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

1. Connect the Techstream to the DLC3.
   Fig 1: Checking Brake Pedal Depressed & Released

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Enter the following menus: Powertrain / Engine / Data List / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.
4. Read the values displayed on the Techstream.

   Standard voltage

   Accelerator Pedal Condition	Accel Sensor Out No. 1	Accel Sensor Out 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

OK → See step   3 

NG: Go to next step 

1. Disconnect the A2 Accelerator Pedal Position (APP) sensor connector.
   Fig 2: Checking Harness And Connector (Accelerator Pedal Position Sensor - ECM)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A10 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Specified Condition
   VPA (A2-6) - VPA (A10-55)	Below 1 Ω
   EPA (A2-5) - EPA (A10-59)	Below 1 Ω
   VCPA (A2-4) - VCPA (A10-57)	Below 1 Ω
   VPA2 (A2-3) - VPA2 (A10-56)	Below 1 Ω
   EPA2 (A2-2) - EPA2 (A10-60)	Below 1 Ω
   VCP2 (A2-1) - VCP2 (A10-58)	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Specified Condition
   VPA (A2-6) or VPA (A10-55) - body ground	10 kΩ or higher
   EPA (A2-5) or EPA (A10-59) - body ground	10 kΩ or higher
   VCPA (A2-4) or VCPA (A10-57) - body ground	10 kΩ or higher
   VPA2 (A2-3) or VPA2 (A10-56) - body ground	10 kΩ or higher
   EPA2 (A2-2) or EPA2 (A10-60) - body ground	10 kΩ or higher
   VCP2 (A2-1) or VCP2 (A10-58) - body ground	10 kΩ or higher

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs. Refer to DTC CHECK / CLEAR .
4. Start the engine.
5. Allow the engine to idle for 15 seconds.
6. Enter the following menus: Powertrain / Engine / Trouble Code.
7. Read the DTCs.

   Result

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

B → END 

A → See step   5