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Home >> BMW >> 1990 >> 735i >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Trouble Code Diagnosis >> Trouble Code 07 (Fault Code 1) >> Airflow Meter
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Airflow Meter

  1. Disconnect airflow meter. Turn ignition switch to RUN position. Ensure about 5 volts are present between harness side connector Gray/White wire and ground, Gray/White and Gray/Yellow, and Gray/White and Gray/Blue wires. If voltage is not correct, check continuity of wiring to MCU (in control box at right or left shock tower).
  2. If wiring is okay, replace MCU with a known good unit. If voltage is okay, ensure continuity is present between airflow meter terminal Nos. 2 and 4, and Nos. 2 and 3. If no continuity is indicated, replace airflow meter.
  3. Reconnect wiring harness to airflow meter. Remove wiring harness boot. Connect negative lead of a digital voltmeter to ground. Using the positive lead, carefully backprobe the Gray/Yellow wire on airflow meter.
  4. Check for voltage while opening and closing airflow meter measuring door. If voltage varies between .5 and 4.5 volt, airflow meter is okay, If voltage is not as specified, replace airflow meter.
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