Inspection Procedure

HINT:

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

1. Are there any other codes (besides DTC P0121) being output? 

   PREPARATION: 

   1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
   2. Turn the ignition switch to ON and turn the hand-held tester or the OBD II scan tool ON.
   3. On the hand-held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

   CHECK: 

   Read DTCs using the hand-held tester or the OBD II scan tool.

   RESULT: 

   DTC P0121 OUTPUT RESULT TABLE
   
   

   Display (DTC output)	Proceed To
   P0121 and other DTCs	A
   P0121	B

   HINT:

   If any other codes besides P0121 are output, perform the troubleshooting for those DTCs first.

   • B: Replace throttle position sensor. 
   • A: Go to DTC chart (See  DIAGNOSTIC TROUBLE CODE CHART   ).