1997 Lexus LS 400FACTORY OEM SERVICE PROCEDURE

Throttle Position (TP) Sensor

NOTE: Vehicles with Traction Control System (TRAC) are equipped with a main TP sensor and a sub-TP sensor. The following procedure applies to main TP sensor. For sub-TP sensor, see SUB-THROTTLE POSITION (SUB-TP) SENSOR.

Disconnect TP sensor connector. Measure resistance between specified terminals of TP sensor connector. See TP SENSOR RESISTANCE  table. See Figure. If resistance is not as specified, adjust TP sensor. See THROTTLE POSITION (TP) SENSOR in ADJUSTMENTS article. Recheck resistance. If resistance is still not as specified, replace TP sensor.

TP SENSOR RESISTANCE

Application & Throttle Plate Position (1) TP Sensor Terminals Ohm Readings
Throttle Fully Closed VTA1 & E2 340-6300
.016" (.40 mm) (2) IDL1 & E2 500 Or Less
*(3) IDL1 & E2 Infinite (Open)
Throttle Fully Open VTA1 & E2 2400-11,200
All Positions VC & E2 3100-7200
(1) Disconnect vacuum hose from throttle opener. Apply vacuum to throttle opener to allow throttle to fully seat.
(2) Insert feeler gauge between throttle lever and throttle stop screw.
(3) Insert a .026" (.65 mm) feeler gauge between throttle lever and throttle stop screw.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.