Yamaha Wolverine YX70EPNG Service Manual page 436

Fault code No.
Item
1 Malfunction in ECU.
Fault code No. Er-1
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.
50
Faulty ECU (Engine Control Unit) memory. (When this malfunction is
detected in the ECU, the fault code number might not appear.)
Replace the ECU.
Er-1
ECU (Engine Control Unit) internal malfunction (output signal error):
signals cannot be transmitted between the ECU and the multi-func-
tion meter.
Able to start engine (unable when ECU is malfunctioning)
Able to drive vehicle (unable when ECU is malfunctioning)
—
—
—
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.
9-61
FUEL INJECTION SYSTEM
Turn the main switch to "
(on).
Check that the fault code num-
ber is not displayed.
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.
"
pletion
"
"
"
"