Governor System
54 24 690 06 Rev. PKohlerEngines.com
Locate Speed Control input wire. This connection is either a single wire red with yellow tracer, or
a 6 pin connector body with a red wire with yellow tracer. See illustration on page 40.
Unplug single spade terminal and connect a jumper wire
to red wire with a yellow tracer on engine wire harness.
Start engine in normal manner as described in Owner’s Manual. (Engine will initially operate at speed it was
last run or shut down, then will go to idle).
Attach open end of jumper wire to positive (+) battery terminal.
Engine speed increases
(if it was at low speed).
Engine speed does not change.
Kohler electronic governor system tests OK. Test
control system of equipment. Refer to Equipment
Manufacturer’s diagnostic procedures for control
system.
Speed
Input
Wire
Test
Fail
Pass
Operation Input Voltage:
0-1 Volts at Idle/9+ Volts at High Speed.
GCU Circuit Test.
Remove GCU and unplug wiring harness. See illustration on page 38.
All other GCU designs: Inspect for LED light illumination when
key is in ON position. If lights do not illuminate, proceed to GCU
ground power test. If power and ground tests are found to be OK,
but no LED light illumination while in key ON position, indications
are the GCU has failed. Replace GCU. If LEDs illuminate, use
blink codes (refer to pages 44 or 46-47) for GCU design in use.
Continued on next page
Proceed to Ground/Power and OHMs test for GCU. Refer to page 39.
or
Probe red with yellow wire
on 6 pin connector.
If GCU is fi rst design (no LED lights)
proceed directly to ground power test.
All other GCU designs see next step.
Refer to GCU Designs on page 40 and identify which design GCU is on engine.
Electronic Governor Troubleshooting Flow Chart (Continued)
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