DTC P0171 Fuel Injection System Function: Wiring Diagram

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

Fig 1: EC-FUEL-01 - Wiring Diagram

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-II.

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.

ECM INSPECTION CHART

TERMINAL NO.

WIRE COLOR

ITEM

CONDITION

DATA (DC Voltage)

A/F sensor 1 heater

[Engine is running]

Warm-up condition
Idle speed
(More than 140 seconds after starting engine)

Approximately 2.9 - 8.8V⁽¹⁾

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

25
29
30
31

V
Y
O
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

BATTERY VOLTAGE (11 - 14V)⁽¹⁾

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

[Engine is running]

Warm-up condition
Engine speed: 2, 000 RPM

BATTERY VOLTAGE (11 - 14V)⁽¹⁾

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

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.

A/F sensor 1

[Ignition switch: ON]

Approximately 2.2V

⁽¹⁾	Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)