9.5
ELECTRICAL
Vehicle Speed Sensor
The vehicle speed sensor is mated to the transmission housing
and reads the speed of the transmission output gear.
The instrument gauge supplies the sensor with battery voltage
via the ORANGE circuit, a reference ground via the BRN/
RED circuit and receives a return signal via the GRN/RED
circuit.
To test the circuit:
1. Turn the ignition key to the ON position and move the
RUN/OFF switch to run.
2. Verify there is battery voltage present on the ORANGE
circuit. If voltage is not found, inspect the wiring harness,
or replace the instrument gauge.
3. If voltage is found, test the BRN/RED ground circuit.
Verify there is continuity between the circuit and chassis
ground.
4. If all circuits function, remove the speed sensor from the
transmission. Verify the sensor is not damaged.
5. Back-probe the GRN/RED and BRN/RED wires with the
connector still connected to the sensor. Turn the
multimeter to measure vDC. Wave a screwdriver back in
forth across the face of the sensor while monitoring the
multimeter.
6. The multimeter display should flip between a voltage and
0vDC every time the screwdriver blade passes by the
sensor face. If this does not occur, replace the sensor.
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