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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) (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 a good 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 Service Center is necessary.

Adjustment – 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 13.

Figure 13. Throttle Body Manifold.

Fuse Replacement

This engine has 3 blade type automotive fuses.

Replacement fuses must have the same rating as

the blown fuse. Use the fuse rating chart below to

determine the correct fuse. See Figure 14.

Wire Color

2 Solid Red Wires

1 Red Wire with Black Stripe

1 Red Wire with White Stripe

2 Purple Wires

Figure 14. Fuse Rating Chart.

To replace a fuse:

1. Shut engine off and remove key.

2. Locate the fuse holders.

3. Remove the fuse cover and pull out fuse. See

Figure 15.

Adjusting

Screw

Fuse Rating

10-amp Fuse

30-amp Fuse