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Corolla RWD, MR2, Pickup & 4Runner

  1. Unplug connector from sending unit. Connect positive lead from a voltmeter to terminal and negative lead to ground. Turn ignition on. Meter should vibrate near 4.5 volt position.
  2. If reading is incorrect, test gauge resistance. See Figure-Figure . Resistance between oil pressure gauge terminals should be about 42-44 ohms. If not, replace oil pressure gauge.
  3. To test sending unit, unplug connector from sending unit. Connect 12-volt source to sending unit in series with a 3.4-watt bulb. Bulb should not light with engine stopped. With engine running, bulb should flash. Flashes will vary with engine speed.
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