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Home › Nissan-Datsun › 2004 › Xterra SE, 4WD › Repair and Diagnosis › Engine Performance › System › Engine Control System - VG33E › DTC P1148, P1168: Closed Loop Control › Overall Function Check › With GST

With GST

  1. Start engine and warm it up to normal operating temperature.
  2. Set voltmeter probes between ECM terminal 50 [HO2S1 (B1) signal] or 51 [HO2S1 (B2) signal] and engine ground.
  3. Check the following with engine speed held at 2, 00 RPM constant under no load.
    • The voltage should go above 0.70V at least once.
    • The voltage should go below 0.21V at least once.
  4. If NG, go to Diagnostic Procedure  .
    Fig 1: Setting Voltmeter Probes Between ECM Terminal 50 & 51
    G00870648Courtesy of NISSAN MOTOR CO., U.S.A.
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