Camshaft position sensor, speed and crankshaft position. 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

Camshaft position sensor 7/27 (Fig. 9.1) includes a Hall generator signals which allow ECU to determine the duty cycle in different cylinders. Sensor rotor rotates at the same speed as the camshaft. With BU input voltage of 5 V is applied to the Hall generator. When the window is in the rotor of the generator is opposite the Hall input is connected to "weight" and the voltage of the output signal becomes equal to 0 V. When the generator rotor is screened by the Hall voltage output is 5 V.

Since the speed of the camshaft at half the speed of the crankshaft, the output reaches a maximum and a minimum of two turns of the crankshaft, which corresponds to the duty cycle at different engine cylinders.

Speed sensor and crankshaft position 7/21 inductive type supplies the ECU signals the engine speed and the position of the crankshaft.

Thus, with two sensors (camshaft position sensor and the crankshaft position sensor) BU determines which cylinder is necessary to ignite the fuel mixture.