Yamaha Wolverine YX70EPNG, Service Manual

Page: 453 / 503

EPS (ELECTRIC POWER STEERING) SYSTEM (for EPS models)
9-78
After the mode selection judgment is completed (present display or past malfunction mode), the current
fault code signaling stops immediately, and then the EPS warning light starts flashing at 1.5-second in-
tervals.
Deleting fault codes
To delete fault codes, ground the EPS self-diagnosis signal connector 3 or more times within 5 seconds
while the present or past malfunction mode is activated. The currently selected mode remains active
after the fault codes of that mode are deleted.
T1: Connector grounded - - - - 0.1 T1 1.6 seconds
T2: Fault codes deleted - - - - - Maximum 1.5 seconds required
EBS30290
SELF-DIAGNOSTIC FUNCTION TABLE (EPS SYSTEM)
a
b
c
T1 T1 T1 T1 T1 T2
a. EPS self-diagnosis signal connector
b. Disconnected c. Grounded
Fault code
No.
Item Symptom
Probable cause of mal-
function
11
13
15
16
EPS torque sensor
No normal signals are received from
the EPS torque sensor.
• Open or short circuit in
wire harness.
• Malfunction in torque sen-
sor.
• Malfunction in EPS control
unit.
21 Speed sensor
No normal signals are received from
the speed sensor.
• Open or short circuit in
wire harness.
• Malfunction in speed sen-
sor.
• Malfunction in EPS control
unit.
22 Engine speed signal
No normal signals are received from
the ECU.
• Open or short circuit in
wire harness.
• Malfunction in ECU.
• Malfunction in EPS control
unit.
41
42
43
45
EPS motor
No normal signals are received from
the EPS motor.
• Open or short circuit in
wire harness.
• Malfunction in EPS motor.
• Malfunction in EPS control
unit.
52 EPS control unit
Relay contacts in the EPS control unit
are welded together. Malfunction in EPS control
unit.