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TPS Inspection

  1. Disconnect TPS connector. Move throttle lever to idle position by using hand vacuum pump and applying 15 in. Hg vacuum to throttle opener. Using ohmmeter, check continuity between upper and lower terminals of TPS connector with proper shim thickness gauge inserted between throttle valve lever and stop screw. See Figure . See THROTTLE POSITION SENSOR (TPS) RESISTANCE  table.
    THROTTLE POSITION SENSOR (TPS) RESISTANCE

    Application Ohms
    Between Terminals "C" & "D"
    With .008" (.20 mm) Clearance At Stop Screw 0-550
    With .016" (.41 mm) Clearance At Stop Screw Infinity
    Between Terminals "A" & "D" 3500-6500
    Between Terminals "B" & "D"
    At Idle (1) 0-2000
    At Wide Open Throttle (2) 2000-6500
    (1) To obtain idle position, use hand vacuum pump to apply 19 in. Hg of vacuum to throttle opener.
    (2) There should be more than 2000 ohms difference between idle and wide open throttle readings.
  2. If TPS inspection results between terminals "C" and "D" are not within table specifications, adjust TPS. If any of TPS inspection results between terminals "C" and "D", "A" and "D" and "B" and "D" cannot be adjusted to be within specifications, replace TPS.
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