Pressure Test Point
On some applications there is a pressure test point with a Schrader fitting in the fuel rail that relieves the fuel pressure and measures the fuel injector supply pressure for repair and diagnostic procedures. Before repairing or diagnosing the fuel system, read any WARNING, CAUTION, and HANDLING information. On vehicles not equipped with a Schrader valve, use the Rotunda Fuel Pressure Test Kit 134-R0087 or equivalent.
Low Idle Airflow Test
When the cold start emission reduction monitor is enabled, the idle air control system requests a higher RPM, elevating engine airflow. While this cold start emission reduction elevated airflow is requested, the low airflow test compares the measured idle airflow from the mass air flow (MAF) sensor to the commanded idle air control strategy. For the purpose of detecting low airflow failures, the low airflow test uses the measured airflow and the commanded airflow to create a low airflow index.
Cold start emission reduction typical spark timing test entry conditions
- DTC: P050B cold start ignition timing performance
- Monitor execution: Once per driving cycle, from startup with cold start emission reduction monitor active
- Monitor sequence: none
- Monitoring duration: 7 seconds
- Minimum entry condition: 400 RPM
- Maximum entry condition: 2,000 RPM
Cold start emission reduction typical spark timing test malfunction thresholds
- Spark advanced from desired is greater than 5 degrees
- Malfunction present for 4 seconds