Kohler COMMAND CH18-745 User Manual download pdf (Page 75)

5B.16

Section 5B

EFI Fuel System

Figure 5B-21. Injector Inspection Points.

1. Engine must be cool. Depressurize fuel system

through test valve in fuel rail.

2. Disconnect spark plug leads from spark plugs.

3. Remove the air cleaner outer cover, inner wing

nut, element cover and air cleaner element/

precleaner. Service air cleaner components as

required.

4. Remove the two screws securing the air cleaner

base to throttle body manifold. Remove the air

cleaner base to permit access to the injectors.

Check condition of air cleaner base gasket,

replace if necessary.

5. Remove the flywheel screen if it overlaps the

blower housing.

6. If the engine has a radiator-type oil cooler

mounted to the blower housing, remove the two

oil cooler mounting screws.

7. Remove the blower housing mounting screws.

Note the location of the plated (silver) screw

attaching the rectifier-regulator ground lead.

Remove the blower housing.

Figure 5B-20. Volt Test Light.

2. Make sure all safety switch requirements are met.

Crank the engine and check for flashing of test

light. Repeat test at other connector.

a. If flashing occurs, use an ohmmeter (Rx1

scale) and check the resistance of each

injector across the two terminals. Proper

resistance is 12-20

ΩΩ

Ω. If injector resistance is

correct, check whether the connector and

injector terminals are making a good

connection. If the resistance is not correct,

replace the injector following steps 1-8 and

13-16 below.

b. If no flashing occurs, reattach connectors to

both injectors. Disconnect the main harness

connector from the ECU and the connector

from the relay. Set the ohmmeter to the Rx1

scale and check the injector circuit resistance

as follows:

“35 Pin” (MA 1.7) Metal-Cased ECU: Check

the resistance between the relay terminal #87

and pin #35 in main connector. Resistance

should be 4-15

ΩΩ

Ω.

“24 Pin” (MSE 1.0) Plastic-Cased ECU:

Check the resistance between relay terminal

#87 and pin #16 in main connector. Then

check resistance between relay terminal #87

and pin #17. Resistance should be 4-15

ΩΩ

Ω for

each circuit.

“32 Pin” (MSE 1.1) Plastic-Cased ECU:

Check the resistance between relay terminal

#87 and pin #14 in the main connector. Then

check the resistance between relay terminal

#87 and pin #15. Resistance should be 4-15

ΩΩ

Ω

for each circuit.

Check all electrical connections, connectors, and

wiring harness leads if resistance is incorrect.

Injector leakage is very unlikely, but in those rare

instances it can be internal (past the tip of the valve

needle), or external (weeping around the injector

body). See Figure 5B-21. The loss of system pressure

from the leakage can cause hot restart problems and

longer cranking times. To check for leakage it will be

necessary to remove the blower housing, which may

involve removing the engine from the unit.

Check for leaks

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Kohler COMMAND CH18-745 User Manual Page 75

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