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Home >> Infiniti >> 2005 >> Q45 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0441 To P1168 >> DTC P1148, P1168: Closed Loop Control >> 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 16 [HO2S1 (B1) signal] or 35 [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 0.21V at least once.
  4. If NG, go to "DIAGNOSTIC PROCEDURE ".
    Fig 1: Checking Voltage Between ECM Terminal 16 [HO2S1 (B1) Signal] Or 35 [HO2S1 (B2) Signal] And Ground
    G02376023Courtesy of NISSAN MOTOR CO., U.S.A.
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