Kohler Command CV730 User Manual download pdf (Page 71)

5B.4

Section 5B

EFI Fuel System

During certain operating periods such as cold starts,

warm up, acceleration, etc., an air/fuel ratio richer

than 14.7:1 is required and the system operates in an

“open loop” mode. In “open loop” operation the

oxygen sensor output is not used, and the controlling

adjustments are based on the primary sensor signals

and programmed maps only. The system operates

“open loop” whenever the three conditions for closed

loop operation (above) are not being met.

Important Service Notes!

• Cleanliness is essential and must be maintained

at all times when servicing or working on the EFI

system. Dirt, even in small quantities, can cause

significant problems.

• Clean any joint or fitting with parts cleaning

solvent before opening to prevent dirt from

entering the system.

• Always depressurize the fuel system through the

test valve in the fuel rail before disconnecting or

servicing any fuel system components. See fuel

warning on page 5B.2.

• Never attempt to service any fuel system

component while the engine is running or the

ignition switch is "on".

• Do not use compressed air if the system is open.

Cover any parts removed and wrap any open

joints with plastic if they will remain open for

any length of time. New parts should be removed

from their protective packaging just prior to

installation.

• Avoid direct water or spray contact with system

components.

• Do not disconnect or reconnect the main ECU

wiring harness connector or any individual

components with the ignition ‘‘on.’’ This can send

a damaging voltage spike through the ECU.

• Do not allow the battery cables to touch opposing

terminals. When connecting battery cables attach

the positive (+) cable to the positive (+) battery

terminal first, followed by the negative (-) cable to

the negative (-) battery terminal.

• Never start the engine when the cables are loose

or poorly connected to the battery terminals.

• Never disconnect the battery while the engine is

running.

• Never use a quick battery charger to start the

engine.

• Do not charge the battery with the key switch

‘‘on.’’

• Always disconnect the negative (-) battery cable

before charging the battery, and also unplug the

harness from the ECU before performing any

welding on the equipment.

Electrical Components

Electronic Control Unit (ECU)

Figure 5B-1. “24 Pin” (MSE 1.0) Plastic-Cased ECU.

Figure 5B-2. “32 Pin” (MSE 1.1) Plastic-Cased ECU.

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Kohler Command CV730 User Manual Page 71

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