Nissan Sentra Service Manual: P1148 Closed loop control

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P1148 Closed loop control

DTC Logic

DTC DETECTION LOGIC

NOTE:

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

When the DTC is detected, perform the trouble diagnosis of DTC corresponding to A/F sensor 1.

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detecting condition	Possible cause
P1148	CLOSED LOOP-B1 (CLOSED LOOP-B1)	The closed loop control function does not operate even when vehicle is being driven in the specified condition.	Harness or connectors (A/F sensor 1 circuit is open or shorted.) A/F sensor 1 A/F sensor 1 heater

Diagnosis Procedure

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

When the DTC is detected, perform the trouble diagnosis of DTC corresponding to A/F sensor 1.

Refer to EC-94, "DTC Index".

P1078 EVT Control position sensor

DTC Logic DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P1078 EXH TIM SEN/CIRC-B1 (Exhaust val ...

P117A AIR Fuel ratio

DTC Logic DTC DETECTION LOGIC NOTE: If DTC P117A is displayed with other DTC, first perform the trouble diagnosis for the other DTC. Refer to EC-94, "DTC Index". DTC No. CON ...

Other materials:

P0078 EVT Control solenoid valve
DTC Logic DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P0078 EX V/T ACT/CIRC-B1 (Exhaust valve control solenoid circuit bank 1) An improper voltage is sent to the ECM through exhaust v ...

Engine block heater (if so equipped)
Engine block heaters are used to assist with cold temperature starting. The engine block heater should be used when the outside temperature is 20°F (-7°C) or lower. WARNING Do not use your engine block heater with an ungrounded electrical system or a 2-pronged adapter. You ...

Windshield wiper and washer switch
Switch operation Type A Type B The windshield wiper and washer operates when the ignition switch is placed in the ON position. Push the lever down to operate the wiper at the following speed: Intermittent (INT) — intermittent operation can be adjusted by turning the knob A . Lo ...