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Home >> Infiniti >> 2004 >> I35 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> DTC P1144 & DTC P1164: Ho2S1 >> Overall Function Check >> With GST
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With GST

  1. Start engine and warm it up to normal operating temperature.
  2. Set voltmeter probes between ECM terminal 91 (HO2S1 bank 1 signal) or 92 (HO2S1 bank 2 signal) and engine ground.
    Fig 1: Checking Heated Oxygen Sensor 1 Circuit Overall Function
    G00787099Courtesy of NISSAN MOTOR CO., U.S.A.
  3. Check one of the following with engine speed held at 2,000 rpm constant under no load.
    • The maximum voltage is below 0.8V at least one time.
    • The minimum voltage is below 0.35V at least one time.
  4. If NG, go to DIAGNOSTIC PROCEDURE  .
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