ECU Relay Continuity Test

Turn ignition off. Using an ohmmeter, check for continuity between ECU connector terminals No. 1 and 3, and between terminals No. 1 and 20. See Figure . If there is continuity at both test points, go to next test. If there is no continuity at either or both test points, check wiring. If wiring is faulty, repair and retest. If wiring is okay, replace relay and retest.