Warm-Up Enrichment

Connect test harness between differential pressure regulator and vehicle harness. See Fig 1 . Connect multimeter to test harness. Disconnect wiring from coolant temperature sensor and leave open. Turn ignition on. Differential pressure regulator current should be 80-110 mA. If not, replace ECU.

Fig 1: Connecting Multimeter to Differential Pressure Regulator This shows connections for all enrichment tests.