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Home >> Buick >> 1987 >> Skyhawk Sport, 2.0 1, Standard >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L PFI Tests >> Diagnostic Code Flow Charts >> Code 44, Lean Exhaust Indication >> Notes

Code 44, Lean Exhaust Indication: Notes

Code 44 indicates that the ECM has seen O2 sensor voltage (at ECM terminal "E14") lower than .2 volts for 50 seconds or more, one minute after engine start. The ECM supplies a voltage of about .45 volt between terminals "E14" and "E15". The O2 sensor varies the voltage from one volt (rich indication) to .10 volt (lean indication). An open sensor circuit or a bad sensor causes open loop operation.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. This test allows ECM to confirm conditions for Code 44.
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