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Code 23 - Airflow Sensor

NOTE: Refer to illustration for ECM connector terminal identification. See Figure .
  1. Check ECM input signal for airflow sensor. Turn ignition on. Using a DVOM, check voltage between ECM connector terminal B5 (backprobe) and ground. Voltage should be 0-0.3 volt. Check voltage between ECM connector terminal B6 (backprobe) and ground. Voltage should not exist. Check voltage between ECM connector terminal A11 (backprobe) and ground. Voltage should be 10-13 volts.
  2. With engine idling, check voltage between ECM connector terminal B5 and ground. Voltage should be 0.8-1.2 volts. Check voltage between ECM connector terminal B6 and ground. Voltage should not exist. Check voltage between ECM connector terminal A11 and ground. Voltage should be 13-14 volts.
  3. If voltage is as specified in previous steps, check ECM connector terminals for good contact. Repair as necessary. If connector terminals are okay, replace ECM. If voltage is not as specified in previous steps, turn ignition off. Disconnect ECM and airflow sensor connectors.
  4. Using an ohmmeter, check resistance between ECM connector terminal A11 and sensor connector terminal No. 3 (Black/Red wire), between ECM connector terminal B4 and sensor connector terminal No. 1 (Red wire), between ECM connector terminal B5 and sensor connector terminal No. 4 (White wire), and between ECM connector terminal B6 and sensor connector terminal No. 2 (Black wire).
  5. Resistance should be zero ohms for all circuits. If resistance is not as specified, repair appropriate circuit as necessary. If resistance is as specified, replace airflow sensor.
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