Yamaha MTN850-A 2017 Service Manual page 482

EAS30530
BASIC PROCESS FOR TROUBLESHOOTING
[A] Turn the main switch to "ON",
and check the ABS warning
light.
Comes on
[A-3] The ABS warning light comes
on.
Connect the Yamaha
diagnostic tool, and then
execute functional diagnosis.
Can the tool communicate with
the ABS ECU?
Can communicate
[B-1] Check for ABS fault
codes in the screen for the
Yamaha diagnostic tool.
Execute fault diagnosis.
Are fault codes displayed on
the screen?
No
[C-1] Perform the final checks.
Were all of the final checks
completed normally?
Yes
(The ABS warning light
goes off when the light is
checked.)
Finished.
ABS (ANTI-LOCK BRAKE SYSTEM)
Fails to
[A-1] Does only the ABS
come on
warning light fail to
come on?
No
[A-2] Do all indicator lights
fail to come on?
Cannot
communicate
[A-4] Only the ABS ECU
fails to communicate.
No
[A-5] ABS ECU and FI ECU
fail to communicate.
Yes
[B-2] Diagnose by the fault
code.
The reaction force generated
during brake line routing
confirmation is incorrect. Refer to
"[C-1] FINAL CHECK".
No The brake hoses and brake
•
pipes are not connected
correctly.
The ABS warning light does
not go off when the light is
checked. Refer to "[C-1]
FINAL CHECK".
• The malfunction is not
corrected.
There is a break in the wire
•
harness between the ABS ECU
and the meter assembly.
The meter assembly circuit
•
is defective.
The ABS warning light circuit
•
in the hydraulic unit assembly
is defective.
The ABS warning light (LED)
•
Yes
is defective.
The wire harness is grounded
•
between the ABS ECU and the
meter assembly.
The meter assembly circuit is
•
defective.
The hydraulic unit assembly is
•
defective.
The main switch is defective.
•
Yes
The battery voltage is low.
•
The main fuse is blown.
•
The meter assembly circuit is
•
defective.
• The ABS ECU fuse is blown.
Yes
The ABS ECU coupler is
•
disconnected.
The wire harness is defective.
•
The hydraulic unit assembly
•
is defective.
Yes
The connection with the Yamaha
•
diagnostic tool is defective.
• The wire harness is defective.
[B-3] Delete the fault codes.
8-125
Return to [A].
Return to [A].
Return to [A].
Return to [A].
Return to [A].
Return to [A].