Catalytic Converter: Testing and Inspection

Catalytic Converter, Checking

Observe all safety precautions: => [ Safety Precautions ] Safety Precautions

View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions

Prior to repair work, perform a preliminary check to verify the condition. Refer to => [ Preliminary Check ] Preliminary Check.

Special tools, testers and auxiliary items required

• Generic scan tool

Test requirements

• Battery voltage at least 12.5 volts

• No leaks or damage to the exhaust system.

• Oxygen sensor OK

Test procedure

- Perform the function test in Diagnostic Mode 06. Refer to => [ Diagnostic Mode 06 - Read Test Results for Specific Diagnostic Functions ] Scan Tool Testing and Procedures.

If the specified values are exceeded:

- Check the exhaust system for leaks.

- Repair as necessary.

If no leaks are found in the exhaust system, no O2 sensor codes set and DTC P0420 is set:

- Replace the catalytic converter. Refer to the service manual for removal and installation procedures.

Final procedures

After repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Scan Tool Testing and Procedures.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Scan Tool Testing and Procedures.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.