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EC-214 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] P0138, P0158 HO2S2 6. Check the voltage when revving up to 4,000 rpm under no load at least 10 times. (Depress and release accelerator pedal as soon as possible.) The voltage should be below 0.18V at least once during this procedure. If the voltage can be confirmed in step 6, step 7 is not nec- essary. 7. Keep vehicle at idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position. The voltage should be below 0.18V at least once during this procedure. 8. If NG, go to Diagnosis Procedure INFOID:0000000006158646 PROCEDURE FOR MALFUNCTION A 1. CHECK GROUND CONNECTIONS 1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections. 2. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Disconnect heated oxygen sensor 2 harness connector. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 78 and HO2S2 terminal 4. Refer to Wiring Diagram. 4. Also check harness for short to ground and short to power. OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors. 3. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT PBIB2054E BBIA0354E Continuity should exist. BBIA0435E |