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Home >> Nissan-Datsun >> 1983 >> Sentra Base, 2D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Air/Fuel Ratio Control System >> System Testing >> System Check
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System Check

  1. Visually check air/fuel ratio system. Check all hoses and electrical connections for proper installation. Start engine and warm to normal operating temperature.
  2. Connect voltmeter positive lead to Green/Blue wire. Connect negative lead to Black wire at function check connector (located under left side of instrument panel).
  3. Coolant temperature switch functions properly if voltmeter reads 0 volts when coolant temperature is below 104°F (40°C) or 12 volts if above.
  4. Disconnect air/fuel ratio control solenoid valve connector. With engine running at 2000 RPM, apply 12 volts to valve. If valve is operating properly, a clicking sound can be heard from valve and engine speed will change. If not, replace air/fuel ratio control solenoid valve.
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