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

1. Connect the Techstream to the DLC3.
   Fig 1: Identifying Accelerator Pedal Depressed And Released Position

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON 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 tester.

   Standard voltage

   Accelerator Pedal Operations	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 4.7 V

   Result

   Result	Proceed to
   NG	A
   OK	B

B → See step   3 

A: Go to next step 

1. Disconnect the Accelerator Pedal Position (APP) sensor connector.
   Fig 2: Identifying A17 And A55 Connectors Terminals

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

   Standard resistance (Check for open)

   Tester Connection	Condition	Specified Condition
   A17-6 (VPA) - A55-55 (VPA)	Always	Below 1 Ω
   A17-5 (EPA) - A55-59 (EPA)	Always	Below 1 Ω
   A17-4 (VCPA) - A55-57 (VCPA )	Always	Below 1 Ω
   A17-3 (VPA2) - A55-56 (VPA2)	Always	Below 1 Ω
   A17-2 (EPA2) - A55-60 (EPA2)	Always	Below 1 Ω
   A17-1 (VCP2) - A55-58 (VCP2)	Always	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Condition	Specified Condition
   A17-6 (VPA) or A55-55 (VPA) - body ground	Always	10 kΩ or higher
   A17-5 (EPA) or A55-59 (EPA) - body ground	Always	10 kΩ or higher
   A17-4 (VCPA) or A55-57 (VCPA) - body ground	Always	10 kΩ or higher
   A17-3 (VPA2) or A55-56 (VPA2) - body ground	Always	10 kΩ or higher
   A17-2 (EPA2) or A55-60 (EPA2) - body ground	Always	10 kΩ or higher
   A17-1 (VCP2) or A55-58 (VCP2) - body ground	Always	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 

1. Replace the accelerator pedal rod assembly. Refer to REMOVAL .

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON 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