FUEL INJECTION SYSTEM
8-59
Fault code No. 42 Symptom A. No normal signals are received from the speed sensor.
B. Open circuit is detected in the neutral switch.
Diagnostic code No. A 07 Speed sensor
B 21 Neutral switch
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
A-1 Connections
• Speed sensor coupler
• Wire harness ECU 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 acti-
vating the
speed sensor
by operating
the vehicle at
20 to 30 km/h.
A-2 Open or short circuit in speed sensor
lead.
• Repair or replace if there is an
open or short circuit.
• Between speed sensor coupler
and ECU coupler.
(blue–blue)
(white/yellow–white/yellow)
(black/blue–black/blue)
A-3 Gear for detecting vehicle speed has
broken.
• Replace if defective.
Refer to “TRANSMISSION” on
page 5-79.
A-4 Defective speed sensor. • Execute the diagnostic mode.
(Code No. 07)
• Replace if defective.
Refer to “CHECKING THE
SPEED SENSOR” on page
8-100.
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