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Full Throttle Enrichment

  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. Activate full throttle switch. Current reading should increase 3 mA when switch is activated. If not, check full throttle switch. See ADJUSTMENTS  in this article.
  3. If switch is functioning and adjusted correctly, check for open circuit between terminals No. 5 and 2 on ECU connector and terminals on full throttle switch. If wiring is good, replace ECU.
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