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944 Turbo Model

  1. Loosen and fold down control unit bracket in passenger side kick panel. Pull out and remove plug connector on DME control unit. Remove upper section of plug connector, cutting cable band and removing fastening screw. Pull plug upper section away lengthwise.
  2. Check supply voltage of airflow sensor. Connect voltmeter to terminals No. 9 and 5 (ground) on reverse side of control unit. Nominal value should be about 5 volts.
  3. Remove air filter and connect voltmeter to terminals No. 7 and 5 (ground) on control unit plug. Check voltage drop on airflow sensor. Nominal voltage should be about 250-260 mV.
  4. Push air flap to full load through air intake opening. Nominal value should be about 4.6 volts. Check temperature sensor (NTC 1 intake air temperature). Connect terminals No. 22 and 6 on the pulled control unit plug. Using ohmmeter, measure ohm resistance. Nominal value should be 1.4-3.6 ohms at 59-86°F (15-30°C) and 1-1.3 ohms at about 104°F (40°C).
    NOTE: Break on temperature sensor causes richer mixture. Short circuit on temperature sensor causes leaner mixture.
  5. Repair or replace components as necessary. To install, reverse removal procedure.
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