Kohler ECV940 Service Manual page 97

FIELD INSTALLED UPDATED DESIGN GCU/Harness
Diagnostics and Troubleshooting
This updated design was fi rst released as a fi eld
installed kit with a sealed GCU/wiring harness module
assembly and separate red wire w/yellow tracer speed
control input.
Ground and Power Test
NOTE: This updated design features a sealed GCU
module wiring harness assembly that is serviced
as an assembly and must NOT be separated.
1. Remove 2 screws securing sealed GCU wiring
harness assembly to GCU bracket.
2. Turn ignition key to ON position, inspect LED lights
on GCU board, should indicate solid green and
blinking yellow. If no LED illumination, inspect all
system fuses (10 amp power fuses). If fuses are OK,
proceed to following power/probe test. Turn ignition
key to OFF position.
FIELD INSTALLED UPDATED DESIGN GCU Power
Test/Probe Location
A Negative (-) Ground Probe Location
B Cut Wire Tie to Access Spade or Butt Connector
62 690 05 Rev. H
A
B
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C Red Power (B+) Probe Location
3. Connect DVOM black/ground test lead to ground
eyelet terminal (A).
4. Cut nylon tie (B) to gain access to bullet connector
under protective sleeve.
5. Use Red (B+) DVOM test lead and probe red power
(B+) wire connector (C).
Using a DVOM test for voltage. Turn key switch to ON
position. Voltage should be within +/- 1 volt of battery
voltage. If voltage is within +/- 1 volt of battery voltage,
harness is OK. If no power is measured, inspect all
system fuses (10 amp power fuses). If not within +/- 1
volt of battery voltage, check connections and replace
GCU module wiring harness assembly if necessary.
FIELD INSTALLED UPDATED DESIGN Speed
Control Input
A Red Wire with Yellow Tracer.
This connection is a single wire red with yellow tracer.
Governor System
C
A
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