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DTC P1121 & P1122: Throttle Position (TP) Sensor

NOTE: DTC P1121 indicates a throttle position lower than expected. DTC P1122 indicates a throttle position higher than expected.
  1. If DTC P1121 is indicated, turn ignition on. Using scan tool, check throttle position. See THROTTLE POSITION PERCENTAGE  . With throttle valve fully open, if TP percentage is specified percentage or more, problem is intermittent, system is functioning properly at this time. If TP percentage is less than specified, replace TP sensor.
  2. If DTC P1122 is indicated, turn ignition on. Using scan tool, check throttle position. See THROTTLE POSITION PERCENTAGE  . With throttle valve fully closed, if TP percentage is specified percentage or less, problem is intermittent, system is functioning properly at this time. If TP percentage is more than specified, replace TP sensor.
    THROTTLE POSITION PERCENTAGE

    Application (1) Percent Open (2) Percent Closed
    A/T 13.7 17.3
    M/T 14.5 18.9
    (1) DTC P1121.
    (2) DTC P1122.
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