Service manual

06-9
ENGINE OIL TEMPERATURE SENSOR
Assembled on the cylinder head
Engine temperature sensor is used to measure the engine oil temperature. It senses
the oil temperature and provides the input to the ECU which calculates the average
engine temperature. The ECU accordingly operates the injector to optimise the air
fuel ratio. The engine temperature sensor is located in the cylinder head underneath
the inlet manifold and on the oil passage.
Specification:
Operating temperature : –30º C to
+120º C
Operating Voltage : 5 ± 0.5 V.
Resistance Value w.r.t. Temperature
–20º C –– 18.8 Kilo Ohms
+ 40º C –– 1.136 Kilo Ohms
+ 100º C –– 0.1553 Kilo Ohms
CRANK POSITION SENSOR
Assembled on the engine RH cover
The crank position sensor is an inductive pulse generator; the crank sensor scans 23 short
and 1 long protrusion on the alternator. The long protrusion is located at 5º before top dead
center and is used by the powertrain control module as a reference mark for the crank-
shaft position. The crank position sensor sends an alternating voltage signal to the powertrain
control module, which is used to determine engine speed and ignition timing. Thus the
speed of the engine at that instant is known by the ECU.
If the engine runs beyond the maximum rated speed (5500 rpm), the ECU cuts off the fuel
supply to the injector so that the engine will stall and the RPM will reduce to its rated
operating RPM.
This is a safety aspect inbuilt to prevent damage to moving engine parts.
Specification:
Output voltage : 3-5 V AC.
Resisitance : 200 ± 20 Ohms
Function of Components in EMS