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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).
12
*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
10-amp Fuse
30-amp Fuse