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Code 23 - Airflow Sensor

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