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

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

   Result

   Display (DTC Output)	Proceed to
   P2121 is output	A
   P2121 and other DTCs are output	B

   HINT: 

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

B → GO TO DTC CHART 

A: Go to next step 

1. Connect the Techstream to the DLC3.
   Fig 1: Identifying Accelerator Pedal Operations

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2. Turn the ignition switch on (IG) and turn the tester on.
3. Select the following menu items: 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

   Accelerator Pedal Operation	Accel Sensor Out No. 1	Accel Sensor Out No. 2	Difference between Accel Sensor Out No. 1 and Accel Sensor Out No. 2
   Released	0.5 to 1.1 V	1.2 to 2.0 V	0.4 to 1.2 V
   Depressed	2.6 to 4.5 V	3.4 to 5.0 V

NG → See step   3 

OK → CHECK FOR INTERMITTENT PROBLEMS 

1. Replace accelerator pedal position sensor assembly, refer to COMPONENTS .

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the tester on.
3. Clear the DTCs, refer to DTC CHECK / CLEAR .
4. Start the engine.
5. Allow the engine to idle for 15 seconds.
6. Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
7. Read the DTCs.

   Result

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

B → END 

A → See step   5