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5-1-1 (Adaptive HO2S Control Provides Leaner Mixture At Idle)

  1. Turn ignition on. Connect voltmeter between Mass Airflow (MAF) sensor connector terminal No. 4 and ground. See Figure . If voltmeter indicates about 2.7 volts, go to next step. If voltage is not to specification, clean MAF sensor connector and repeat test. If still incorrect, repeat test using new MAF sensor.
  2. Check engine oil level and condition and adjust as necessary. If oil level was incorrect or oil was contaminated, clear codes. If oil level and oil condition are okay, check Fuel Evaporative (EVAP) system and repair as necessary. See SYSTEM/COMPONENT TESTS article. If EVAP system is okay, check fuel pressure. See FUEL SYSTEM in the appropriate SPECIFICATIONS article. If fuel pressure is incorrect, repair as necessary and clear codes.
  3. If fuel pressure is correct, check fuel injection ECU signals. See ELECTRONIC CONTROL UNIT - FUEL INJECTION (850) in the appropriate SYSTEM/COMPONENT TESTS article. Clear codes.
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