SAFARI

13 486 PL ENGINE P SENSORS IN MOTRONIC SYSTEM a) Hot film mass air flow sensor (HFM) It measures the mass flow of air entering into the inlet manifold. Fig. 6 b) Coolant temperature sensor Fig. 7 It detects the coolant temperature and transmits electrical signal to the ECU. It is mounted in the water jacket of the engine on cylinder head. c) Knock sensor Fig. 8 It detects the occurrence of the knock and signals it to the ECU. It consists of a peizo ceramic element. There are two knock sensors for four cylinders. The ECU retards the ignition timing by specific values thereby controlling the knock, if it occurs. d) Engine speed sensor Fig. 9 It senses the engine speed. It picks up signals from sensor wheel mounted on the crankshaft. It is mounted on the cylinder block on left hand front side of the engine. Fig. 7 Fig. 8 Fig. 9 Fig. 6 KNOCKSENSORS ENGINE SPEED SENSOR