4.15
FUEL INJECTION
4
Fuel Injector Service
Injector problems typically fall into three general categories-
electrical, dirty / clogged, or leakage. An electrical problem
usually causes one or both of the injectors to stop functioning.
Several methods may be used to check if the injectors are
operating.
• With the engine running at idle, feel for operational
vibration, indicating that they are opening and closing.
• When temperatures prohibit touching, listen for a
buzzing or clicking sound with a screwdriver or
mechanic's stethoscope.
• Disconnect the electrical connector from an injector and
listen for a change in idle performance (only running on
one cylinder) or a change in injector noise or vibration.
NOTE: Do not apply voltage directly to the fuel
injector(s). Excessive voltage will burn out the
injector(s). Do not ground the injector(s) with the
ignition on." lnjector(s) will open/turn on if relay is
energized.
If an injector is not operating, it can indicate either a bad injector,
or a wiring/electrical connection problem. Check as follows:
Injector leakage is very unlikely, but in rare instances it can be
internal (past the tip of the valve needle), or external (weeping
around the injector body). The loss of system pressure from the
leakage can cause hot restart problems and longer cranking
times.
Injector problems due to dirt or clogging are unlikely due to the
design of the injectors, the high fuel pressure, the use of filters
and the detergent additives in the gasoline. Symptoms that could
be caused by dirty/clogged injectors include rough idle,
hesitation/stumble during acceleration, or triggering of fault
codes related to fuel delivery. Injector clogging is usually caused
by a buildup of deposits on the director plate, restricting the flow
of fuel, resulting in a poor spray pattern. Some contributing
factors to injector clogging include; dirty air filters, higher than
normal operating temperatures, short operating intervals and
dirty, incorrect, or poor quality fuel. Cleaning of clogged
injectors is not recommended; they should be replaced.
Additives and higher grades of fuel can be used as a preventative
measure if clogging has been a problem.
Fuel Injector Replacement
1.
Engine must be cool. Depressurize fuel system through
test valve in fuel rail.
2.
Remove the front fender assembly and fuel tank.
3.
Thoroughly clean the area around and including the throttle
body / manifold and the injectors.
4.
Disconnect the fuel injector harness(s) at the ECU.
5.
Remove the fuel rail mounting screw and carefully loosen
/ pull the rail away from the injectors.
6.
Reverse the procedures to install the new injector(s) and
reassemble. Use new O-rings any time an injector is
removed (new replacement injectors include new O-rings).
Lubricate O-rings lightly with oil to aid installation. Torque
the fuel rail mounting screw to specification.
CRANKSHAFT POSITION SENSOR
(CPS)
Operation Overview
The engine speed sensor is essential to engine operation,
constantly monitoring the rotational speed (RPM) and position
of the crankshaft.
A ferromagnetic 60-tooth ring gear with two consecutive teeth
missing is mounted on the flywheel. The inductive speed sensor
is mounted 1.0
±
0.26 mm (0.059
±
0.010 in.) away from the
ring gear. During rotation, an AC pulse is created within the
sensor for each passing tooth. The ECU calculates engine speed
from the time interval between the consecutive pulses. The two-
tooth gap creates an “interrupt” input signal, corresponding to
specific crankshaft position for PTO cylinder. This signal serves
as a reference for the control of ignition timing by the ECU.
Synchronization of the CPS and crankshaft position takes place
during the first two revolutions each time the engine is started.
This sensor must be properly connected at all times. If the sensor
fails or becomes disconnected for any reason, the engine will
quit running.
=
T
Fuel Rail Mount Screws
16-20 ft. lbs. (22.6-27 Nm)
Содержание 2008 ranger 700 xp
Страница 1: ...POLARIS RANGER XP 700 4X4 RANGER 6X6 SERVICE MANUAL ...
Страница 3: ...POLARIS RANGER XP 700 4X4 RANGER 6X6 SERVICE MANUAL ...
Страница 15: ...1 12 GENERAL INFORMATION SAE Tap Drill Sizes Metric Tap Drill Sizes Decimal Equivalents ...
Страница 118: ...4 8 FUEL INJECTION FUEL TANK Exploded View Fuel Flow ...
Страница 136: ...5 4 BODY STEERING SUSPENSION Lower Body Components ...
Страница 302: ...10 19 ELECTRICAL 10 COOLING SYSTEM Cooling System Break Out Diagram EY N 6OLT 0OWER ...
Страница 327: ...11 1 WIRE DIAGRAM RANGER 700 EFI 4X4 6X6 CHASSIS PAGE 1 OF 2 ...
Страница 328: ...11 2 WIRE DIAGRAM RANGER 700 EFI 4X4 6X6 CHASSIS PAGE 2 OF 2 ...
Страница 329: ...11 3 WIRE DIAGRAM RANGER 700 EFI 4X4 6X6 DASH ...
Страница 330: ...11 4 WIRE DIAGRAM RANGER 700 EFI 4X4 6X6 BREAKOUTS ...