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P0131, P0151 A/F SENSOR 1 EC-201 < COMPONENT DIAGNOSIS > [VQ37VHR] C D E F G H I J K L M A EC N P O P0131, P0151 A/F SENSOR 1 Description INFOID:0000000001910853 The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen- Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this ° C (1,472 ° F). DTC Logic INFOID:0000000001734037 DTC DETECTION LOGIC To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1 DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION: >> GO TO 2. 2. CHECK A/F SENSOR FUNCTION With CONSULT-III 1. Start engine and warm it up to normal operating temperature. 2. Select “A/F SEN1 (B1)” or “A/F SEN1 (B2)” in “DATA MONITOR” mode with CONSULT-III. 3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication. JMBIA0112GB PBIB3354E DTC No. Trouble diagnosis name DTC detecting condition Possible Cause P0131 Air fuel ratio (A/F) sensor 1 • The A/F signal computed by ECM from the A/ F sensor 1 signal is constantly approx. 0V. • Harness or connectors (The A/F sensor 1 circuit is open or • A/F sensor 1 P0151 Air fuel ratio (A/F) sensor 1 |