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 MANUALSSATURN1996SC2 L4-1.9L DOHC VIN 7REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCRANKSHAFT POSITION SENSORDESCRIPTION AND OPERATION
1996 Saturn SC2 L4-1.9L DOHC VIN 7
Crankshaft Position Sensor: Description and Operation
1996 Saturn SC2 L4-1.9L DOHC VIN 7SECTION Description and Operation
The PCM receives signals from the crankshaft position sensor to determine the position of the engine at various degrees of rotation.
The EI module does not receive a signal from the crankshaft position (CKP) sensor. Instead the CPK sensor signal is being received and processed by the PCM. The EI module does, however, contain circuitry to determine camshaft position without using a camshaft sensor, by use of compression sense ignition (CSI). The CSI circuitry makes use of the characteristics of a waste spark ignition system, while monitoring a sequence of spark plug gap breakdown events. Capacitive pickup plates located under the 1/4 coil are used to determine whether #1 or #4 fired on a compression stroke. This capacitive sensing device is similar to inductive pickups used on engine analyzers and oscilloscopes.
The EI module does not receive a signal from the crankshaft position (CKP) sensor. Instead the CPK sensor signal is being received and processed by the PCM. The EI module does, however, contain circuitry to determine camshaft position without using a camshaft sensor, by use of compression sense ignition (CSI). The CSI circuitry makes use of the characteristics of a waste spark ignition system, while monitoring a sequence of spark plug gap breakdown events. Capacitive pickup plates located under the 1/4 coil are used to determine whether #1 or #4 fired on a compression stroke. This capacitive sensing device is similar to inductive pickups used on engine analyzers and oscilloscopes.
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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.