Yamaha Wolverine YX70EPNG Service Manual page 437

Fault code No. Er-2
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Indicated
Procedure
Probable cause of malfunc-
Item
tion and check
1 Connection of meter assembly
coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
2 Connection of ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
3 Wire harness continuity.
4 Defective meter assembly.
5 Malfunction in ECU.
Fault code No. Er-3
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Indicated
Procedure
Probable cause of malfunc-
Item
tion and check
Er-2
ECU (Engine Control Unit) internal malfunction (output signal error):
no signals are received from the ECU within the specified duration.
Able to start engine
Able to drive vehicle
—
—
—
Maintenance job
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Open or short circuit → Replace
the wire harness.
Between meter assembly cou-
pler and ECU coupler.
yellow/blue–yellow/blue
Replace the meter assembly.
Replace the ECU.
Er-3
ECU (Engine Control Unit) internal malfunction (output signal error):
data from the ECU cannot be received correctly.
Able to start engine
Able to drive vehicle
—
—
—
Maintenance job
9-62
FUEL INJECTION SYSTEM
Confirmation of service com-
Turn the main switch to "
(on).
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 2.
Turn the main switch to "
(on).
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 3.
Turn the main switch to "
(on).
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 4.
Turn the main switch to "
(on).
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 5.
Confirmation of service com-
pletion
"
"
"
"
pletion