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Home › Nissan-Datsun › 2004 › Altima Base, Automatic › Repair and Diagnosis › External Pages › Different variant/trim › Section 5 (Engine Control System - 3.5L) › DTC P1148, P1168: Closed Loop Control › Overall Function Check › With GST

With GST

WARNING: This page is about a different variant/trim than selected.
  1. Start engine and warm it up to normal operating temperature.
  2. Set voltmeter probes between ECM terminal 91 [HO2S1 (B1) signal] or 92 [HO2S1 (B2) signal] and ground.
  3. Check the following with engine speed held at 2, 000 RPM constant under no-load.
    • The voltage should go above 0.70V at least once.
    • The voltage should go below 0.21 V at least once.
  4. If NG, go to "DIAGNOSTIC PROCEDURE ".
    Fig 1: Checking Voltage Between Terminal 91 Or 92 And Ground
    G02885810Courtesy of NISSAN MOTOR CO., U.S.A.
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