Left: On top of the hose fitting on the left side of the cylinder head on the 5-cylinder model, there is an electronic thermal switch. The pin layout is as follows:
T - temperature indicator;
R - air conditioner;
+ - food;
C - control lamp «coolant overheating».
Right: Models with a 6-cylinder engine have the same electronic thermal switch (arrow) with the same pin layout. It is screwed into the coolant line, to the rear to the right of the engine.
On the reverse side of the instrument cluster, a voltage stabilizer is installed on the side of a small radiator (arrow).
To remove them, you must first remove the instrument cluster (see beginning of chapter). Then unscrew the main panel from behind. Instrument check:
Oil pressure sensor, oil temperature sensor: Disconnect the wire from the respective sensor (installation position, see next section) and lead to «mass»:
If the arrow of the device does not deviate, then either the wiring or the device itself is faulty.
Otherwise, the cause of the malfunction is the sensor.
To remove individual devices, unscrew the cover from below, release the central fastening nut, remove the device.
Clock: check the voltage at the clock contacts with a voltmeter.
Power present, but no indication: the clock is defective.
Installation position of oil pressure sensor, oil temperature sensor
Models with 4-cylinder engine: both sensors are located on the oil filter flange on the left side of the engine.
Models with a 5-cylinder engine: the pressure sensor is located on the left side of the engine block, the oil temperature sensor is located on the lower right side of the engine. It is screwed in there instead of the screw plug for the oil pump relief valve. The plug is under spring tension. The position of the spring and valve plungers is extremely important!
Models with a 6-cylinder engine: the oil pressure sensor is located on cars built before 7/91, at the rear at the left cylinder head, and from 8/91 on the left side of the engine block at the bottom front. The oil temperature sensor is located at the bottom left on the front side of the engine. The wires to the sensors are assembled in a plug-in connection at the back of the left cylinder head. Plug-in cable colors: green-black or black-brown to oil temperature sensor; blue-white or black-and-white to the oil pressure sensor; white/grey for hydraulic switch 1.8 or 2.5 bar; blue-black to hydraulic switch 0.3 bar.
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