DTC P2121: Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance (TO 12/2010): Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Trouble Codes.
5. Read the DTCs.

   Result

   Result	Proceed to
   DTC P2121 is output	A
   DTC P2121 and other DTCs are output	B

   HINT: 

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

B → See step   6 

A: Go to next step 

1. Connect 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 / All Data / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.
4. Read the values displayed on the Techstream.

   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 5.0 V

OK → See step   7 

NG: Go to next step 

1. Disconnect the Accelerator Pedal Position (APP) sensor connector.
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
   A19-6 (VPA) - A55-55 (VPA)	Always	Below 1 Ω
   A19-5 (EPA) - A55-59 (EPA)	Always	Below 1 Ω
   A19-4 (VCPA) - A55-57 (VCPA)	Always	Below 1 Ω
   A19-3 (VPA2) - A55-56 (VPA2)	Always	Below 1 Ω
   A19-2 (EPA2) - A55-60 (EPA2)	Always	Below 1 Ω
   A19-1 (VCP2) - A55-58 (VCP2)	Always	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Condition	Specified Condition
   A19-6 (VPA) or A55-55 (VPA) - Body ground	Always	10 kΩ or higher
   A19-5 (EPA) or A55-59 (EPA) - Body ground	Always	10 kΩ or higher
   A19-4 (VCPA) or A55-57 (VCPA) - Body ground	Always	10 kΩ or higher
   A19-3 (VPA2) or A55-56 (VPA2) - Body ground	Always	10 kΩ or higher
   A19-2 (EPA2) or A55-60 (EPA2) - Body ground	Always	10 kΩ or higher
   A19-1 (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 assembly. Refer to REMOVAL .

NEXT: Go to next step 

1. Connect 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. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
6. Enter the following menus: Powertrain / Engine / Trouble Codes.
7. Read the DTCs.

   Result

   Result	Proceed to
   DTC P2121 is output	A
   DTC is not output	B

B → END 

A → See step   8