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3.3.3. Check of components of a control system of the automatic transmission

Check of the sensor of provision of a butterfly valve (TPS)
The sensor of provision of a butterfly valve represents a potentiometer with the sliding contact which moves according to rotation of an axis of a butterfly valve, specifying the angle of opening of the gate. At turn of an axis of a butterfly valve tension of a signal of the sensor of its situation changes. On the basis of change of value of tension of a signal of the sensor and speed of its change the electronic control unit determines by the engine degree and speed of opening of a butterfly valve.

Check of the sensor of temperature of automatic transmission oil

Fig. 3.52. Scheme of check of the sensor of temperature of automatic transmission oil



Remove the automatic transmission oil temperature sensor.
Measure resistance between conclusions 1 and 2 sockets of the sensor in control points.

Nominal rate

Check of the sensor of speed of the car (vehicle speed sensor)

Fig. 3.53. Scheme of check of the sensor of speed of the car


Remove the sensor of speed of the car and connect to it resistance of 3-10 kOhm, as shown in the figure 3.53.
Rotating a shaft of the sensor of speed of the car be convinced that on conclusions 2–3 sockets of the sensor arise tension (4 impulses for one turn).

Check of the operating automatic transmission relay (and/t control relay)

Fig. 3.54. The scheme of check of the operating automatic transmission relay



Remove the operating automatic transmission relay.
By means of wires with the crocodile socket (jumper wires) connect a conclusion 2 the operating automatic transmissions relays with positive (+) the plug of the rechargeable battery, and a conclusion 4 – to the negative plug.
Check a condition of a chain between conclusions 1 and 3 the operating relays at the wires connected and disconnected from plugs of the rechargeable battery.
If operation of the relay differs from specified, replace the operating automatic transmission relay.


Check of electromagnetic valves

Fig. 3.55. Scheme of check of electromagnetic valves



Uncover the case of the operating valves.
Disconnect sockets of each electromagnetic valve.

Fig. 3.56. Measurement of resistance between conclusions of 1 and 2 each electromagnetic valves


Measure resistance between conclusions of 1 and 2 each electromagnetic valves (fig. 3.56).
If resistance exceeds the limit of nominal rate, replace the electromagnetic valve.

Fig. 3.57. Conclusions of the socket of the block of the operating valves



NOTE
Resistance on conclusions of the socket of the block of the operating valves (fig. 3.57).