Yamaha FZ6-SS, Service Manual

Page: 356 / 435

7-20
FUEL INJECTION SYSTEM
FI
Speed sensor output voltage
When sensor is on
DC 4.8 V or more
When sensor is off
DC 0.6 V or less
Tester positive probe
!
white
Tester negative probe
!
black / blue
1
2
Fault code No. 42 Symptom 1 No normal signals are received from the speed sensor.
2 Open or short circuit is detected in the neutral switch.
Used diagnostic code No. 07 (speed sensor)
!
A1
X
A4
No. 21 (neutral switch)
!
B1
X
B4
Order Inspection operation item and probable
cause Operation item and countermeasure Reinstatement
method
A1 Connected condition of speed sensor
connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the cou-
pler. If there is a malfunction, repair it and connect it
securely.
Speed sensor coupler
Main wiring harness ECU coupler
Reinstated by
starting the
engine, and
inputting the
vehicle speed
signals by
ti th
A2 Open or short circuit in speed sensor
lead. Repair or replace if there is an open or short
circuit.
Between sensor coupler and ECU coupler.
blue - blue
white / yellow - white / yellow
black / blue - black / blue
operating the
motorcycle at a
low speed of
20 to 30 km / h.
A3 Gear for detecting vehicle speed has
broken. Replace if defective.
Refer to “TRANSMISSION” in chapter 5.
A4 Defective speed sensor Execute the diagnostic mode (code No. 07)
Replace if defective.
1. Measure the speed sensor output voltage.
2. Connect the pocket tester (DC 20 V) to the
speed sensor coupler terminal as shown.
3. Measure the speed sensor output voltage.
4. Is the speed sensor OK?
Order Inspection operation item and probable
cause Operation item and countermeasure Reinstatement
method
B1 Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the cou-
pler. If there is a malfunction, repair it and connect it
securely.
Neutral switch connector
Main wiring harness ECU coupler
Reinstated by
starting the
engine, and
inputting the
vehicle speed
i l b
B2 Open or short circuit in neutral switch
lead. Repair or replace if there is an open or short
circuit.
Between switch connector and ECU coupler
sky blue - black / yellow
signals by
operating the
motorcycle at a
low speed of
20 to 30 km / h
B3 Faulty shift drum
(neutral detection area) Replace if defective.
Refer to “TRANSMISSION” in chapter 5.
20 to 30 km / h.
B4 Defective neutral switch Execute the diagnostic mode (code No. 21)
Replace if defective.
Refer to “CHECKING THE SWITCHES” in
chapter 8.