Kohler Command PRO ECH749 Руководство пользователя - Страница 11
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General
The precision components inside the fuel pump
module are not serviceable. DO NOT attempt to open
the fuel pump module. Damage to the components
will result and the warranty will be void. Because the
fuel pump module is not serviceable, the engines are
equipped with a special 10-micron EFI fuel filter (J)
to prevent harmful contamination from entering the
module.
If there are two filters in the system, the one before
the lift pump will be a standard 51-75 micron filter,
and the one after the lift pump will be the special
10-micron filter. Be sure to use an approved 10-micron
filter for replacement.
Service
Periodically inspect the filter and replace every 200
operating hours or more frequently under extremely
dusty or dirty conditions. Use only a genuine Kohler
filter (Kohler Part No. 25 050 42-S) and install it
according to the directional arrows. Failure to use the
proper filter can result in engine damage and void the
warranty.
Fuel Line
These engines use low permeation rated fuel lines,
certified to comply with California and U.S. EPA
evaporative emission requirements. Fuel lines that do
not meet these requirements may not be used. Order
replacement hose through a Kohler Service Center.
A high pressure fuel line runs between the high
pressure pump and the injectors. This special fuel
line, capable of withstanding the high pressure of the
EFI fuel system meets SAE R9 specifications. If fuel
line must be replaced, see your Kohler Engine Service
Center.
Electronic Fuel Injection (EFI) System
The EFI system is a complete, electronically-
controlled, fuel management system, designed to
deliver a precisely controlled fuel flow under all
operating conditions. The electronic control unit
(ECU), the brain of the system, automatically adjusts
fuel delivery and ignition timing based upon load,
speed, operating temperature, and exhaust emission
levels. The low idle speed is the only manual
adjustment possible. The ECU continuously monitors
operation of the EFI system. If it detects a problem
or fault within the system, it will illuminate the
Malfunction Indicator Light (MIL) (if so equipped).
This is a signal that normal, programmed operation
has been affected, and service by an authorized Kohler
Engine Service Center is required. In most cases a MIL
light may be added to an engine, see Parts Ordering.
Troubleshooting
If the MIL comes on, or the engine becomes hard to
start, runs roughly, or stalls at low idle speed, initial
checks should be made in the following areas:
•
Check that the fuel tank is filled with clean, fresh
gasoline, and shut-off valve (if so equipped) is
opened completely.
•
Check that the fuel tank vent cap is not blocked
and it is operating properly (non-California
models).
•
Check that the air cleaner element and precleaner
are clean and all components are properly
secured. Clean or replace as necessary.
•
Check that the proper fuel filter is being used,
and it is clean and unobstructed. Replace filter(s)
only with genuine Kohler parts.
•
Check that all connections to sensors, ECU, and
fuel injectors are properly secured.
•
Check that there is 12 volt battery is being used
and is fully charged.
•
Check that fuses are not burned out. If so then
replace.
If these checks do not correct the problem, or the MIL
remains on, further diagnosis and servicing by an
authorized Kohler Engine Center is necessary.
Adjustment – Throttle Body
10
See Figure
Low Idle Speed (RPM) is the only adjustment that
can be made. All other fuel calibrations are controlled
by the ECU. The standard low idle speed is 1500 RPM
(± 75 RPM).
NOTE:
The actual low idle speed depends on
the application -- refer to equipment
manufacturer's recommendations.
When an EFI engine is started cold, the ECU will
briefly set a higher (200-400 RPM) low idle speed,
similar to a fast idle. Do not attempt to perform any
readjustment during this warm-up period.
If adjustment is to be made, the engine must be at
operating temperature, air cleaner in place, and check
engine light must be off (no fault codes present).
1.
Start the engine and run at half throttle for 5 to 10
minutes to warm up.
2.
Place the throttle control into the idle or slow
position.
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