Pressure and temperature. Volvo S40 / V40 (from 1996 to 2000, the year of issue)

REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Volvo S40 / V40 (from 1996 to 2000, the year of issue)

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Fig. 9.1. Engine Management System Fenix 5.1: 2/14 - the relay system of the engine; 3/1 - the ignition switch; 4/1 - block engine control system Fenix 5.1; 6/13 - the fuel pump; 7/15 - heated oxygen sensor (NO2S); 7/21 - speed sensor (RPM) gasoline engine;

7/22 - Sensor Manifold Absolute Pressure (MAP sensor); 7/23 - coolant temperature of the engine (ECT); 7/24 - air temperature sensor input; 7/25 - throttle position sensor; 7/26 - knock sensor (KS); 7/27 - the camshaft position sensor; 8/2 - a regulator of idling (IAC); 8/6, 8/7, 8/8, 8/9 - injectors; 8/12 - purge valve of the coal filter (CP); 10/51 - warning lamp exhaust gas temperature; 11/2 - the fuse box in the passenger compartment; 24/20 - 22-pin connector harness of the passenger compartment (C), the wiring in the engine compartment (A) (gray); 24/23 - 22-pin connector harness of the passenger compartment; 24/27 - 12-pin connector wiring harness in the engine compartment

(A) - harness the engine control module (ECM); 24/33 - 4-pin harness the engine control module (UST) (B) (Q); 31/25 - prong under the dashboard

The value of the vacuum in the intake manifold of the engine and the intake air temperature measured by an electronic pressure sensor 7/22 (Fig. 9.1) and the intake air temperature 7/24.

Signals from the sensors are used to calculate the BU engine load.

Fig. 9.3. Graphs of characteristics: a - a pressure sensor in the intake manifold; b - the air temperature sensor

Boo at the pressure sensor supply voltage of 5 V. The deflection, resulting in the resistance of the diaphragm varies as the pressure changes. These changes are recorded by an electronic circuit, which generates and amplifies the signal so that the sensor output varies in the range from 0.5 to 5, depending on the pressure (Fig. 9.3). With DR sensor temperature is fed the nominal voltage of 5 V. The resistance of the thermistor, and hence the signal voltage is changed depending on the temperature of intake air.