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Starting Enrichment - 5-Cylinder Models

  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 (VW 1490) into harness connector of temperature sensor. Activate starter for 3 seconds.
  2. Current reading should be more than 70 mA for first 1.5 seconds of starter operation. If not, check for open circuit between terminal 24 on ECU connector and terminal 15a on starter. If starter circuit is good, check between terminals 2 and 21 on ECU connector. If wiring is good, replace ECU.
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