Self-Diagnostic Function Table (Eps System) - Yamaha Wolverine YX70EPNG Service Manual

EPS (ELECTRIC POWER STEERING) SYSTEM (for EPS models)
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.
a. EPS self-diagnosis signal connector
b. Disconnected
T1: Connector grounded - - - - 0.1
T2: Fault codes deleted - - - - - Maximum 1.5 seconds required
EBS30290

SELF-DIAGNOSTIC FUNCTION TABLE (EPS SYSTEM)

Fault code
No.
11
13
EPS torque sensor
15
16
21 Speed sensor
22 Engine speed signal
41
42
EPS motor
43
45
52 EPS control unit
b
a
c
T1 T1
T1
Item
No normal signals are received from
the EPS torque sensor.
No normal signals are received from
the speed sensor.
No normal signals are received from
the ECU.
No normal signals are received from
the EPS motor.
Relay contacts in the EPS control unit
are welded together.
T1 T1 T1
c. Grounded
1.6 seconds
Symptom
9-78
T2
Probable cause of mal-
function
• Open or short circuit in
wire harness.
• Malfunction in torque sen-
sor.
• Malfunction in EPS control
unit.
• Open or short circuit in
wire harness.
• Malfunction in speed sen-
sor.
• Malfunction in EPS control
unit.
• Open or short circuit in
wire harness.
• Malfunction in ECU.
• Malfunction in EPS control
unit.
• Open or short circuit in
wire harness.
• Malfunction in EPS motor.
• Malfunction in EPS control
unit.
Malfunction in EPS control
unit.