LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2002 >> G20 Automatic, RE4F03W >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - G20 >> Diagnostic Tests >> DTC P1148: Closed Loop Control >> DTC Confirmation Test (Using CONSULT-II)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 HO2S1 (B1) 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 4 minutes. Maintain the following conditions for at least 50 consecutive seconds:
    • B/FUEL SCHDL: more than 2.4 msec.
    • ENG SPEED: more than 1500 RPM.
    • VHCL SPEED SE: more than 44 MPH.
    NOTE: DTC P0130 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.

scientia non olet · About LEMON Manuals