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 O2 Sensor or engine misfire faults.
- Set Condition: The amplitude of the O2 Sensor Signal downstream of the TWC exceeds 75% of the amplitude of the O2 Sensor Signal upstream of the TWC for approximately 170 seconds.





For a complete Powertrain Control Module Circuit Diagram, Schematics and Diagrams.

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 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.Catalytic Converter - Removal.
- Perform POWERTRAIN VERIFICATION TEST - VER 2. Powertrain Verification Test

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. Powertrain Verification Test

No

- Replace the TWC converter. Catalytic Converter - Removal.
- Perform POWERTRAIN VERIFICATION TEST - VER 2. Powertrain Verification Test