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EFI Main Relay

NOTE: The EFI main relay may be referred to as the main relay.
  1. The EFI main relay is mounted on the ECM, located under left side of instrument panel, near kick panel. See Fig 1 . Disconnect electrical connector from EFI main relay.
  2. Using ohmmeter, ensure continuity exists between Black/White wire and Blue wire terminals of EFI main relay. Apply battery voltage to Black/White wire terminal and ground Blue wire terminal. Continuity should exist between Black/Red and Blue/Black wire terminals. Replace EFI main relay if continuity is not as specified.
Fig 1: Identifying EFI Main Relay
G91G17059Courtesy of GENERAL MOTORS CORP.