16474/P0090/000144

Possible Symptoms

• MIL (Malfunction Indicator Lamp) ON
• Loss of power (limp mode) possible
• Difficulty starting engine (extended cranking or no start)
• Increased emissions
• DTC stored in ECM

Possible Causes

• Open circuit in wiring to Valve for Fuel Metering -N290-
• Faulty Valve for Fuel Metering -N290-
• Faulty Fuel Pressure Regulator Valve -N276-
• Poor electrical connections (loose, corroded, or damaged pins)
• ECM power stage fault

Possible Solutions

• Check wiring and connectors to Valve for Fuel Metering -N290-
• Check Fuel Pressure Regulator Valve -N276-
• Repair or replace wiring/connectors as necessary
• Replace faulty Valve for Fuel Metering -N290- or Fuel Pressure Regulator Valve -N276-
• If no fault is found in wiring or components, suspect ECM internal fault
• Measure resistance between component connector terminals 1 and 2
  • Specified value: 1.5 – 11 Ω (±0.5 Ω @ ~20 °C) (verify ALL values with official repair information!)

Monitoring Conditions

• Signal voltage < 4.70 V
• Power stage = permanently high
• Duration ≥ 0.20 sec.
• Continuous / 2 DCY

Special Notes

• The Fuel Metering Valve -N290- and Fuel Pressure Regulator Valve -N276- may be referenced differently depending on engine family.
• Always verify wiring integrity before replacing components.