DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms(Trouble diagnosis content)	DTC detection condition
P1148	00	CLOSED LOOP-B1(Closed loop -b1)	Diagnosis condition	-
			Signal (terminal)	-
			Threshold	The closed loop control function does not operate even when vehicle is being driven in the specified condition
			Diagnosis delay time	-

POSSIBLE CAUSE

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

Is applicable DTC detected?

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Perform diagnosis of applicable. Refer to DTC Index .

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INSPECTION END