Nissan Sentra manuals

Nissan Sentra Service Manual: Fuel injector

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / Fuel injector

Component Function Check

1.INSPECTION START

Turn ignition switch to START.

Is any cylinder ignited? YES >> GO TO 2.

NO >> Proceed to EC-450, "Diagnosis Procedure".

2.CHECK FUEL INJECTOR FUNCTION

With CONSULT


  1. Start engine.
  2. Perform “POWER BALANCE” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
  3. Check that each circuit produces a momentary engine speed drop

Without CONSULT


  1. Let engine idle.
  2. Listen to each fuel injector operating sound.

Clicking noise should be heard.

Is the inspection result normal?


Is the inspection result normal? YES >> INSPECTION END

NO >> Proceed to EC-450, "Diagnosis Procedure".

Diagnosis Procedure

1.CHECK FUSE

  1. Turn ignition switch OFF.
  2. Pull out #52 fuse and check that the fuse is not fusing.

Is the inspection result normal? YES >> GO TO 2.

NO >> Replace the fuse after repairing the applicable circuit.

2.CHECK FUEL INJECTOR POWER SUPPLY

  1. Insert the fuse which pulled out.
  2. Disconnect fuel injector harness connector.
  3. Turn ignition switch ON.
  4. Check the voltage between fuel injector harness connector and ground.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 4.

NO >> GO TO 3.

3.CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect IPDM E/R harness connector.
  3. Check the continuity between fuel injector harness connector and IPDM E/R harness connector


  1. Also check harness for short to ground.

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Repair or replace error-detected parts.

4.CHECK FUEL INJECTOR CONTROL CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between fuel injector harness connector and ECM harness connector.


  1. Also check harness for short to ground and to power.

Is the inspection result normal? YES >> GO TO 5.

NO >> Repair or replace error-detected parts

5.CHECK FUEL INJECTOR

Check the fuel injector. Refer to EC-451, "Component Inspection (Fuel Injector)".

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident" NO >> Replace malfunctioning fuel injector. Refer to EM-40, "Removal and Installation".

Component Inspection (Fuel Injector)

1.CHECK FUEL INJECTOR

  1. Turn ignition switch OFF.
  2. Disconnect fuel injector harness connector.
  3. Check resistance between fuel injector terminals as per the following.

Is the inspection result normal?


Is the inspection result normal? YES >> INSPECTION END

NO >> Replace malfunctioning fuel injector. Refer to EM-40, "Removal and Installation"

ASCD Indicator
Component Function Check 1.CHECK ASCD INDICATOR FUNCTION Check ASCD indicator under the following conditions. ASCD INDICATOR CONDITION SPECIFICATION CRUISE LAMP Ig ...

Fuel pump
Component Function Check 1.CHECK FUEL PUMP FUNCTION Turn ignition switch ON. Pinch fuel feed hose with two fingers. Fuel pressure pulsation should be felt on the fuel feed hose for ...

Other materials:

U1000 Can comm circuit
Description CAN (Controller Area Network) is a serial communication line for real-time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent malfunction detection ability. Many electronic control units are equipped onto a vehicle, an ...

Moonroof unit assembly
Inspection WIND DEFLECTOR Open glass lid fully Visually check for proper installation, damaged/deteriorated components, or foreign objects within mechanism. Correct as required for smooth operation. Check for grease at the wind deflector arm (1) and pivot areas. If necessary, apply ...

B1429 Seat belt buckle switch RH
Description DTC B1429 SEAT BELT BUCKLE SWITCH RH The air bag diagnosis sensor unit monitors the seat belt buckle switch RH status. If the control unit detects an open or short condition in the circuit, it will set the DTC. PART LOCATION Refer to SRC-5, "Component Parts Location". D ...

© 2014-2024 Copyright www.nisentra.com