Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Three Way Catalytic Converter (TWC), Checking



Three Way Catalytic Converter (TWC), Checking

Function test
- Select the "Monitor-ID 33 and 34 ($21 and $22): Catalytic converter monitoring" and check whether the specified values are being reached, Diagnostic mode 6: Check test results of components that are not continuously monitored Diagnostic Mode 06 - Read Test Results For Specific Diagnostic Functions
- End diagnosis and switch ignition off.

If specified value is not obtained:
- Replace catalytic converters and front muffler.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes