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 MANUALSCADILLAC1993FLEETWOOD BROUGHAM V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSKNOCK SENSORDESCRIPTION AND OPERATION
1993 Cadillac Fleetwood Brougham V8-350 5.7L
Knock Sensor: Description and Operation
1993 Cadillac Fleetwood Brougham V8-350 5.7LSECTION Description and Operation
Knock Sensor Cutaway View:
Knock Sensor:
PURPOSE
The knock sensor (KS) detects abnormal vibration (spark knocking) in the engine. The KS is mounted on the engine block near the cylinders. The KS is not actually part of the Distributor Ignition system; rather it is an input signal to the Engine Control Module (ECM) to allow the ECM to determine correct Ignition Control (IC) change of timing and timing advance.
OPERATION
The sensor produces an Alternating Current output voltage which increases as the amount of knock increases. This signal voltage is input to the ECM. The ECM then adjusts the ignition control to reduce spark knocking.
DIAGNOSTIC NOTES
Problems encountered with this circuit should set Diagnostic Trouble Code (DTC) 43.
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.