FUEL INJECTION SYSTEM
8-74
Fault code No. 42 Symptom A. No normal signals are received from the rear wheel
sensor.
B. Open or short circuit is detected in the neutral circuit of
the gear position switch.
Diagnostic code No. A 07 Rear wheel sensor
B 21 Gear position switch (neutral circuit)
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
A-1 Connections
• Rear wheel sensor coupler
• Wire harness ECU coupler
• ABS ECU coupler
• ABS wire harness coupler
• Check the coupler for any pins
that may be pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
Starting the en-
gine, and input-
ting the vehicle
speed signals
by operating
the vehicle at a
20 to 30 km/h.
A-2 Open or short circuit in wire harness
and/or ABS wire harness.
• Repair or replace if there is an
open or short circuit.
• Between rear wheel sensor
coupler and ABS ECU coupler.
(white–white)
(black–black)
• Between ABS ECU coupler and
ECU coupler.
(white/yellow–white/yellow)
A-3 Sensor rotor for detecting vehicle
speed has broken.
• Replace the rear wheel.
Refer to “REAR WHEEL” on
page 4-20.
A-4 Defective rear wheel sensor • Execute the diagnostic mode.
(Code No.07)
• Replace if defective.
Refer to “MAINTENANCE OF
THE REAR WHEEL SENSOR
AND SENSOR ROTOR” on
page 4-22.
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