Operation CHARM: Car repair manuals for everyone.
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

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Circuit Operation

The Speed Sensor Circuit consists of a magnetic type sensor and wiring. Gear teeth pressed on the Transmission Output Shaft induce an alternating current in the sensor. This sensor generates a sine wave output with a frequency proportional to vehicle speed. The Powertrain Control Module (PCM) converts this signal to an output that is switched to ground at a frequency of 4000 pulses per mile at the DK GRN/WHT wire (CKT 817), which feeds the Warning Alarm, Power Steering Control Module, Instrument Cluster and Cruise Control Module.