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Home >> Infiniti >> 2004 >> Q45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P1144, 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 114 [HO2S1(B1) signal] 115 [HO2S1(B2) signal] and ground.
  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 1 time.
    • The minimum voltage is below 0.35V at least 1 time.
  4. If NG, go to DIAGNOSTIC PROCEDURE  .
    Fig 1: Checking Voltages Between ECM Terminal 114 [HO2S1(B1) Signal] 115 [HO2S1(B2) Signal] & Ground
    G00760605Courtesy of NISSAN MOTOR CO., U.S.A.
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