Owner`s manual

76
Bulletins, Etc.
4
OHMs Tests
Remove the GCU and unplug the wiring harness. See Figure
6 and 7.
The following two tests are for measuring the resistance of
the DLA circuit that send a signal to the GCU. If either test
fails the DLA is no good and should be replaced. If both
test are good the DLA is neither shorted or open, it is good.
An another component, connection or input is most likely at
fault.
Test 1: Identify the following wire ends in the plug.
Using a digital multi-meter set to the lowest scale (0-200
ohms) place the probes onto the harness making sure of a
good connection. Resistance should be between 47.7 and 58.3
ohms. See Figure 10.
If test 1 checks okay locate the following wire ends in the
plug, and check using test #2.
Test #1 Probe
Locations
Test #2 Probe
Locations
Figure 10. Test #1 Probe Locations for OHMs Test.
Figure 11. Test #2 Probe Locations for OHMs Test.
Green LED
Light
Yellow LED
Light
Figure 14. Governor Control Unit.
Blink Code Tests for the GCU
Speed control issues can also be diagnosed utilizing the on-
board - “Blink Code” diagnostic lights equipped in the GCU.
See Figure 14. These GCUs store blink codes/trouble codes,
can be quickly diagnosed using the light code charts. See
Figures 15 and 16.
Figure 12. 6 Pin Connector.
Figure 13. Red Wire with Yellow Tracer.
Red Wire
w/Yellow
Tracer
Test 2: Identify the following wire ends in the plug.
Using a digital multi-meter set to the lowest scale (0-200
ohms) place the probes onto the harness making sure of a
good connection. Resistance should be between 47.7 and 58.3
ohms. See Figure 11.
If either test 1 or 2 fail the resistance test, the fault could also
be caused by a break/cut in the wiring harness. Inspect and
test for a potential harness issue prior to replacing the DLA
assembly.
Red Wire
w/Yellow
Tracer
Speed Control Input
The connection is either a single wire red w/yellow tracer, or
a 6 pin connector body with a red wire w/yellow tracer. See
Figures 12 or 13.