If the engine runs jerkily or stalls at idle, the cause may be a defective crankshaft position sensor. To check, start the engine and pull the wires at the sensor connector in different directions. If the engine stalls, replace the connector.
If the engine does not start, pull the cable at the connector while the starter is running. If the engine starts and stalls again, replace the connector.
Turn the engine over with the starter. If the tachometer does not show the number of revolutions, the following failures may occur: a defective crankshaft position sensor, a broken toothed belt, a failure of the ignition coil or a powerful buffer transistor.
Disconnect the crankshaft position sensor plug connection at the mudguard. Connect the voltmeter to contact 2 of the cable part of the connector and ground, see Fig. K-2210. Turn on the ignition. Required value: battery voltage, approximately 11-13 V.
Connect the positive lead of the voltmeter to contact 1 and measure the voltage on this contact of the crankshaft position sensor connector. The required value is 4.8-5.2 V; if there is a deviation, check the quality of the ground.
Check the quality of the ground. To do this, turn off the ignition and connect an ohmmeter to contact 2 and ground. The required value is 0 Ohm.
Differences in connector pinout:
- 1.5L engine, manufactured from 9.88 to 8.90: power supply = terminal 3; mass = pin 2, output = pin 1
- 16-valve engine, produced from 9.88 to 8 90: power supply = contact 2; ground = pin 1, output = pin 4.
- 16-valve engine, production from 9.90 to 2.92 power supply = contact 3, ground = contact 4, output = contact 2, see also connector (B) in Fig. K-2210.
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