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EC-174 < DTC/CIRCUIT DIAGNOSIS > [HR16DE] P0037, P0038 HO2S2 HEATER P0037, P0038 HO2S2 HEATER DTC Logic INFOID:0000000009020687 DTC DETECTION LOGIC 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 11 V at idle. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE With CONSULT 1. Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using CONSULT. 2. Start engine and warm it up to normal operating temperature. 3. Turn ignition switch OFF and wait at least 10 seconds. 4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 5. Let engine idle for 1 minute. 6. Check 1st trip DTC. With GST Follow the procedure “With CONSULT” above. YES >> Proceed to . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000009020688 1. CHECK HO2S2 POWER SUPPLY CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 (HO2S2) harness connector. 3. Turn ignition switch ON. 4. Check the voltage between HO2S2 harness connector and ground. Is the inspection result normal? YES >> GO TO 2. DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P0037 HO2 HTR (B1) The current amperage in the heated oxygen sensor 2 • Harness or connectors (Heated oxygen sensor 2 heater • Heated oxygen sensor 2 heater P0038 HO2 HTR (B1) The current amperage in the heated oxygen sensor 2 • Harness or connectors (Heated oxygen sensor 2 heater • Heated oxygen sensor 2 heater HO2S2 Ground Voltage Connector Terminal E63 2 Ground Battery voltage |