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P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER EC-633 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] C D E F G H I J K L M A EC N P O P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER Description INFOID:0000000007358484 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 at the specified range. On Board Diagnosis Logic INFOID:0000000007358485 DTC Confirmation Procedure INFOID:0000000007358486 NOTE: If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next step. 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 between 10.5 V and 16 V 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:0000000007358487 1. CHECK GROUND CONNECTIONS 1. Turn ignition switch OFF. 2. Loosen and retighten ground screws on the body. 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 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 1 The current amperage in the air fuel ratio (A/F) • Harness or connectors (The A/F sensor 1 heater circuit is • A/F sensor 1 heater P0051 P0032 Air fuel ratio (A/F) sensor 1 The current amperage in the air fuel ratio (A/F) • Harness or connectors (The A/F sensor 1 heater circuit is • A/F sensor 1 heater P0052 August 2012 2012 Pathfinder |