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EC-174 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0037, P0038, P0057, P0058 HO2S2 HEATER P0037, P0038, P0057, P0058 HO2S2 HEATER DTC Logic INFOID:0000000009651028 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- 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: >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Turn ignition switch ON. 4. Turn ignition switch OFF and wait at least 10 seconds. 5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 6. Let engine idle for 1 minute. 7. Check 1st trip DTC. Is 1st tip DTC detected? YES >> Proceed to . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000009651029 1. CHECK HO2S2 POWER SUPPLY 1. Disconnect heated oxygen sensor 2 (HO2S2) harness connector. 2. Turn ignition switch ON. 3. Check the voltage between HO2S2 harness connector and ground. DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0037 Heated oxygen sensor 2 The current amperage in the heated oxygen sensor • Harness or connectors (The heated oxygen sensor 2 heater • Heated oxygen sensor 2 heater P0038 Heated oxygen sensor 2 The current amperage in the heated oxygen sensor • Harness or connectors (The heated oxygen sensor 2 heater • Heated oxygen sensor 2 heater P0057 Heated oxygen sensor 2 The current amperage in the heated oxygen sensor • Harness or connectors (The heated oxygen sensor 2 heater • Heated oxygen sensor 2 heater P0058 Heated oxygen sensor 2 The current amperage in the heated oxygen sensor • Harness or connectors (The heated oxygen sensor 2 heater • Heated oxygen sensor 2 heater |