Kohler COMMAND CV19 Manuale d'uso - Pagina 18

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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), which is mounted

in view of the operator. This is a signal that normal,

programmed operation has been affected, and service

by an authorized Kohler Engine Dealer is required.

NOTE: Do not spray water at the wiring harness or

any of the electrical components, especially

the ECU, as it could cause malfunction,

damage, or failure.

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:

• Make sure the fuel tank is filled with clean,

fresh gasoline, and shut-off valve (if so equipped)

is opened completely.

• Make sure fuel tank vent cap is not blocked and

it is operating properly.

• Make sure the air cleaner element and precleaner

are clean and all components are properly

secured. Clean or replace as necessary.

• Make sure the proper fuel filter is being used, and

it is clean and unobstructed. Replace filter only

with genuine Kohler parts.

• Make sure all connections to sensors, ECU, and

fuel injectors are properly secured.

• Make sure a good 12 volt battery is being used

and is fully charged.

If these checks do not correct the problem, or the MIL

remains on, further diagnosis and servicing by an

authorized Kohler Engine Dealer is necessary.

Adjustment – EFI Throttle Body

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.

3. Turn the low idle speed adjusting screw in or out

and check RPM with a tachometer. See Figure 24.

Fuel Rail

Throttle Body

Intake Manifold

Figure 24. EFI Throttle Body Manifold.

Troubleshooting

When troubles occur, be sure to check the simple

causes which, at first, may seem too obvious to be

considered. For example, a starting problem could be

caused by an empty fuel tank. Some common causes of

engine troubles are listed in the following table.

Do not attempt to service or replace major engine

components, or any items that require special timing

or adjustment procedures. Have your Kohler Engine

Service Dealer do this work.

Low Idle Speed

Adjusting Screw