Kohler COMMAND CH18-745 User Manual download pdf (Page 86)

5B.27

Section 5B

EFI Fuel System

Electrical System

The EFI system is a 12 VDC negative ground system,

designed to operate down to a minimum of 7.0 volts. If

system voltage drops below this level, the operation of

voltage sensitive components such as the ECU, fuel

pump, and injectors will be intermittent or disrupted,

causing erratic operation or hard starting. A fully

charged, 12 volt battery with a minimum of 350 cold

cranking amps is important in maintaining steady and

reliable system operation. Battery condition and state of

charge should always be checked first when

troubleshooting an operational problem.

Keep in mind that EFI-related problems are more often

caused by the wiring harness or connections than by

the EFI components. Even small amounts of corrosion

or oxidation on the terminals can interfere with the

milliamp currents used in system operation. Cleaning

the connectors and grounds will solve problems in

many cases. In an emergency situation, simply

disconnecting and reconnecting the connectors may

clean up the contacts enough to restore operation, at

least temporarily.

If a fault code indicates a problem with an electrical

component, disconnect the ECU connector and test

for continuity between the component connector

terminals and the corresponding terminals in the ECU

connector using an ohmmeter. Little or no resistance

should be measured, indicating that the wiring of that

particular circuit is OK. An illustrated listing of

numerical terminal locations, for each style of ECU/

connector is provided on pages 5B.28, 5B.31, or

5B.32.

5B.28 for “35 Pin” (MA 1.7) Metal-Cased ECU

5B.31 for “24 Pin” (MSE 1.0) Plastic-Cased ECU

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

NOTE: When performing voltage or continuity tests,

avoid putting excessive pressure on or

against the connector pins. Flat pin probes

are recommended for testing to avoid

spreading or bending the terminals.

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Kohler COMMAND CH18-745 User Manual Page 86

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