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DTC P0138 - SECONDARY HO2S-2 SENSOR HIGH VOLTAGE Honda Prelude V

Testing & Diagnostics ~244 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 0.6 volt or more, go to next step. If voltage does not stay at 0.6 volt or more, problem is intermittent. System is okay at this time. Check for poor connections or loose wires at HO2S-2 and PCM connectors. Repair as necessary.
  2. Turn ignition off. Disconnect HO2S-2, 4-pin connector. Connect a fused jumper wire between HO2S-2 harness 4-pin connector terminals No. 1 (Green/Black wire) and No. 2 (White/Red wire). (Схема №8) Turn ignition on. Using OBD-II scan tool, check HO2S-2 output voltage. If output voltage is 0.6 volt or more, go to next step. If output voltage is not 0.6 volt or more, replace HO2S-2.
  3. Turn ignition off. Connect a fused jumper wire between PCM 16-pin connector "D" terminals D11 (Green/Black wire) and terminal D14 (White/Red wire). (Схема №4) Turn ignition on. Using OBD-II scan tool, check HO2S-2 output voltage. If voltage is not 0.6 volt or more, repair open in suspect wire between PCM 16-pin connector "D" and HO2S-2 sensor connector. See «WIRING DIAGRAMS»(ref-16355) article. If voltage is 0.6 volt or more, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.

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