Fuel System Monitoring

Fuel System Monitoring

Description
This diagnostic monitors the long-term adaptions of the fuel system. If these exceed calibrated thresholds for a calibratable time then an appropriate DTC will be recorded.

This monitor operates continuously provided the entry conditions have been met. Any of the components that make up the fuel system that are individually monitored, like the exhaust gas oxygen sensors, fuel pressure sensor and fuel delivery system, must also themselves be in working order with no faults. The general operation of the monitor is shown below.

Strategy Flowchart








If the above table does not include details of the following enabling conditions: - IAT, ECT, vehicle speed range, and time after engine start-up then the state of these parameters has no influence upon the execution of the monitor.

Drive Cycle Information
1. Start engine and bring to normal operating temperature > 82 degrees C (180 degrees F).
2. Idle for a minimum of 10 minutes.