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Home >> Infiniti >> 2003 >> Q45 >> Repair and Diagnosis >> External Pages >> Different car >> Section 201 (Engine Control System) >> DTC P1144, P1164: Ho2S1 >> Overall Function Check >> With GST
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With GST

WARNING: This page is about a different car, the 2004 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.
  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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