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Main Relay: Discovery

  1. Main relay may also be called the Multiport Fuel Injection Load relay. Main relay is an integral component of the multifunction relay unit, which is located in right rear of engine compartment. Disconnect connectors at multifunction relay unit. Check continuity with ohmmeter positive probe connected to multifunction relay unit 9-pin Black connector C1029 terminal No. 6 and negative probe connected to multifunction relay unit 6-pin Black connector C1030 terminal No. 3. See Figure and Figure . Continuity should exist. If continuity is as specified, go to next step. If continuity is not as specified, replace multifunction relay unit.
  2. Reverse polarity of the ohmmeter. Continuity should not exist. If continuity is as specified, go to next step. If continuity is not as specified, replace multifunction relay unit.
  3. Check continuity between multifunction relay unit 9-pin Black connector C1029 terminals No. 6 and 8, and between terminals No. 6 and 3. Continuity should not exist. If continuity is as specified, go to next step. If continuity is not as specified, replace multifunction relay unit.
  4. Apply battery voltage to multifunction relay unit 9-pin Black connector C1029 terminal No. 6 and ground multifunction relay unit 6-pin Black connector C1030 terminal No. 3. Check continuity between multifunction relay unit 9-pin Black connector C1029 terminals No. 6 and 8, and between terminal No. 6 and 3. Continuity should exist. If continuity is as specified, fuel pump relay is okay. If continuity is not as specified, replace multifunction relay unit.
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