Manuals through 2025 now available!
Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.
LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
lemon-manuals.la or
lemon-manuals.org.ua
(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)
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Vehicle Speed Sensor: Description and Operation
With the
ignition switch in ON (II) or START (III), battery voltage is supplied from fuse 24 (fuse 12 without SRS) through the BLK/YEL wire to the
Vehicle Speed Sensor (VSS). The sensor is grounded by the BLK wire to G101. The speedometer and other control units in the circuit supply about 5
volts to the YEL/WHT wire. The vehicle speed sensor (VSS) intermittently grounds the YEL/WHT wire which generates a pulsed signal in it. The number of pulse per
minute increases/decreases with the speed of the car.