Page 298 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 16.3: Perform testing of sensors

Objectives

At the end of this exercise you shall be able to
• test the temperature sensor
• test the pressure sensor
• test the potentiometer
• crankshaft position sensor
• test the camshaft sensor.
Requirements

Tools/Equipments Materials

• Trainee’s toolkit - 1 No. • Tray - 1 No.
• Multi Meter - 1 No. • Banian cloth - 1 No.
• Thermometer 0-100◦C - 1 No. • 12 V Lead acid battery - 1 No.
• Air drier portable - 1 No. • 1.5V batteries - 3 Nos
Machines
• A light motor vehicle with CRDI
engine - 1 No.
Procedure

TASK 1: Checking of engine coolant Temperature sensor (Fig 1)

Fig 1

1 First open the bonnet by removing the lock.
2 Locate the temperature sensor, mostly it is located in the thermostat valve region.
3 Set the multi meter in the resistance measuring mode.

4 Ground the black terminal, connect the red terminal to the temperature sensor, measure the resistance.
5 Turn the engine on, run for two to three minutes to warm up the engine.
6 Now measure the resistance with the same procedure.
7 If the difference in resistance is more than 200 ohms the sensor is in good condition.
8 If the difference is not more than 200 ohms. Replace the temperature sensor.

281

CITS : Automotive - Mechanic Diesel - Exercise 16.2