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 FREEZE FRAME DATA ).
• This DTC relates to the Accelerator Pedal Position (APP) sensor.

1. READ VALUE OF TECHSTREAM (ACCEL POS #1 AND ACCEL POS #2) 
   1. Connect Techstream to the DLC3.
   2. Turn the engine switch on (IG) and turn the tester on.
   3. Enter the following menus: Powertrain / Engine and ECT / Data List / Accelerator Position No. 1 and Accelerator Position No. 2.
   4. Read the values displayed on the tester.

   Standard voltage 

   VOLTAGE SPECIFICATION CHART
   
   

   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: Inspecting Accelerator Pedal Position

   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 CHART
      
      

      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 CHART
      
      

      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

   4. Reconnect the APP sensor connector.
   5. Reconnect the ECM connector.
   Fig 2: Identifying A26 Accelerator Pedal Position (APP) Sensor Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

3. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY 
4. CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS) 
   1. Connect Techstream to the DLC3.
   2. Turn the engine 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. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   7. Read DTCs.

   Result 

   RESULT CHART
   
   

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

   B: END 

   A: REPLACE ECM