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Lambda Control

  1. Connect test harness between differential pressure regulator and vehicle harness. Connect multimeter to test harness. Disconnect wiring from coolant temperature sensor. Plug jumper end of test resistor into harness connector of temperature sensor. Unplug oxygen sensor. Turn ignition on.
  2. Differential pressure regulator current should be 9-11 mA. Ground Green wire of oxygen sensor. Differential pressure regulator current should increase to 19-22 mA. If not, check wiring from terminal No. 8 of ECU connector to oxygen sensor. If wiring is correct, replace ECU.
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