Crankshaft position sensor
Definition
The crankshaft position sensor reads a toothed wheel (commonly 60-2 teeth) on the crank pulley, flywheel or inside the block to give the ECU engine speed and exact piston position. Without this signal there is no injection or spark, so a dead sensor usually means the engine cranks but will not start, and intermittent dropouts cause sudden stalling when hot that clears after cooling. Inductive types output an AC sine wave whose amplitude rises with RPM; Hall types output a fixed-amplitude square wave and need a supply voltage. Check for metal debris on the tip, cracked target wheels, damaged wiring near the exhaust and correct air gap. Codes: P0335-P0339; a damaged tooth pattern also triggers P0016 correlation and random misfires P0300.
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Codes often stored
- P0016Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor A)
- P0300Random / Multiple Cylinder Misfire Detected
- P0335Crankshaft Position Sensor "A" Circuit
- P0336Crankshaft Position Sensor A Circuit Range/Performance
- P0337Crankshaft Position Sensor A Circuit Low Input
- P0338Crankshaft Position Sensor A Circuit High Input
- P0339Crankshaft Position Sensor A Circuit Intermittent