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Home >> Scion >> 2004 >> xA Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnosis >> DTC P0121: Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance Problem >> Inspection Procedure

Inspection Procedure

NOTE: Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
  1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0121) 
    1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
    2. Turn the ignition switch ON and push the hand-held tester or the OBD II scan toolmain switch ON.
    3. Select the item "DIAGNOSIS / OBD/MOBD / DTC INFO / CURRENT CODES".
    4. Read the DTCs using the hand-held tester or the OBD II scan tool.

      Result: 

      INSPECTION PROCEDURE

      Display (DTC output) Proceed to
      "P0121" And Other DTCs Are Output A
      Only "P0121" is output B
      NOTE: If any other codes besides P0121 is output, perform the troubleshooting for those DTCs first.
    1. B : REPLACE E.F.I. THROTTLE POSITION SENSOR 
    2. A : GO TO RELEVANT DTC CHART (See  DIAGNOSTIC TROUBLE CODE CHART  ) 
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