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Full Throttle Enrichment

  1. Connect test harness to DPR and vehicle harness. See Figure . Disconnect wiring from coolant temperature sensor. Plug "jumper end" of Test Resistor (VW 1490) into harness connector of temperature sensor. Unplug oxygen sensor. Turn ignition on. On Golf GTI and Jetta GLI start engine and increase speed to 3000 RPM.
  2. Activate full throttle switch. Current reading should increase 16 mA on Golf GTI and Jetta GLI models (3 mA on all other models) when switch is activated. If not, check full throttle switch. See ADJUSTMENTS  .
  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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