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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 thor-
oughly troubleshoot the entire system before replacing
the EPS assembly.
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 tachome-
ter 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
6. Engine Stop Switch in Stop position with Ignition
Key switch ON.
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.
C1315 Engine RPM Faulty
Engine RPM CAN signal received by
the EPS incorrect or missing
Broken main harness CAN wires or
defective ECM.
EPS will auto-recover when engine
RPM signal returns to normal
C1316 EEPROM Error
EPS internal memory error has been
detected
Internal EPS condition
Correct EPS condition*
C1317 CAN Bus Error
The EPS has lost CAN communica-
tion with the EFI ECM
Broken CAN wires in the main harness.
EFI ECM connector has been discon-
nected.
Correct EPS condition*
C1318 Internal CRC Error
EPS internal CRC calculation condi-
tion has been detected
EPS reflash has failed. Battery power
was lost, or the keyswitch was turned off,
during EPS reflash programming.
EPS must be reprogrammed
C1319 Boot Counter Exceeded
EPS internal application code condi-
tion has been detected
Intermittent power has prevented a suc-
cessful application code launch.
Correct EPS power condition*
C1320 Incorrect Vehicle
Speed-to-RPM Ratio
Vehicle speed signal received by the
EPS exceeds 10 MPH, but the engine
RPM signal less than 500 RPM
Intermittent or broken main harness RPM
wires, intermittent voltage regulator, inter-
mittent or broken ACG stator wires.
Correct EPS condition*
C1321 Vehicle Speed Erratic
Vehicle speed signal received by the
EPS changing at an unrealistic rate
Intermittent main harness, intermittent
speed sensor, dirty speed senor or trigger
wheel.
Correct EPS vehicle speed signal
condition*
C1322 Engine RPM Lost
Engine RPM signal received by the
EPS exceeds 500 RPM and then is
zero or missing
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
C1323 "EPS OFF" Gauge Dis-
play
Battery power has been applied to the
EPS for more than 5-minutes, but no
engine RPM signal has been
detected
The EPS has been automatically dis-
abled, after 5-minutes of inactivity, to con-
serve battery power.
EPS will auto-recover when engine
is started or the keyswitch is cycled
On-Off-On
C1324 Loss of CAN communica-
tion with EPS unit
The gauge has lost CAN communica-
tion with the EPS
Broken CAN wires in the main harness or
disconnected EPS. This is not an EPS
generated DTC; gauge DTC display only.
Gauge DTC display will clear when
the EPS-to-gauge CAN communica-
tion is restored.
C1325 Dual Loss
EPS loss of both the vehicle speed
and the engine RPM signals has been
detected
Handlebar switch in the "OFF" position,
the engine stalled (keyswitch "ON"), bro-
ken harness wires, loss of CAN data sig-
nal.
EPS will auto-recover when either
the vehicle speed or engine RPM
signal is restored.
C1326 Rotor Position Encoder
EPS internal rotor position encoder
variance condition has been detected
Internal EPS Condition
Correct EPS condition*
C1327 Voltage Converter Error
(Low)
EPS internal voltage converter
low-voltage condition has been
detected
Internal EPS Condition
Correct EPS condition*
C1328 Voltage Converter Error
(High)
EPS internal voltage converter
over-voltage condition has been
detected
Internal EPS Condition
Correct EPS condition*
C1329 Internal Data Error
EPS internal preloaded data condition
has been detected
Internal EPS Condition
EPS must be reprogrammed
Code
Fault Description
Fault Condition
Possible Cause
EPS Fault Recovery Method
