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Home >> Infiniti >> 2003 >> QX4 RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1148: Bank 1 Closed Loop Control Not Obtained Or DTC P1168: Bank 2 Closed Loop Control Not Obtained >> DTC Confirmation Test (Using CONSULT-II)

DTC Confirmation Test (Using CONSULT-II)

  1. Start engine and warm to normal operating temperature. Select DATA MONITOR mode with CONSULT-II. While holding engine speed at 2000 RPM, observe HO2S 1 (B1)/(B2) voltage with CONSULT-II. Voltage should go above .70 volt at least once. Voltage should go below .21 volt at least once. If voltage is as specified, go to next step. If voltage is not as specified, go to DIAGNOSTIC PROCEDURE .
  2. Let engine idle for at least 5 minutes. Maintain the following conditions for at least 50 consecutive seconds:
    • B/FUEL SCHDL: 3.6 msec or more.
    • ENG SPEED: 1500 RPM or more.
    • VHCL SPEED SE: more than 43 MPH.
    NOTE: DTC P0134 and/or P0154 may be displayed on CONSULT-II during this test.

    If DTC is detected, go to DIAGNOSTIC PROCEDURE . If DTC is not detected, system is okay at this time.

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