Emission Control Systems: Testing and Inspection

Three Way Catalytic Converter, Checking

Test requirements

• Battery voltage at least 12.5 volts.

• Oxygen Sensors OK.

• No leaks or damage to exhaust system.

Function test

- Perform the function test in Diagnostic Mode 06. Refer to => [ Diagnostic Mode 06 - Read Test Results for Specific Diagnostic Functions ] Diagnostic Modes 01 - 09.

- Switch the ignition Off.

If the specified values are exceeded:

- Check the exhaust system for leaks.

- If necessary, repair the leak in the exhaust system.

- Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

- Perform a road test to verify Repair.

If the DTC does not return:

Generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

If no leaks are found in the exhaust system:

- Replace the catalytic converter including front exhaust pipe. Refer to the Repair Information.

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 ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

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