Pinpoint Test Hf: Catalyst Efficiency Monitor And Exhaust Systems
Normal Operation and Fault Conditions
Refer to the DTC Fault Trigger Conditions.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| PCM P0420:00 | Catalyst System Efficiency Below Threshold (Bank 1): No Sub Type Information | Sets when PCM detects the bank 1 catalyst system efficiency is below the acceptable threshold. Under normal closed loop fuel conditions, high efficiency catalysts have oxygen storage capability. As catalyst efficiency deteriorates, its ability to store oxygen declines. Refer to Catalyst Efficiency Monitor description for additional information. Diagnose any base engine concerns. Refer to ENGINE |
| PCM P0430:00 | Catalyst System Efficiency Below Threshold (Bank 2): No Sub Type Information | Sets when PCM detects the bank 2 catalyst system efficiency is below the acceptable threshold. Under normal closed loop fuel conditions, high efficiency catalysts have oxygen storage capability. As catalyst efficiency deteriorates, its ability to store oxygen declines. Refer Catalyst Efficiency Monitor description for additional information. Diagnose any base engine concerns. Refer to ENGINE |
Possible Sources
- HO2S2WD4WD circuitry concern
- Exhaust system concern
- Contaminated oil
- Base engine concern
- Fuel injector
- Turbocharger
- HO2S
For testing procedures refer to PINPOINT TESTS HF: CATALYST EFFICIENCY MONITOR AND EXHAUST SYSTEMS