103
CD071
Electronic Power
Steering (EPS)
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
rider when rotating the handlebar. Rider steering inputs
are detected by a torque-sensing transducer assembly
within the EPS housing. These inputs are converted to
electronic signals by the transducer and control circuitry
to tell the motor which way to drive the steering shaft.
When no steering input (pressure on the handlebar) 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.
NOTE: The EPS assembly is not serviceable and
must not be disassembled or EPS warranty will be
voided.
Code
Fault Description
Fault Condition
Possible Cause
EPS Fault Recovery Method
C1301 Over Current
EPS internal over-current condition
has been detected
Internal EPS Condition
Correct EPS condition*
C1302 Excessive Current Error
EPS internal current measurement
error has been detected
Internal EPS Condition
Correct EPS condition*
C1303 Torque Sensor Range
Fault
EPS internal torque sensor range
condition has been detected
Internal EPS Condition
Correct EPS condition*
C1304 Torque Sensor Linearity
Fault
EPS internal torque sensor linearity
condition has been detected
Internal EPS Condition
Correct EPS condition*
C1305 Rotor Position Encoder
EPS internal rotor position encoder
condition has been detected
Internal EPS Condition
Correct EPS condition*
C1306 System Voltage Low
EPS battery power low-voltage condi-
tion has been detected
System voltage low (less than 11 VDC at
the EPS). Wire harness issue, faulty volt-
age regulator, weak battery or loose bat-
tery terminals.
EPS will auto-recover when the bat-
tery supply returns to normal
C1307 System Voltage High
EPS battery power over-voltage con-
dition has been detected
System voltage high (more than 16 VDC
at the EPS). Wire harness issue, faulty
voltage regulator or loose battery termi-
nals.
EPS will auto-recover when the bat-
tery supply returns to normal
C1308 Temperature Above 110°
C
EPS internal 110o C over-temp condi-
tion has been detected
Clean the EPS housing and cooling fins. EPS will auto-recover when internal
temperature drops below 105° C
C1309 Temperature Above 120°
C
EPS internal 120o C over-temp condi-
tion has been detected
Clean the EPS housing and cooling fins. EPS will auto-recover when internal
temperature drops below 115° C
C1310 Vehicle Speed High
Vehicle speed signal received by the
EPS exceeds the maximum speed
specification
Intermittent main harness wires, defective
speed-sensor, or intermittent speed sen-
sor wires.
EPS will auto-recover when the
vehicle speed signal drops below
the maximum speed specfication
C1311 Vehicle Speed Low
Vehicle speed signal received by the
EPS is zero or missing
Broken main harness wires, defective
speed-sensor, or broken speed sensor
wires.
EPS will auto-recover when the
vehicle speed signal returns to nor-
mal
C1312 Vehicle Speed Faulty
Vehicle speed CAN signal received by
the EPS incorrect or missing
Broken main harness CAN wires, defec-
tive speed-sensor, or broken speed sen-
sor wires.
EPS will auto-recover when the
vehicle speed signal returns to nor-
mal
C1313 Engine RPM High
Engine RPM signal received by the
EPS exceeds the maximum RPM
specification
Intermittent main harness RPM wires,
intermittent voltage regulator, intermittent
ACG stator wires.
EPS will auto-recover when engine
RPM signal drops below the maxi-
mum RPM specfication
C1314 Engine RPM Low
Engine RPM signal received by the
EPS suddenly dropped below 500
RPM
Handlebar switch in the "OFF" position,
broken main harness RPM wires, defect
voltage regulator, broken ACG stator
wires.
EPS will auto-recover when engine
RPM signal returns to normal
