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Full Throttle Enrichment

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1987 Volkswagen Scirocco, 1987 Volkswagen Quantum, 1987 Volkswagen Jetta, 1987 Volkswagen Golf, and 1987 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.
  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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