P0432

(P0432) CATALYTIC 2/1 EFFICIENCY






When Monitored and Set Condition
^ When Monitored: The Powertrain Control Module (PCM) monitors the engine at operating temperature, in closed loop, engine load between 22-52%, the Three Way Catalytic (TWC) converter temperature is greater than 380 °C (716 °F), and no 02 Sensor or engine misfire faults.
^ Set Condition: The amplitude of the 02 Sensor Signal downstream of the TWC exceeds 75% of the amplitude of the 02 Sensor Signal upstream of the TWC for approximately 170 seconds.

POSSIBLE CAUSES
02 SENSOR CONTAMINATION
ENGINE EXHAUST LEAKS OR DAMAGE
THREE WAY CATALYTIC CONVERTER FAILURE
THREE WAY CATALYTIC CONVERTER DAMAGE

Diagnostic Test
1. INSPECT THE THREE WAY CATALYTIC CONVERTER

Note: Diagnose any 02 Sensor DTC(s) before continuing with this diagnosis.

Note: Check for contaminants that may have damaged the 02 Sensor and TWC converter: contaminated fuel, unapproved silicone products, oil or coolant and repair as necessary.

Note: Engine exhaust leaks can be the cause of this DTC. Inspect the exhaust system for leaks before diagnosing this DTC.

Note: Always perform diagnostics with a fully charged battery.

Turn the ignition off.
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.
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 02 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.
Perform Powertrain Verification Test - Ver 2