Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHONDA1993ACCORD L4-2156CC 2.2L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSVEHICLE SPEED SENSORDESCRIPTION AND OPERATION
1993 Honda Accord L4-2156cc 2.2L SOHC
Vehicle Speed Sensor: Description and Operation
1993 Honda Accord L4-2156cc 2.2L SOHCSECTION Description and Operation
Vehicle Speed Sensor Circuit:
PURPOSE
The sensor is used by the ECM to determine vehicle speed and by the speedometer to drive the trip odometer/mileage odometer stepper motors and the speedometer driver to indicate vehicle speed.
CONSTRUCTION
The speed sensor is a `quenched oscillator' pulse generator which provides approximately 4000 pulses per mile.
OPERATION
The speed sensor pulses the signal wire, switching its connection to ground on and off. The number of pulses increasing with vehicle speed. This signal is used to operate the stepper motors for the trip/mileage odometer, and the speedometer driver to indicate vehicle speed. This same signal is used by the ECM to determine vehicle speed for PGM-FI operation.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.