DTC P0171 Fuel Injection System Function: Wiring Diagram

For PG, go to POWER SUPPLY, GROUND & CIRCUIT ELEMENTS .

Fig 1: Wiring Diagram - EC-FUEL-01

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

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

Pulse signal is measured by CONSULT-III.

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.

TERMINAL ITEM CONDITION CHART

TERMINAL NO.	WIRE COLOR	ITEM	CONDITION	DATA (DC Voltage)
3	BR/W	A/F sensor 1 heater	[Engine is running] Warm-up condition Idle speed (More than 140 seconds after starting engine)	Courtesy of NISSAN MOTOR CO., U.S.A.
25 29 30 31	R O GR L	Fuel injector No. 4 Fuel injector No. 3 Fuel injector No. 2 Fuel injector No. 1	[Engine is running] Warm-up condition Idle speed NOTE: The pulse cycle changes depending on RPM at idle	Courtesy of NISSAN MOTOR CO., U.S.A.
25 29 30 31	R O GR L		[Engine is running] Warm-up condition Engine speed: 2, 000 RPM	Courtesy of NISSAN MOTOR CO., U.S.A.
49	L/R	A/F sensor 1	[Engine is running] Warm-up condition Engine speed: 2, 000 RPM	Approximately 1.8V Output voltage varies with air fuel ratio.
53	L/G	A/F sensor 1	[Ignition switch: ON]	Approximately 2.2V
* : Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)