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Home >> Mercedes Benz >> 1990 >> 560SEC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Airflow Sensor Position Indicator Test
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Airflow Sensor Position Indicator Test

  1. Loosen plug of airflow sensor position indicator to permit measuring of voltage at pins (do not disconnect plug). Start engine. Voltage at terminal Nos. 1 and 3 should be 4.5-5.5 volts. Voltage at terminal Nos. 1 and 2 should be .5-1.5 volts. If okay, go to next step. If voltage is not as specified, go to step 3).
  2. Stop engine and turn on ignition. Slowly deflect airflow sensor plate. Measure voltage between terminal Nos. 1 and 2. Voltage should increase steadily to 4.5-5.5 volts. If voltage is not to specification, replace airflow sensor. If okay, test is complete.
  3. Stop engine. Check wires between airflow sensor position indicator and CIS-E control unit plug for continuity. Check wires for correct routing. Resistance should be zero ohms. If okay, go to next step. If not okay, repair open circuit.
  4. Start engine and run at idle speed (engine at operating temperature). Check on-off ratio at diagnostic socket (located on left side of engine compartment). Tester needle should oscillate. If needle does not oscillate, check diagnostic socket. If okay, test is complete.
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