Main Relay
This 4-terminal relay is used for A/C, Fuel Pump and PCM power control. Test for continuity between terminal No.2 and No. 4, continuity should not exist. See Fig 1 . Apply battery voltage to terminal No. 1 and ground terminal No. 3. Continuity should exist between terminals No. 2 and No. 4. If not as specified, replace relay.