Yamaha RST90GTZ, Service Manual

Page: 337 / 504

FI
7-10
DIAGNOSTIC MODE
It is possible to monitor the sensor output data
or check the activation of actuators without
connecting the measurement equipment by
simply switching the meter indication from the
normal mode to the diagnostic monitoring
mode.
Setting the diagnostic mode
1. Turn the main switch off and set the engine
stop switch to “RUN”.
2. Disconnect the wire harness coupler from
the fuel pump.
3. Simultaneously press and hold the
“SELECT” and “RESET” buttons, turn the
main switch on, and continue to press the
buttons for 8 seconds or more.
TIP
• All displays on the LCDs disappear except
the clock display.
• “dI” appears on the clock display.
4. Check that “dI” appears, and then simulta-
neously press the “SELECT” and “RESET”
buttons for 2 seconds or more to activate
the diagnostic mode. The diagnostic code
number “d:01” appears on the clock display.
5. Select the diagnostic code number corre-
sponding to the fault code number by
pressing the “SELECT” and “RESET” but-
tons.
TIP
• To decrease the selected diagnostic code
number, press the “RESET” button. Press the
“RESET” button for 1 second or longer to
automatically decrease the diagnostic code
numbers.
• To increase the selected diagnostic code
number, press the “SELECT” button. Press
the “SELECT” button for 1 second or longer
to automatically increase the diagnostic code
numbers.
“RESET”
“SELECT”
“d:70
→
d:01”
“d:01
→
d:70”
FUEL INJECTION SYSTEM