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Code 3-2-2 (Airflow Meter Hot Wire)

  1. Approximately 4 volts is routed to platinum wire in airflow meter from ECU terminal No. 5. Ground is supplied from ECU terminal No. 7. Fault code is set if voltage between ground and terminal No. 7 does not exceed 2.5 volts.
  2. Turn ignition off. Connect Measuring Unit (999-3070 ) to ECU. See CONNECTING MEASURING UNIT TO ECU  . To ensure airflow meter is grounded, connect ohmmeter between terminals No. 19 and 26. Zero ohms should be present. Connect ohmmeter between airflow meter connector terminal No. 1 (Brown wire) and ground. Reading should be about zero ohms.
  3. Connect ohmmeter between terminals No. 7 and 26. Reading should be about 2.5-4.0 ohms. If resistance is not to specification, measure resistance between airflow meter terminals No. 2 (Brown/White wire) and 3 (Green/Yellow wire).
  4. Turn ignition on. Connect voltmeter between terminals No. 7 and 19. About 1.4 volts should be present. Start engine. Voltage should increase to 2.3-2.6 volts when idling. Voltage should be 2.3 volts with engine hot.
  5. If voltage reading is too low, connect voltmeter between terminals No. 25 and 19. Increase speed to 1800 RPM, and stop engine. Voltage should be about 4 volts. On A/T models, check test mode No. 1 if load signal fault code is displayed. See TEST MODE NO. 1 under RETRIEVING CODES  .
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