Detailed information on other sensors is provided in the relevant Parts of the Chapter Power supply system. These include the coolant temperature sensor, the intake air temperature/pressure sensor and the throttle potentiometer with an idle speed stabilization switch built into it.
Knock sensor
Removal
1. Disconnect the negative cable from the battery.
2. The sensor is installed at the rear of the cylinder block. Access to it from above is extremely limited (especially on 1.6L models). if the sensor is equipped with a heat shield, use a wrench to unscrew the bolt securing the latter.
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3. Disconnect the knock sensor wiring connector.
4. Unscrew the mounting bolt and remove the sensor.
Installation
Installation is performed in the reverse order. The mounting bolt must be tightened strictly with the required force - the correct functioning of the sensor depends on this.
Crankshaft speed and position sensor
Bosch Mono-Motronic System
1. The sensor is installed on top of the manual transmission housing.
2. Disconnect the 3-pin electrical connector located in the bracket attached to the thermostat housing. Release the connector plug from the bracket.
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3. Loosen the mounting bolt and remove the sensor from its mounting socket in the gearbox housing. Inspect the sensor's working element for signs of damage or contamination with dirt.
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Simos 2P
1. Installation is carried out in the reverse order. First, thoroughly clean the sensor from dirt. Tighten the mounting bolt with the required force.
2. The procedures for removing and installing the speed and crankshaft position sensor in the Simos 2P system are similar to those described for the Mono-Motronic system. The only difference is that the wiring connector in this case is installed directly on top of the sensor.
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Magneti-Marelli 1AV
This system uses a Hall sensor built into the distributor assembly. Since replacing the sensor requires disassembling the distributor, it is best to leave this task to qualified auto service technicians.