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DTC P0037, P0038 HO2S2 HEATER EC-135 [KA24DE] C D E F G H I J K L M A EC 3. CHECK OUTPUT SIGNAL CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between heated oxygen sensor 2 terminal 3 and ECM terminal 122. 4. Also check harness for short to ground or short to power. OK or NG OK >> GO TO 5. NG >> GO TO 4. 4. DETECT MALFUNCTIONING PART Check the following. ● Harness connectors M81, F36 ● Harness for open or short between heated oxygen sensor 2 and ECM >> Repair open circuit or short to ground or short to power in harness or connectors. 5. CHECK HEATED OXYGEN SENSOR 2 HEATER Check the following. 1. Check resistance between terminals 2 and 3. 2. Check continuity. CAUTION: ● Discard any heated oxygen sensor which has been dropped ● Before installing new oxygen sensor, clean exhaust system OK or NG OK >> GO TO 6. NG >> Replace heated oxygen sensor 2. 6. CHECK INTERMITTENT INCIDENT Perform EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" >> INSPECTION END. Removal and Installation UBS00D2A HEATED OXYGEN SENSOR 2 Refer to . Continuity should exist. Resistance : 3.3 - 4.0 Ω [at 25°C (77°F)] Terminal No. Continuity 1 and 2, 3, 4 No 4 and 1, 2, 3 SEF221W |