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Yamaha YZ450F Owner's Service Manual: Fuel Injection System; Checking The Fault Codes

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FUEL INJECTION SYSTEM

TROUBLESHOOTING METHOD
Engine starting problems, engine
idling speed problems, and medium
and high-speed performance prob-
lems
1. CHECK:
• Refer to "TROUBLESHOOTING"
section in the chapter 3.
2. Connect the FI diagnostic tool.
(Refer to "CONNECTING THE FI
DIAGNOSTIC TOOL".)
3. Check the fault code number.
(Refer to "TROUBLESHOOTING
DETAILS".)
• Check the fault code number that is
displayed on the LCD of the FI diag-
nostic tool.
• Identify the system with the mal-
function.(Refer to "TROUBLE-
SHOOTING DETAILS".)
4. Checking and repair the probable
case of malfunction.
• Fault code No. YES.
Check and repair.
Refer to "TROUBLESHOOTING
DETAILS".
Refer to "SENSOR OPERATION
TABLE".
• Fault code No. NO.
Check each sensor and actuator
in the diagnostic mode.
Refer to "SETTING THE DIAG-
NOSTIC MODE".
Refer to "SENSOR OPERATION
TABLE".
If the sensors or actuators are
damaged, check and, if neces-
sary, repair or replace all faulty
parts.
If the sensors or actuators are not
damaged, check and, if neces-
sary, repair or replace the engine
inner parts.
5. Perform ECU reinstatement ac-
tion.
Refer to "Reinstatement method"
of table in "TROUBLESHOOTING
DETAILS".
6. Set the switch on the FI diagnostic
tool sub-wire harness from "OFF"
to "ON", and then check whether
a fault code number is displayed
again.
If other fault code displayed, repeat
steps (2) to (5) until all fault code
number is not displayed.
7. Set the switch on the FI diagnostic
tool sub-wire harness to "OFF",
and then disconnect the FI diag-
nostic tool, FI diagnostic tool sub-
wire harness, and battery. Place
the accessory coupler in its origi-
nal position.
The malfunction history is stored
even if the switch on the FI diagnostic
tool sub-wire harness is set to "OFF".
Erase the malfunction history in the
diagnostic mode. (Refer to "DIAG-
NOSTIC CODE TABLE (Diagnostic
code No. D62)".)
CONNECTING THE FI
DIAGNOSTIC TOOL
1. Connect the following items to the
accessory coupler as shown.
• FI diagnostic tool "1"
• FI diagnostic tool sub-wire har-
ness "2"
• Battery "3"
• Because this vehicle is not
equipped with a battery, a 12 V
battery is required to use the FI di-
agnostic tool.
• Make sure that the switch on the
FI diagnostic tool sub-wire har-
ness is set to "OFF".
• The "POWER" LED (green)
comes on.
FI diagnostic tool
YU-03182/90890-03182
FI diagnostic tool sub-
wire harness
YU-03212/90890-03212
7-9
FUEL INJECTION SYSTEM
CHECKING THE FAULT CODES
1. Set the switch on the FI diagnostic
tool subwire harness to "ON".
When the switch on the FI diagnostic
tool sub-wire harness is set to "ON",
make sure that "Waiting for connec-
tion" is displayed on the LCD of the FI
diagnostic tool.
2. Check:
• Fault code number
• If a malfunction is detected in the
system, the fault code appears on
the LCD of the FI diagnostic tool
and the "WARNING" LED (orange)
comes on.
• To start the engine, set the switch
on the FI diagnostic tool sub-wire
harness to "OFF".
• When the engine is running, fault
code numbers will not be displayed
on the LCD of the FI diagnostic tool
even if a malfunction is detected in
the system. The "WARNING" LED
(orange) comes on.
2100
3. Set the switch on the FI diagnostic
tool subwire harness to "OFF".
60
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  • Rob Apr 28, 2017 08:33:
    Thank you for the manuals. Yzf450 braap!