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 MANUALSCHEVROLET1993ASTRO VAN L AWD V6-262 4.3L VIN W CPIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMKNOCK SENSORDESCRIPTION AND OPERATION
1993 Chevrolet Astro Van L AWD V6-262 4.3L VIN W CPI
Knock Sensor: Description and Operation
1993 Chevrolet Astro Van L AWD V6-262 4.3L VIN W CPISECTION Description and Operation
PURPOSE:
The Knock Sensor (KS) is used to detect engine detonation (ping). The control module will retard the electronic spark timing up to 8° based on the signal received.
CONSTRUCTION
The KS system has two major components:
- Control Module.
- Knock Sensor(s). The two knock sensors are spliced together and go directly to the control module.
OPERATION
The knock sensor internal circuit causes the control modules 5 volts to be pulled down to about 2.5 volts. The knock sensor produces an A/C signal which rides on the 2.5 volts DC signal. The AC voltage monitor in the control module will detect this AC voltage and provide a signal to begin retarding spark until the knock diminishes. The amplitude and frequency are dependent upon the knock level.
LOCATION
Engine block.
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.