Troubleshooting The Eps - Cub Cadet 2000 Series Professional Shop Manual

Troubleshooting the EPS

Figure 6B.4
When troubleshooting the EPS system, The technician needs to isolate the problem to either the EPS assembly
or the circuits that go to the EPS assembly.
NOTE: To protect the EPS module, it will turn off if the steering input is held at a hard stop for more than 2 sec-
onds. The EPS will turn back on once the input is released from the hard stop.
NOTE: Before troubleshooting any electrical circuit on a tractor, always make sure the battery is fully charged.
NOTE: The EPS assembly has constant battery power and is not controlled by the ignition switch.
40 amp fuse
Figure 6B.5
The first step in troubleshooting the EPS system is to
understand how it works. See Figure 6B.4.
• A constant 12 volts is supplied by the battery
through a 40 amp fuse in the fuse box.
• The EPS is grounded through the green wire.
• The EPS senses the ignition pulses from the igni-
tion module primary windings through the yellow
wire with a white trace.
• Once the EPS determines that the engine is run-
ning (by sensing the ignition pulses from the igni-
tion coil) it will turn on.
• The EPS will power the EPS motor as it senses
input from the steering wheel.
To troubleshoot the EPS assembly:
1 Place the tractor on flat, level ground.
2. Remove any attachments that may be on the tractor.
3. Set the parking brake.
4. Turn the steering wheel so that the wheels are point-
ing straight forward.
5. With the ignition key in the off position, open the
hood.
6. Check the 40 amp fuse in the fuse box.
See Figure 6B.5.
NOTE: If the fuse is blown, replace the fuse and check for
a short in the red wire that goes to the EPS assem-
bly.
Electronic Power Steering
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