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EC-158 < DTC/CIRCUIT DIAGNOSIS > [VQ40DE] P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER Description INFOID:0000000009483838 SYSTEM DESCRIPTION The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating condition to keep the temperature of A/F sensor 1 element within the specified range. On Board Diagnosis Logic INFOID:0000000009483839 DTC Confirmation Procedure INFOID:0000000009483840 NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next step. Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at idle. 1. Start engine and let it idle for at least 10 seconds. 2. Check 1st trip DTC. 3. If 1st trip DTC is detected, go to Diagnosis Procedure INFOID:0000000009483841 1. CHECK GROUND CONNECTIONS 1. Turn ignition switch OFF. Sensor Input Signal to ECM ECM function Actuator Camshaft position sensor (PHASE) Engine speed Air fuel ratio (A/F) sensor 1 Air fuel ratio (A/F) sensor 1 heater Mass air flow sensor Amount of intake air DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0031 Air fuel ratio (A/F) sensor The current amperage in the A/F sensor 1 heater • Harness or connectors (The A/F sensor 1 heater circuit is • A/F sensor 1 heater P0051 P0032 Air fuel ratio (A/F) sensor The current amperage in the A/F sensor 1 heater • Harness or connectors (The A/F sensor 1 heater circuit is • A/F sensor 1 heater P0052 |