Fuel Shut-Off: Notes

Fig 1: Diagnosis For Fuel Shut-Off In Injector

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fuel shut-off will take place if any of the following criteria are fulfilled:

• +15 supply missing
• fully depressed accelerator pedal during starter motor cranking
• engine speed above (depending on coolant temp.):
  • engine coolant temperature <60° - over 6300 rpm
  • engine coolant temperature >80° - over 6400 rpm
• air mass/combustion above:
  • B235E: above 1100 mg/c
  • B235R: above 1350 mg/c
• immobilizer code incorrect
• throttle rotated manually while engine running
• major fault in throttle control
• in case of a pedal sensor malfunction if the engine speed exceeds 2200 rpm
• ignition discharge module not powered
• engine speed above 1600 rpm, accelerator pedal fully released and coolant temperature exceeds 20°C. This applies in 3rd, 4th and 5th gears on cars with manual gearbox and in 2nd, 3rd and 4th gears on cars with automatic transmission. Injection starts again at 1250 rpm.