Replacement of sensors of a detonation is necessary for carrying out on the cold engine.
The engine can be damaged as a result of a detonation arising at combustion of a fuel mix. The high extents of compression improving fuel profitability of the engine and change of quality of used fuel, increase tendency of the engine to a detonation, i.e. explosive combustion of a fuel mix in engine cylinders. The sensor of a detonation reacts to high-frequency fluctuations of the block of cylinders and transforms them to the electric signals which size increases at increase in a detonation. On the basis of these signals the control unit the engine displaces the ignition moment towards delay, during a certain number of steps then gradually returns in initial situation. The sensor of a detonation is located on the back party of the block of cylinders, is direct under a block head.
Replacement of sensors of a detonation carry out as follows:
– switch off ignition and disconnect a "weight" wire from the storage battery;
– merge cooling liquid from cooling system;
– on models till 2001 and on all-wheel drive models remove an inlet collector;
– on front-wheel models till 2001 lift a forward part of the car and fix on support;
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Fig. 7.19. The detonation sensor on models till 2001: 1–electric socket; 2–detonation sensor
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Fig. 7.20. The detonation sensor on models since 2001: 1–electric socket; 2–detonation sensor
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– disconnect the electric socket, turn out and remove the detonation sensor
(fig. 7.19, 7.20)
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At installation of the sensor of a detonation put on its carving a hermetic layer.
Screw the sensor and tighten it the moment of 44 N • m.
NOTE
The carving of the new sensor is already covered with hermetic.
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Further installation make in sequence, return to removal. After installation of the sensor fill in cooling liquid in cooling system.