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;
Fig. 7.19. The detonation sensor on models till 2001: 1–electric socket; 2–detonation sensor
Fig. 7.20. The detonation sensor on models since 2001: 1–electric socket; 2–detonation sensor
– disconnect the electric socket, turn out and remove the detonation sensor
(fig. 7.19, 7.20)
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.
The carving of the new sensor is already covered with hermetic.
Further installation make in sequence, return to removal. After installation of the sensor fill in cooling liquid in cooling system.