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ECM-210 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] P0137 HO2S2 3. CHECK HEATED OXYGEN SENSOR 2-2 WITHOUT CONSULT 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Restart engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no 4. Let engine idle for 1 minute. 5. Check the voltage between ECM harness connector terminals under the following conditions. Is the inspection result normal? YES >> INSPECTION END NO >> GO TO 4. 4. CHECK HEATED OXYGEN SENSOR 2-3 WITHOUT CONSULT Check the voltage between ECM harness connector terminals under the following conditions. Is the inspection result normal? YES >> INSPECTION END NO >> GO TO 5. 5. CHECK HEATED OXYGEN SENSOR 2-4 WITHOUT CONSULT Check the voltage between ECM harness connector terminals under the following conditions. CAUTION: Always drive vehicle at a safe speed. Is the inspection result normal? YES >> INSPECTION END NO >> GO TO 6. 6. REPLACE HEATED OXYGEN SENSOR 2 Replace malfunctioning heated oxygen sensor 2. Refer to . ECM Condition Voltage Connector + – Terminal F16 57 59 Revving up to 4,000 rpm quickly under no load The voltage should be above 0.77 V at ECM Condition Voltage Connector + – Terminal F16 57 59 Keeping engine at idle for 10 minutes. The voltage should be above 0.77 V at ECM Condition Voltage Connector + – Terminal F16 57 59 Coasting from 80 km/h (50 MPH) with selector The voltage should be above 0.77 V at |