Battery Current Sensor

Reconnect harness connectors disconnected.
Disconnect battery negative cable (1).
Install jumper cable (A) between battery negative terminal and body ground.
Turn ignition switch ON.

Fig 1: Identifying Battery Negative Cable And Jumper Cable
Courtesy of NISSAN MOTOR CO., U.S.A.
Check voltage between ECM terminal 71 (battery current sensor signal) and ground.
Voltage: Approximately 2.5V
If NG, replace battery negative cable assembly.

Fig 2: Checking Voltage Between ECM Terminal 71 (Battery Current Sensor Signal) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.