DTC DETECTION LOGIC

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.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1148
Closed loop control function (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 control function (bank 2)
The closed loop control function for bank 2 does not operate even when vehicle is being driven in the specified condition.