Kohler COMMAND CH18-745 User Manual download pdf (Page 85)

5B.26

Section 5B

EFI Fuel System

4. Verify that the governor has been set correctly.

With the linkage still retained in the “Full Throttle”

position (Step 2), unsnap the bushing clip,

separate the linkage from the bushing, and

remove the bushing from the lever. Follow Steps 3

and 4 in ‘‘Checking the Initial Adjustment’’.

5. Reconnect the dampening spring into its governor

lever hole from the bottom. Reinstall the bushing

and reattach the throttle linkage. See Figure 5B-

37. Reattach the governor spring in the marked

hole.

6. Start the engine and allow it to fully warm up and

establish closed loop operation (approximately

5-10 min.). Check the speed settings and adjust

as necessary, first the low idle speed, and then

the high speed setting.

Troubleshooting

General

When troubleshooting a problem on an engine with

EFI, basic engine operating problems must be

eliminated first before faulting the EFI system

components. What appears to be an EFI problem

could be something as simple as a fuel tank with

debris in the bottom or a plugged vent. Be sure the

engine is in good mechanical operating condition and

all other systems are functional before attempting to

troubleshoot the EFI system.

Troubleshooting Guide

Engine starts hard or fails to start when cold

1. Fuel pump not running

2. Faulty spark plugs

3. Old/stale fuel

4. Incorrect fuel pressure

5. Speed sensor loose or faulty

6. TPS offset incorrect (initialization)

7. TPS faulty

8. Engine temperature sensor faulty

9. Faulty coils

10. Low system voltage

11. Faulty injectors

Engine starts hard or fails to start when hot

1. Faulty spark plugs

2. Fuel pump not running

3. Fuel pressure low

4. Insufficient fuel delivery

5. TPS offset incorrect (Initialization)

6. Speed sensor loose or faulty

7. TPS faulty

8. Engine temperature sensor faulty

9. Faulty injectors

Engine stalls or idles roughly (cold or warm)

1. Faulty spark plugs

2. Insufficient fuel delivery

3. TPS offset incorrect

4. TPS faulty

5. Faulty engine temperature sensor

6. Faulty injectors

Engine misses, hesitates, or stalls under load

1. Fuel injector(s), fuel filter, fuel line, or fuel pick-up

dirty/restricted

2. Dirty air cleaner

3. Insufficient fuel pressure or fuel delivery

4. Vacuum (intake air) leak

5. Improper governor setting, adjustment or

operation

6. Speed sensor malfunction

7. TPS faulty, mounting problem or "TPS

Initialization Procedure" incorrect

8. Bad coil(s), spark plug(s), or wires

Low Power

1. Faulty/malfunctioning ignition system

2. Dirty air filter

3. Insufficient fuel delivery

4. Improper governor adjustment

5. Plugged/restricted exhaust

6. One injector not working

7. Basic engine problem exists

8. TPS faulty or mounting exists

9. Throttle plates in throttle body/intake manifold not

fully opening to WOT stop (if so equipped)

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Kohler COMMAND CH18-745 User Manual Page 85

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