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EC-214 < DTC/CIRCUIT DIAGNOSIS > [HR16DE] P0131 A/F SENSOR 1 P0131 A/F SENSOR 1 DTC Logic INFOID:0000000009020731 DTC DETECTION LOGIC To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1 signal is not inordinately low. DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test. 1. 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: Before performing the following procedure, confirm that battery voltage is more than 10.5 V at idle. >> GO TO 2. 2. CHECK A/F SENSOR FUNCTION 1. Start engine and warm it up to normal operating temperature. 2. Select “ENGINE” using CONSULT. 3. Select “A/F SEN1 (B1)” in “DATA MONITOR” mode. 4. Check “A/F SEN1 (B1)” indication. YES >> Go to NO >> GO TO 3. 3. PERFORM DTC CONFIRMATION PROCEDURE 1. Turn ignition switch OFF and wait at least 10 seconds and then restart engine. 2. 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. 3. Maintain the following conditions for about 20 consecutive seconds. NOTE: • Keep the accelerator pedal as steady as possible during cruising. • If this procedure is not completed within 1 minute after restarting engine at step 1, return to step 1. 4. Check 1st trip DTC. YES >> Go to NO >> INSPECTION END DTC No. Trouble diagnosis content DTC detecting condition Possible Cause P0131 Air fuel ratio (A/F) sensor 1 The A/F signal computed by ECM from • Harness or connectors (The A/F sensor 1 circuit is open or shorted.) • 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 |