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P0131, P0151 A/F SENSOR 1 EC-809 < DTC/CIRCUIT DIAGNOSIS > [VK50VE] C D E F G H I J K L M A EC N P O P0131, P0151 A/F SENSOR 1 Description INFOID:0000000005237295 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:0000000005237296 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 procedure 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. 0 V. • Harness or connectors (The A/F sensor 1 circuit is open or • A/F sensor 1 P0151 Air fuel ratio (A/F) sensor 1 |