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Home >> Audi >> 1987 >> 5000 CS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> BOSCH Cis-E System >> Operation >> Fuel Supply >> Altitude Correction
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Altitude Correction

Injection control is influenced by altitude. With ignition switched on or with engine running, altitude sensor will receive constant voltage signal of approximately 8 volts from ECU. As altitude increases (air pressure decreases), the signal from the ECU reduces current to the differential pressure regulator. This leans out the fuel mixture.