164
CD070
3. Install the new speed sensor into the housing with
new O-ring lightly coated with multi-purpose grease;
then secure the sensor with the Allen-head cap screw
(threads coated with blue Loctite #242). Tighten
securely.
CD071
Electronic Power
Steering (EPS) (XTZ)
The electronic power steering (EPS) system is an elec-
tro-mechanical device that utilizes 12 volt DC power to
drive a motor linked to the steering shaft to assist the
driver when rotating the steering wheel. Driver steering
inputs are detected by a torque-sensing transducer assem-
bly within the EPS housing. These inputs are converted
to electronic signals by the transducer and control cir-
cuitry to tell the motor which way to drive the steering
shaft. When no steering input (pressure on the steering
wheel) is detected, no torque signal is generated, and no
steering assist is provided by the motor.
The EPS system is battery-system powered; therefore,
the battery must be in good condition and fully charged.
Power delivery and overload protection are provided by
an EPS relay and 30-amp fuse, located under the seat in
the Power Distribution Module (PDM).
If a system malfunction occurs, a malfunction code
“P0635” will be displayed on the LCD gauge. Initially,
the gauge will go blank for 30 seconds and the code will
flash: then the gauge will return to normal except the
code will continue to be displayed.
The following is a list of conditions that can generate a
malfunction code. All conditions with the exception of
item 5 are external to the EPS assembly and therefore can
be cleared without replacement of the EPS assembly.
Make sure to thoroughly troubleshoot the entire system
before replacing the EPS assembly.
NOTE: The EPS assembly is not serviceable and no
service parts or parts lists are available. The EPS is
only serviceable as an assembly and must not be dis-
assembled or EPS warranty will be voided.
Malfunction code P0635 will appear if one of the follow-
ing six conditions occur:
1. Battery system power failure:
A. 30 amp EPS fuse blown
B. EPS relay failure
C. EPS voltage less than 8.5 DC volts for more than
two seconds
2. Ignition switch ON for more than five minutes with
the engine not running.
3. Vehicle Speed Signal Malfunction (engine speed
must exceed 2700 RPM for more than 60 seconds to
generate a malfunction code - timer resets if engine
drops below 2700 RPM).
A. Diode defective (open or shorted)
B. Diode not installed
C. Diode installed in reverse
D. Speed sensor defective
E. Speed sensor signal erratic
F. Speed sensor signal present but without engine
speed signal
G. Speed sensor power from LCD gauge interrupted
H. Incorrect LCD gauge installed
4. Engine Speed Signal Malfunction (vehicle speed must
exceed 5 MPH for more than two seconds - timer
resets if speed drops below 5 MPH.
A. No engine speed signal
B. Erratic engine speed signal
5. EPS Control Circuit Malfunction.
The following procedures may be helpful in determining
the source of a malfunction code:
Condition: Ignition Key Switch ON and NO EPS assist
when moving the handlebar. Code “P0635” flashing.
CAUTION
Do not attempt to check resistance of the EPS motor
(2-pin input receptacle). There are internal capacitors
holding a charge that can cause internal damage to an
ohmmeter.
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