Kohler Command CV730 User Manual download pdf (Page 93)

5B.26

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.26 and 5B.29.

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.

“24 Pin” (MSE 1.0) Plastic-Cased ECU Systems

Pin #

Function

Permanent Battery Voltage

Switched Ignition Voltage

Safety Switch

Throttle Position Sensor (TPS) and Temperature Sensor Ground

Not Used

Oil Temperature Sensor Input

Not Used

Throttle Position Sensor (TPS) Input

Speed Sensor Input

Speed Sensor Ground

Oxygen Sensor Input

Not Used (Oxygen Sensor Ground if needed)

Diagnostic Line

Throttle Position Supply Voltage

Battery Ground

Injector 1 Output

Injector 2 Output

Main Relay Output

Malfunction Indicator Light (MIL)

Not Used (Tach Output if needed)

Not Used

Ignition Coil #1 Output

Ignition Coil #2 Output

TPS Initialization Terminal

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 216 217

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Kohler Command CV730 User Manual Page 93

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