TO NEXT STEP 

3. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY 

   NEXT 

4. CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the engine switch on (IG) and turn the tester on.
   3. Clear DTCs (See DIAGNOSIS SYSTEM  ).
   4. Start the engine.
   5. Allow the engine to idle for 15 seconds.
   6. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
   7. Read DTCs.

      Result 

      RESULT REFERENCE
      
      

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

   B : SYSTEM IS OK 

   A : REPLACE ECM