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DTC P0137 - SECONDARY HO2S-2 SENSOR LOW VOLTAGE Isuzu Oasis I

Testing & Diagnostics ~212 words
  1. Perform PCM reset procedure. See «TESTS W/CODES - INTRODUCTION»(ref-16345) article. Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral until radiator fan comes on. Using OBD-II scan tool, check HO2S-2 output voltage with engine at 3000 RPM. If voltage stays at 0.3 volt or less, go to next step. If voltage does not stay at 0.3 volt or less, problem is intermittent. System is okay at this time. Check for poor connections or loose wires at HO2S-2 and PCM connectors. See WIRING DIAGRAMS article. Repair as necessary.
  2. Turn ignition off. Disconnect HO2S-2, 4-pin connector. Start engine. Using OBD-II scan tool, check HO2S-2 output voltage. If output voltage stays at 0.3 volt or less, go to next step. If output voltage does not stay at 0.3 volt or less, replace HO2S-2.
  3. Turn ignition off. Disconnect PCM 32-pin connector "A". Check for continuity between ground and HO2S-2 harness connector terminal No. 1 (White/Red wire). (Схема №9) If continuity exists, repair short in White/Red wire between PCM 32-pin connector "A" terminal A23 and HO2S-2 harness connector. See WIRING DIAGRAMS article. If continuity does not exist, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.

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