Page 294 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

MODULE 16: Engine Management System

EXERCISE 16.1: Perform onboard diagnosis on engine and

emission control system

Objectives
At the end of this exercise you shall be able to
• detect the engine malfunction by mil lamp and svs light
• carry out step by step diagnostic procedure on engine and emission control system.

Requirements

Tools/Equipments Materials

• Trainee’s toolkit - 1 No. • Diesel - as reqd.
Equipments/Machines • Coolant - as reqd.
• Engine oil - as reqd.
• Scan tool - 1 No. • Cotton cloth - as reqd.
• A light motor vehicle with CRDI
engine - 1 No.

Procedure

TASK 1: Detect the engine malfunction by MIL lamp and SVS light
Check operation of malfunction Indication Lamp (MIL)
1 Turn ON the vehicle Ignition key into Ignition ON position and engine OFF condition.
2 Observe the engine cluster for MIL lamp ON. If MIL lamp does not turn ON, Check the MIL lamp and its
circuits.
3 Start Engine and observe the engine cluster for MIL lamp turns OFF, If MIL continuously ON it indicates some
troubles in Engine control system which affects vehicle emission and Diagnostic trouble code is stored in ECM
memory.
Check operation of Service Vehicle Soon light (SVS)
1 Turn ON the vehicle Ignition key into Ignition ON position and engine OFF condition

2 Observe the engine cluster for SVS lamp Turns ON for 4 seconds then it Turns OFF If SVS lamp does not turn
ON, Check the SVS lamp and its circuits. If SVS Light flashes there is some troubles in Immobilizer control.
If SVS light continuously ON it indicates some troubles in engine control system but it does not affect vehicle
emissions.

TASK 2: Step by Step diagnostic procedure on engine and emission control system

Step 1: Customer complaint Analysis
Collect the details of vehicle problems, how it is occurred, when it is started ,Vehicle condition and kind of
symptoms and record it.
Step 2: DTC record and clearance

Connect scan tool to DLC , read DTC and Freeze frame data.
Take a print out and Clear DTC. If DTC is not cleared problem persists on engine continue the next step.

277