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 (Cp) Sensor
To provide EEC system with accurate timing reference, the rear of the crankshaft is fitted with a 4-lobe pulse ring. See Fig 1. The ring is positioned 10 degrees in advance of TDC, to set basic engine timing at 10°BTDC. The crankshaft position sensor is fitted on rear, right side of engine block. See Figure.
As crankshaft rotates, the lobes of the pulse ring pass the crankshaft position sensor. The sensor's magnetic field is interrupted and an output voltage pulse is generated and sent to the ECA.
The ECA uses these pulses to determine crankshaft position for ignition timing. Since the crankshaft position sensor tells the ECA when to fire the ignition module, a defective sensor or sensor wiring can prevent the vehicle from starting.
Use the Manual With the Right Hardware
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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.
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