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EC-646 < COMPONENT DIAGNOSIS > [VK56DE] P0138, P0158 HO2S2 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 4. Let engine idle for 1 minute. 5. Set voltmeter probes between ECM terminal 55 [HO2S2 (B2) signal] and ground, or 74 [HO2S2 (B1) sig- 6. Check the voltage when revving up to 4,000 rpm under no load 7. Keep vehicle at idling for 10 minutes, then check the voltage. Or 8. If NG, go to Diagnosis Procedure INFOID:0000000003936579 PROCEDURE FOR MALFUNCTION A 1. CHECK GROUND CONNECTIONS 1. Turn ignition switch OFF. 2. Loosen and retighten ground screws on the body. OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections. 2. CHECK HEATED OXYGEN SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Disconnect heated oxygen sensor 2 (HO2S2) harness connector. PBIB2054E BBIA0539E ALBIA0365ZZ 2009 Pathfinder |