Power Circuits

WARNING: This page is about a different car, the 1997 Infiniti I30. However, it is still accessible from the selected car via links, so may be relevant.

Turn ignition switch to ON position. Using a voltmeter, check for battery voltage between chassis ground and ECM terminals No. 24, 67 and 72. See Fig 1 . If battery voltage is not present, check fusible link and fuse "G".
Turn ignition switch to OFF position. Using a voltmeter, check for battery voltage between chassis ground and ECM power back-up terminal No. 80. If battery voltage is not present, check for overheated relays, fusible links and wiring.

Fig 1: Identifying ECM Harness Connector Pin Terminals

Courtesy of NISSAN MOTOR CO., U.S.A.