Governor System
44 24 690 06 Rev. PKohlerEngines.com
Several diff erent GCU designs have been used.
First design (24 584 40-S and earlier) had a black potting compound, did not have LED lights, and did not store
diagnostic trouble codes.
See page 42 for troubleshooting detail and a basic electrical diagram for this GCU design.
See pages 50-52 for a troubleshooting fl ow chart.
Second design did not store codes, but had LED lights for diagnosing a running engine using light codes and blink
code chart.
See pages 43-45 for troubleshooting detail, GCU Blink Codes, and a basic electrical diagram for this GCU design.
See pages 50-52 for a troubleshooting fl ow chart.
Third design stored codes and had LED lights for diagnosing an engine either with key ON or when engine is
running.
See pages 46-48 for troubleshooting detail, GCU Blink Codes, and a basic electrical diagram for this GCU design.
See pages 50-52 for a troubleshooting fl ow chart.
Fourth (latest) design stores codes, has LED lights in a diff erent location, and must be used with latest harness. Kits
are structured in our online parts lookup system. When replacing an earlier design GCU with latest design, ALWAYS
install new GCU and new harness to ensure proper function.
See pages 46-47 for troubleshooting detail and GCU Blink Codes.
See page 49 for a basic electrical diagram for this GCU design.
See pages 50-52 for a troubleshooting fl ow chart.
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