Power Supply And Ground Circuit: Wiring Diagram

Fig 1: Identifying Wiring Diagram (EC-MAIN-01)

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

Specification data are reference values and are measured between each terminal and ground.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

WIRE COLOR AND TERMINAL NO. DESCRIPTION

TERMINAL NO.	WIRE COLOR	ITEM	CONDITION	DATA (DC Voltage)
1	B	ECM ground	[Engine is running] Idle speed	Body ground
109	B/R	Ignition switch	[Ignition switch: OFF]	0V
109	B/R	Ignition switch	[Ignition switch: ON]	BATTERY VOLTAGE (11 - 14V)
111	W/G	ECM relay (Self shut-off)	[Engine is running] [Ignition switch: OFF] For a few seconds after turning ignition switch OFF	0-1.0V
111	W/G	ECM relay (Self shut-off)	[Ignition switch: OFF] More than a few seconds after turning ignition switch OFF	BATTERY VOLTAGE (11 -14V)
115 116	B	ECM ground	[Engine is running] Idle speed	Body ground
119 120	R/G	Power supply for ECM	[Ignition switch: ON]	BATTERY VOLTAGE (11 - 14V)