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EC-210 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0131, P0151 A/F SENSOR 1 P0131, P0151 A/F SENSOR 1 DTC Logic INFOID:0000000009651069 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 1 FUNCTION With CONSULT 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. 3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication. With GST Follow the procedure “With CONSULT” above. Is the indication constantly approx. 0 V? YES >> Proceed to . NO >> GO TO 3. 3. PERFORM DTC CONFIRMATION PROCEDURE With CONSULT 1. Turn ignition switch OFF, wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF, wait at least 10 seconds and then restart engine. 4. Drive and accelerate vehicle to more than 40 km/h (25 MPH) within 20 seconds after restarting engine. CAUTION: Always drive vehicle at a safe speed. 5. Maintain the following conditions for approximately 20 consecutive seconds. NOTE: 1. 6. Check 1st trip DTC. 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 ENG SPEED 1,000 - 3,200 rpm VHCL SPEED SE More than 40 km/h (25 mph) B/FUEL SCHDL 1.5 - 9.0 msec Selector lever Suitable position |