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Home >> Mercedes Benz >> 1986 >> 560SL >> Repair and Diagnosis >> Engine Performance >> System >> Cis-E System >> Diagnostic Testing >> Test 5 >> Testing Airflow Sensor Position Indicator
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Testing Airflow Sensor Position Indicator

  1. Loosen plug of airflow sensor position indicator so that the voltage can be measured at the pins (do not disconnect plug). Start engine. Voltage at terminals No. 1-3 should be 4.5-5.5 volts. Voltage at terminals No. 1-2 should be .5-1.5 volts. If not okay, go to step 3). If okay, go to step 2).
  2. Stop engine and turn on ignition. Slowly deflect airflow sensor plate. Measure voltage between terminals No. 1 and 2. Voltage should increase continuously to 4.5-5.5 volts. If not okay, 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 wire routing according to wiring diagram. Resistance should be about zero ohms. If not okay, repair interruption. If okay, go to step 4).
  4. Start engine. Run at idle speed (engine at operating temperature). Check on-off ratio at diagnostic socket. Tester needle should oscillate. If not okay, replace CIS-E control unit if necessary. If okay, test is complete.
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