Nissan Altima 2007-2012 Service Manual: Fuel injector
Description
The fuel injector is a small, precise solenoid valve. When the ECM supplies a ground to the fuel injector circuit, the coil in the fuel injector is energized. The energized coil pulls the ball valve back and allows fuel to flow through the fuel injector into the intake manifold.
The amount of fuel injected depends upon the injection pulse duration.
Pulse duration is the length of time the fuel injector remains open. The ECM controls the injection pulse duration based on engine fuel needs.
Component Function Check
1.INSPECTION START
Turn ignition switch to START.
Is any cylinder ignited? YES >> GO TO 2.
NO >> Go to EC-463, "Diagnosis Procedure".
2.CHECK FUEL INJECTOR FUNCTION
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
3. Make sure that each circuit produces a momentary engine speed drop.
1. Let engine idle.
2. Listen to each fuel injector operating sound.
Clicking noise should be heard.
Is the inspection result normal? YES >> INSPECTION END
NO >> Go to EC-463, "Diagnosis Procedure".
Diagnosis Procedure
1.CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
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? YES >> GO TO 3.
NO >> GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
• IPDM E/R harness connector F10
• 10A fuse (No. 35) • Harness for open or short between fuel injector and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between fuel injector harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal? YES >> GO TO 4.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK FUEL INJECTOR
Refer to EC-464, "Component Inspection".
Is the inspection result normal? YES >> GO TO 5.
NO >> Replace malfunctioning fuel injector.
5.CHECK INTERMITTENT INCIDENT
Refer to GI-42, "Intermittent Incident".
Is the inspection result normal? YES >> Replace IPDM E/R.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
Component Inspection
1.CHECK FUEL INJECTOR
1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connector.
3. Check resistance between fuel injector terminals as follows.
Is the inspection result normal? YES >> INSPECTION END
NO >> Replace malfunctioning fuel injector.
Electrical load signal
Description
The electrical load signal (Headlamp switch signal, rear window defogger
switch signal, etc.) is transferred
through the CAN communication line.
Component Function Check
1.CHECK REA ...
Fuel pump
Description
*: ECM determines the start signal status by the signals of engine speed and
battery voltage.
The ECM activates the fuel pump for several seconds after the ignition switch is
tu ...
Other materials:
IPDM E/R (Intelligent power distribution
module engine room)
Reference Value
VALUES ON THE DIAGNOSIS TOOL
TERMINAL LAYOUT
PHYSICAL VALUES
Wiring Diagram — Sedan
Fail Safe
CAN COMMUNICATION CONTROL
When CAN communication with ECM and BCM is impossible, IPDM E/R performs
fail-safe control. After CAN
communication recov ...
Maintenance requirements
Your NISSAN has been designed to have minimum
maintenance requirements with long service
intervals to save you both time and money.
However, some day-to-day and regular maintenance
is essential to maintain your NISSAN’s
good mechanical condition, as well as its emissions
and engine perform ...
Monitor, climate, audio, phone and voice
recognition systems
WARNING
● Positioning of the heating or air conditioning
controls and display controls
should not be done while driving in order
that full attention may be given to
the driving operation.
● Do not disassemble or modify this system.
If you do, it may result in accidents,
fire, o ...