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P0043, P0044 HO2S3 HEATER EC-161 < COMPONENT DIAGNOSIS > [QR25DE FOR CALIFORNIA] C D E F G H I J K L M A EC N P O P0043, P0044 HO2S3 HEATER Description INFOID:0000000004349204 SYSTEM DESCRIPTION The ECM performs ON/OFF control of the heated oxygen sensor 3 heater corresponding to the engine speed, amount of intake air and engine coolant temperature. OPERATION DTC Logic INFOID:0000000004349205 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at idle. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE With CONSULT-III CAUTION: Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws. 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Start the engine and drive vehicle at a speed of 80 km/h (50 MPH) or more for at least 3 consecutive min- utes. Sensor Input signal to ECM ECM function Actuator Camshaft position sensor (PHASE) Engine speed Heated oxygen sensor 3 Heated oxygen sensor 3 heater Crankshaft position sensor (POS) Engine coolant temperature sensor Engine coolant temperature Mass air flow sensor Amount of intake air Engine speed Heated oxygen sensor 3 heater Above 3,600 rpm OFF Below 3,600 rpm after the following conditions are met. (Keep the vehicle speed as steady as possible during the cruising.) ON DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0043 Heated oxygen The current amperage in the heated oxygen sen- • Harness or connectors (The heated oxygen sensor 3 heater circuit is • Heated oxygen sensor 3 heater P0044 Heated oxygen The current amperage in the heated oxygen sen- • Harness or connectors (The heated oxygen sensor 3 heater circuit is • Heated oxygen sensor 3 heater |