P0091

Описание

Valve for Fuel Metering (N290), Short to Ground

Частые симптомы

• Fuel metering system inoperative
• Check Engine Light
• Possible default fuel delivery mode
• Reduced engine performance
• Possible starting issues

Возможные причины

• Direct short to ground in metering valve circuit
• Failed metering valve with internal short
• Damaged wiring harness shorting to chassis
• Corroded connections causing ground short
• ECU driver circuit ground fault

Диагностика

1. 1. Check for direct shorts to ground in metering circuit
2. 2. Test metering valve internal resistance
3. 3. Inspect wiring harness for damage
4. 4. Check all connections for corrosion
5. 5. Test ECU driver circuit isolation

Решения по ремонту

• Repair direct short to ground in wiring
• Replace metering valve with internal short
• Repair damaged wiring harness
• Clean or replace corroded connections
• Replace ECU if driver circuit has ground fault

Профилактика

• Protect fuel system wiring from abrasion
• Regular electrical insulation checks
• Address electrical issues promptly