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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Engine Control System (DTC/Circuit Diagnosis) (VQ35DE) (Except Hybrid) (2 Of 3)) >> DTC/Circuit Diagnosis >> DTC P1148, P1168: Closed Loop Control >> DTC Logic >> DTC Detection Logic

DTC Detection Logic

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

DTC P1148 or P1168 is displayed with another DTC for A/F sensor 1. 

Perform the trouble diagnosis for the corresponding DTC. 

DTC No. CONSULT screen terms
(Trouble diagnosis content)		 DTC detecting condition Possible cause
P1148 CLOSED LOOP-B1
(Closed loop bank 1)		 The closed loop control function for bank 1 does not operate even when vehicle is being driven in the specified condition.
  • Harness or connectors

    (The A/F sensor 1 circuit is open or shorted.)

  • A/F sensor 1
  • A/F sensor 1 heater
P1168 CLOSED LOOP-B2
(Closed loop bank 2)		 The closed loop control function for bank 2 does not operate even when vehicle is being driven in the specified condition.
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