Nissan Murano: Dtc/circuit Diagnosis / P1148 Closed Loop Control

Nissan Murano (Z52) 2015-2024 Service Manual / Engine / Engine Control System :: Vq35de / Dtc/circuit Diagnosis / P1148 Closed Loop Control

DTC Description

DTC DETECTION LOGIC

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P1148	CLOSED LOOP-B1 (Closed loop bank 1)	Diagnosis condition	—
		Signal (terminal)	—
		Threshold	The closed loop control function for bank 1 does not operate even when Nissan Murano vehicle is being driven in the specified condition
		Diagnosis delay time	—
P1168	CLOSED LOOP-B2 (Closed loop bank 2)	Diagnosis condition	—
		Signal (terminal)	—
		Threshold	The closed loop control function for bank 2 does not operate even when Nissan Murano vehicle is being driven in the specified condition
		Diagnosis delay time	—

POSSIBLE CAUSE

Harness or connectors

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

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

CHECK DTC PRIORITY

If DTC P1148 or P1168 is displayed with another DTC for A/F sensor 1, perform the trouble diagnosis for the corresponding DTC.

Is applicable DTC detected?

YES>>

Perform diagnosis of applicable. Refer to DTC Index.

NO>>

INSPECTION END

P1078 Evt Control Position Sensor

DTC Description DTC DETECTION LOGICAn excessively high or low voltage from the sensor is sent to ECM. DTC CONSULT screen terms (Trouble diagnosis content) DTC detection condition P1078 EXH TIM SEN/CIRC-B1 [Exhaust valve timing (EVT) control position sensor (bank 1) circuit] Diagnosis condition Start engine and let it idle Signal (terminal) Voltage signal transmitted from EVT control position sensor to ECM Threshold An excessively high or low voltage from the sensor is sent to ECM Diagnosis delay time — P1084 EXH TIM SEN/CIRC-B2 [Exhaust valve timing (EVT) control position sensor (bank 2) circuit] Diagnosis condition Start engine and let it idle Signal (terminal) Voltage signal transmitted from EVT control position sensor to ECM Threshold An excessively high or low voltage from the sensor is sent to ECM Diagnosis delay time — POSSIBLE CAUSEDTC P1078 Harness or connectors [EVT control position sensor (bank 1) circuit is open or shorted...

P1212 Tcs Communication Line

DTC Description DESCRIPTIONThis CAN communication line is used to control the smooth engine operation during the TCS operation. Pulse signals are exchanged between ECM and “ABS actuator and electric unit (control unit)”...

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