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Home >> Infiniti >> 1999 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> Engine Controls - On-Vehicle Adjustments >> Throttle Position (TP) Sensor >> TP Sensor Idle Position Adjustment
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TP Sensor Idle Position Adjustment

  1. Start engine and warm to normal operating temperature. Turn ignition off. On Q45, disconnect vacuum hose from throttle opener. Install a hand vacuum pump to throttle opener. Apply vacuum until throttle drum does not contact throttle opener. See Fig 1.
  2. On all models, disconnect closed throttle position switch harness connector. Check continuity between appropriate terminals with specified feeler gauge inserted between throttle adjusting screw and throttle drum. See FEELER GAUGE THICKNESS  table. See Fig 2, Fig 3 or Fig 4 .
  3. Ensure continuity is as specified with appropriate feeler gauge installed. If continuity is not as specified, open and close throttle 2-3 times and recheck continuity. If continuity is still not as specified, loosen TP sensor mounting screws, and rotate TP sensor body until continuity is as specified when each feeler gauge is inserted.
FEELER GAUGE THICKNESS

Application Continuity No Continuity
G20 .006" (.15 mm) .012" (.30 mm)
I30 .012" (.30 mm) .016" (.40 mm)
Q45 .008" (.20 mm) .012" (.30 mm)
Fig 1: Retracting Throttle Opener (Q45)
G99H08858Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Adjusting Throttle Position Sensor Idle Position (G20)
G99F08862Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 3: Adjusting Throttle Position Sensor Idle Position (I30)
G99D08856Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 4: Adjusting Throttle Position Sensor Idle Position (Q45)
G99B08860Courtesy of NISSAN MOTOR CO., U.S.A.
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