Checking the crankshaft position sensor (Hyundai Sonata EF)

Contents: General information ⇓ Troubleshooting Guide ⇓ Checking with a tester ⇓

General information

The operating principle of the crankshaft position sensor is based on the Hall effect. The sensor determines the position of the crankshaft cranks (piston position) for all cylinders and converts this data into signals (pulses).

Based on these signals, the electronic engine control unit determines the engine crankshaft speed (RPM) and adjusts the moment the injector starts to open and the duration of its open state, as well as the ignition timing.

Nominal supply voltage of the sensor: voltage of the on-board network
Voltage (amplitude) of the sensor signal: 0-5 V
Gap between rotor and sensor tip: 0.5-1.8 mm

Engines 2.0 l / 2.4 l.

Engine 2.7 l.

Troubleshooting Guide

1. If you feel sudden jolts when driving or the engine suddenly stalls, try moving the crankshaft position sensor connector. If the engine stalls, there may be poor contact in the sensor connector.

Engines 2.0 l/2.4 l.

2. If, when the crankshaft is cranked by the starter, the sensor output signal corresponds to 0 rpm and the engine does not start, then the crankshaft position sensor may be faulty, the timing belt may be torn, or the ignition system may be faulty.

3. If engine idling is possible even when the crankshaft position sensor readings differ from the nominal value, the cause is usually one of the following faults (not related to the sensor):

a) Coolant temperature sensor malfunction.
c) Incorrect adjustment of the engine idle speed.

4. The engine can run without a signal from the crankshaft position sensor, but restarting the engine will not be possible. The TDC position data determined by the sensor is stored in memory until the next attempt to start the engine.

Checking with a tester

1. Connect a tachometer (checking the operation of the ignition coil using a tachometer) and make sure that the engine crankshaft speed when cranked by the starter matches the tester readings.

2. Perform a crankshaft position sensor test under the following conditions: engine idling, fully closed throttle position switch in the "ON" position.