Nissan Maxima Service and Repair 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 via 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.
2.CHECK FUEL INJECTOR FUNCTION
With CONSULT
- Start engine.
- Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT.
- Check that each circuit produces a momentary engine speed drop.
Without CONSULT
- Start engine.
- Listen to each fuel injector operating sound.
Clicking sound should be heard.
Diagnosis Procedure
1.CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect fuel injector harness connector.
- Turn ignition switch ON.
- Check the voltage between fuel injector harness connector and ground.
2.DETECT MALFUNCTIONING PART
Check the following.
- 10 A fuse (No. 35)
- IPDM E/R harness connector E10
- Harness for open or short between fuel injector and fuse
3.CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between fuel injector harness connector and ECM harness connector
- Also check harness for short to ground and short to power.
4.CHECK FUEL INJECTOR
5.CHECK INTERMITTENT INCIDENT
Component Inspection
1.CHECK FUEL INJECTOR
- Turn ignition switch OFF.
- Disconnect fuel injector harness connector.
- Check resistance between fuel injector terminals as per the following.
Electronic controlled engine mount
Description
In the idle range, ECM turns OFF the electronically-controlled engine mount
control solenoid valve and applies
manifold pressure to the electronically controlled engine mount. This de ...
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
t ...
Other materials:
Precaution
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and
"SEAT BELTPRE-TENSIONER"
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT
PRE-TENSIONER”, used alongwith a front seat belt, helps to reduce the risk
or severity of injury to the driver and front passeng ...
Driver Attention Alert system limitations
WARNING
Listed below are the system limitations for
the Driver Attention Alert system. Failure
to operate the vehicle in accordance with
these system limitations could result in
serious injury or death.
The Driver Attention Alert system may
not operate properly and may not provide
an alert i ...
P1723 speed sensor
Description
The secondary speed sensor detects the revolution of
parking gear and generates a pulse signal. The pulse
signal is sent to the TCM, which converts it into vehicle speed.
The primary speed sensor detects the primary pulley revolution speed and sends a
signal to the TCM.
DTC Lo ...
Nissan Maxima Owners Manual
- Illustrated table of contents
- Safety-Seats, seat belts and supplemental restraint system
- Instruments and controls
- Pre-driving checks and adjustments
- Monitor, climate, audio, phone and voice recognition systems
- Starting and driving
- In case of emergency
- Appearance and care
- Do-it-yourself
- Maintenance and schedules
- Technical and consumer information
Nissan Maxima Service and Repair Manual
0.0064