Kohler Aegis LH640 Manual del usuario - Página 17

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Kohler Aegis LH640 Manual del usuario

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
permanently preset and controlled by the ECU. The
standard low idle speed is 1500 RPM* (+ 75 RPM).
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.
Possible Cause No
Improper
Problem
Fuel
Will Not Start
•
Hard Starting
•
Stops Suddenly
•
Lacks Power
Operates Erratically
Knocks or Pings
Skips or Misfires
Backfires
Overheats
High Fuel Consumption
Dirt In
Fuel
Fuel Line/SystemGrass Screen Oil Level
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
*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 be
using internal programming for cold running, and the
idle speed may vary from the manual setting. 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 27.
Figure 27. EFI Throttle Body Manifold.
Dirty
Incorrect
Overloaded
•
•
•
•
•
•
•
•
•
•
Engine
Dirty Air
Cleaner
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Faulty
Spark Plug
•
•
•
•
•
•
•
•
•
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