Kohler Command CV730 User Manual download pdf (Page 97)

5B.30

Section 5B

EFI Fuel System

Fuel System

WARNING: Fuel System Under Pressure!

The fuel system operates under high pressure. System

pressure must be relieved through the test valve in the fuel

rail prior to servicing or removal of any fuel system

components. Do not smoke or work near heaters or other fire

hazards. Have a fire extinguisher handy and work only in a

well-ventilated area.

The function of the fuel system is to provide sufficient

delivery of fuel at the system operating pressure of 39

psi ± 3. If an engine starts hard, or turns over but will

not start, it may indicate a problem with the EFI fuel

system. A quick test will verify if the system is

operating.

1. Disconnect and ground the spark plug leads.

2. Complete all safety interlock requirements and

crank the engine for approximately 3 seconds.

3. Remove the spark plugs and check for fuel at the

tips.

a. If there is fuel at the tips of the spark plugs the

fuel pump and injectors are operating.

b. If there is no fuel at the tips of the spark plugs,

check the following:

1) Make sure the fuel tank contains clean,

fresh, proper fuel.

2) Make sure that the vent in the fuel tank is

open.

3) Make sure the fuel tank valve (if so

equipped) is fully opened.

4) Make sure the battery is supplying proper

voltage.

5) Check that the fuses are good, and that

no electrical or fuel line connections are

damaged or broken.

6) Test fuel pump and relay operation as

described earlier under ‘‘Fuel Pump –

Service.’’

Fault Codes

The ECU continuously monitors engine operation

against preset performance limits. If the operation is

outside the limits, the ECU activates the MIL and

stores a diagnostic code in its fault memory. If the

component or system returns to proper function, the

ECU will eventually self-clear the fault code and turn

off the MIL. If the MIL stays illuminated, it warns the

customer that dealer service is required. Upon receipt,

the dealer technician can access the fault code(s) to

help determine what portion of the system is

malfunctioning. The 2-digit fault codes available based

upon the style of ECU are listed on pages 5B.31-5B.32.

The codes are accessed through the key switch and

displayed as blinks or flashes of the MIL. Access the

codes as follows:

1. Start with the key switch off.

2. Turn the key switch on-off-on-off-on, leaving it

on in the third sequence. The time between

sequences must be less than 2.5 seconds.

3. Any stored fault codes will then be displayed as a

series of MIL blinks (from 2 to 6) representing the

first digit, followed by a pause, and another series

of blinks (from 1 to 6) for the second digit (see

Figure 5B-40).

a. It’s a good idea to write down the codes as

they appear, as they may not be in numerical

sequence.

b. Code 61 will always be the last code

displayed, indicating the end of code

transmission. If code 61 appears immediately,

no other fault codes are present.

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 216 217

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Kohler Command CV730 User Manual Page 97

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