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(P0432) CATALYTIC 2/1 EFFICIENCY (CONTINUED) When Monitored and Set Condition • When Monitored: The Powertrain Control Module (PCM) monitors the engine at operating temperature, in • Set Condition: The amplitude of the O2 Sensor Signal downstream of the TWC exceeds 75% of the amplitude POSSIBLE CAUSES O2 SENSOR CONTAMINATION ENGINE EXHAUST LEAKS OR DAMAGE THREE WAY CATALYTIC CONVERTER FAILURE THREE WAY CATALYTIC CONVERTER DAMAGE For a complete Powertrain Control Module Circuit Diagram, (Refer to 9 - ENGINE - SCHEMATICS AND DIA- Diagnostic Test 1. INSPECT THE THREE WAY CATALYTIC CONVERTER Note: Diagnose any O2 Sensor DTC(s) before continuing with this diagnosis. Note: Check for contaminants that may have damaged the O2 Sensor and TWC converter: contaminated Note: Engine exhaust leaks can be the cause of this DTC. Inspect the exhaust system for leaks before diag- Note: Always perform diagnostics with a fully charged battery. Inspect the TWC for the following damage • Dents or holes. • Severe discoloration caused by overheating the TWC. • TWC broken internally. • Leaking TWC. Did you find any of the above conditions? Yes >> Repair the condition that caused the failure and replace the TWC converter.(Refer to 11 - EXHAUST SYSTEM/CATALYTIC CONVERTER - REMOVAL). Perform POWERTRAIN VERIFICATION TEST - VER 2. No >> Go To 2 2. INSPECT FOR EXHAUST LEAKS Inspect the exhaust for any leak between the engine and the O2 Sensors. Are there any exhaust leaks? Yes >> Repair or replace the leaking exhaust parts as necessary. Perform POWERTRAIN VERIFICATION TEST - VER 2. No >> Replace the TWC converter. (Refer to 11 - EXHAUST SYSTEM/CATALYTIC CONVERTER - REMOVAL). Perform POWERTRAIN VERIFICATION TEST - VER 2. ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 445 |