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 MANUALSPLYMOUTH1997VOYAGER L4-2.4L VIN XREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONFUNCTIONAL OPERATIONINPUTS AND OUTPUTSINPUTSKNOCK SENSOR
1997 Plymouth Voyager L4-2.4L VIN X
Knock Sensor
1997 Plymouth Voyager L4-2.4L VIN XSECTION Knock Sensor
Fig 21 Knock Sensor:
When the knock sensor detects a knock in one of the cylinders, it sends an input signal to the PCM. In response, the PCM retards ignition timing for all cylinders by a scheduled amount.
Knock sensors contain a piezoelectric material which sends an input voltage (signal) to the PCM.
- As the intensity of the engine knock vibration increases, the knock sensor output voltage also increases.
The knock sensor threads into the side of the cylinder block in front of the starter (Fig. 21).
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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.