Test Group TBM2.8VJGKEK
Fuel System Monitoring General Description - Fuel system monitoring includes lambda controller restriction against limits for rich and lean and permanent deviation from mean position.
- Monitoring Structure - If fuel system is suddenly hard disturbed and lambda controller reaches restriction (lean limit), a timer is started. Timer is incriminated as long as controller remains at limit. If it exceeds a predetermined value, a fault for short trim will be detected and stored for rich and lean exceeding separately. For permanent deviation from mean position, there are additional lean and rich thresholds. If accumulated time (sum of all excesses for rich or lean) is greater than a fixed limit during a defined period, a fault for long term trim will be detected and stored for rich and lean exceeding separately.
- Monitoring Conditions - For monitoring conditions during closed loop, see Fig 1.