Mitsubishi 3000GT Service Manual page 221

VEHICLE SPEED SENSOR (Mechanical Speedometer Type)
Vehicle speed sensor
(reed switch)
, Speedometer
Terminal voltage (V)
Frequency (Hz)
Vehiclespeed [km/h (mph)]
OPERATION
The vehicle speed sensor which is located in the speedometer converts the vehicle speed into a
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pulse signal and inputs it to the engine control module, which then provides the idle speed control,
etc. based on this signal.
The vehicle speed sensor generates the vehicle speed signal by repeatedly opening and closing
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between the voltage of about 5 V applied from the engine control module and ground using a reed
switch.
TROUBLESHOOTING HINTS
If there is an open or short circuit in the vehicle speed sensor signal circuit, the engine may stall when
the vehicle is decelerated to stop.
HARNESS INSPECTION
On-Vehicle Inspection of MFI
MULTIPORT
FUEL INJECTION - Components
Check the vehicle speed sensor
output circuit for continuity.
Engine control module con-
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nector: Disconnected
Move the vehicle.
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Continuity
Engine control
module harness
side connector
TSB
Revision
Enginecontrol module
A Equipment side
connector
B Equipment side
connector
64
Vehicle speed sensor