Page 93 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 3.7: Check catalytic converter

Objectives

At the end of this exercise you shall be able to
• test a catalytic converter.

Requirements

Tools/Equipments/Materials
• A running condition vehicle with catalytic converter
• Scan tool
• Infrared thermometer

Procedure

• Confirm the catalytic converter is cool.

• Strike the converter housing with a rubber hammer.
• If you found any rattle noise, then converter has internal damage such as loose catalyst, screens or baffles.
• Connect the scan tool with the vehicle.
• Check the waveform of oxygen sensor.
• This will show the whether the catalytic converter is working properly or not.

• Obtain a infrared thermometer.
• Run the engine for 5 minutes or till it reaches normal operating temperature.
• Place the thermometer at the front and rear of the converter and note down the values.
• Turn off the engine.
• There should be temperature difference in between these two and the temperature of the rear should not be
greater than the front. If not, decide problem is with the catalytic converter.

Fig 1

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