Power Circuits

Turn ignition switch to ON position. Using a voltmeter, check for battery voltage between chassis ground and ECM terminals as follows:
- Terminals No. 38, 56 and 61. 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. 70. If battery voltage is not present, check for overheated relays, fusible links and wiring.

Fig 1: ECM Connector Terminals

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