Three Way Catalytic Converter, TWC Checking
Function
A catalytic converter is a vehicle emissions control device that converts toxic pollutants in exhaust gas to less toxic pollutants by catalyzing a redox reaction (oxidation or reduction). Catalytic converters are used in internal combustion engines.
General recommendations
Observe all safety precautions:
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View clean working conditions:
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Prior to repair work, perform a preliminary check to verify the condition. Refer to
.
Test requirements
- Battery voltage at least 12.5 volts.
- Oxygen sensors OK.
- No leaks or damage to exhaust system.
Function test
| Step |
Procedure |
Result / Action to Take |
| 1 |
Activate Monitors:
- Perform the function test in Diagnostic Mode 06. Refer to appropriate Diagnostic Mode 06 - Read Test Results for Specific Diagnostic Functions,
.
- End diagnosis and switch the ignition off.
- If the specified values are exceeded:
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| 2 |
O2 Sensor Monitoring:
- Erase the DTC memory. Refer to
.
- Perform a road test to verify Repair.
- If the DTC does not return:
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- Generate readiness code. Refer to
.
- If no leaks are found in the exhaust system:
- Replace the catalytic converter with front exhaust pipe. Refer to the appropriate repair information.
- GO TO Step 3 THREE WAY CATALYTIC CONVERTER, TWC CHECKING => 3 .
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| 3 |
- Final procedure:
- Perform a road test to verify repair.
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- After the repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory. Refer to
.
- If necessary, erase the DTC memory. Refer to
.
- If the DTC memory was erased, generate readiness code. Refer to
.
- Return vehicle to Customer.
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