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.
Crankshaft Position Sensor (57X Signal)
The Crankshaft Position (CKP) sensor is a Hall Effect type sensor mounted at front of crankshaft sprocket. Front crankshaft sprocket has 57 teeth and plus a sync gap. CKP sensor will output and on-off pulse as each window passes the sensing element. CKP sensor is connected directly to PCM by a 12-volt reference circuit, a low reference circuit and a CKP sensor signal circuit. PCM uses CKP sensor signal to determine engine RPM. This signal is used to improve idle. If pump cam signal is lost, PCM will use crankshaft position signal data to control injection timing and fuel flow.
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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.