Page 178 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 9.6: Perform testing of Actuators

Objectives

At the end of this exercise you shall be able to
• test the Fuel pump relay and Radiator fan relay
• test the EGR valve
• test the Fuel injector.
Requirements

Tools/Instruments Equipments/Machines

• Trainees tool kit - 1 No. • A light motor vehicle with CRDI Engine - 1 No.
• Multimeter - 1 No. Materials
• Fuel injector leak measuring pipes - as reqd. • Tray - 1 No.
• Scan Tool - 1 No. • Banian cloth - 1 No.
• Oscilloscope 20 MHZ - 1 No. • 12V battery - 1 No.

Procedure

Test the fuel pump relay

1 Turn off the Ignition key.
2 Connect the scan tool to DLC and Turn On Ignition switch.
3 Check the fuel pump operating sound is heard by actuating the scan tool actuation test. If the sound is not
heard, go to the next step.

4 Turn the Ignition switch off and Remove the fuel pump relay from fuse box.
5 Check the continuity between terminal ‘3’ an ‘4’. If there is continuity shows replace the Relay.
6 Connect a battery positive terminal to terminal ‘2’ of relay. Connect battery negative terminal to terminal 1 of
relay. Check for continuity between Terminal “3” and “4”. If there is no continuity when relay is connected to
the battery, replace relay.
Test the Radiator Fan relay

1 Turn off the Ignition key.
2 Connect the scan tool to DLC and Turn On Ignition switch.
3 Turn ignition switch ON.
4 Check the cooling fan operates at low speed by using actuating the scan tool actuation test. If it is not
working, go to the next step.
5 Check the cooling fan operates at high speed by using actuating the scan tool actuation test. If it is not
working, go to the next step.

6 Turn the Ignition switch off and Remove the cooling fan relay from fuse box.
7 Check the continuity between terminal ‘3’ an ‘4’. If there is continuity shows replace the Relay.
8 Connect a battery positive terminal to terminal ‘2’ of relay. Connect battery negative terminal to terminal “1 “of
relay. Check for continuity between Terminal “3” and “4”. If there is no continuity when relay is connected to
the battery, replace relay.

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