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DTC P0131: HO2S-1 LOW VOLTAGE Honda CR-V I

Testing & Diagnostics 1 illustration ~478 words
  1. Perform PCM reset procedure. See «PCM RESET PROCEDURE/CLEARING DTCS»(ref-16284-S05371059252001010800000). Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral, until radiator fan comes on. Road test vehicle with transmission in "2" position (A/T) or 4th gear (M/T). Using scan tool, check HO2S-1 output voltage during acceleration using Wide Open Throttle (WOT). If voltage stays at 0.1 volt or less, go to next step. If voltage does not stay at 0.1 volt or less, problem is intermittent. System is okay at this time. Check for poor connections or loose wires between HO2S-1 connector and PCM connectors. See the «WIRING DIAGRAMS»(ref-16319) article.
  2. Check fuel pressure. See FUEL SYSTEM in the BASIC TESTING article. If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, repair fuel supply system as necessary.
  3. Turn ignition off. Disconnect HO2S-1, 4-pin connector. Start engine and run at idle. Using scan tool, check HO2S-1 output voltage. If voltage stays at 0.1 volt or less, go to next step. If output voltage does not stay at 0.1 volt or less, replace HO2S-1.
  4. Turn ignition off. Disconnect PCM connector "D". see scheme 2 Measure resistance between ground and HO2S-1 harness connector White wire. If continuity exists, repair short to ground in wire between PCM connector D7 and HO2S-1. If continuity does not exist, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.

Scheme 9

Scheme 9: DTC P0132: HO2S-1 SENSOR HIGH VOLTAGE
Scheme 9: DTC P0132: HO2S-1 SENSOR HIGH VOLTAGE
  1. Perform PCM reset procedure. See «PCM RESET PROCEDURE/CLEARING DTCS»(ref-16284-S05371059252001010800000). Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral, until radiator fan comes on. Road test vehicle with transmission in "2" position (A/T) or 4th gear (M/T). Using scan tool, check HO2S-1 output voltage during deceleration using fully closed throttle. If voltage stays at one volt or more, go to next step. If voltage does not stay at one volt or more, problem is intermittent, system is okay at this time. Check for poor connections or loose wires between HO2S-1 and PCM connectors.
  2. Turn ignition off. Disconnect HO2S-1, 4-pin connector. Install jumper wire between HO2S harness connector terminals No. 1 and No. 2. (Scheme 9) Turn ignition on. Using scan tool, check HO2S-1 output voltage. If output voltage is one volt or more, go to next step. If output voltage is not one volt or more, replace HO2S-1.
  3. Turn ignition off. Connect jumper wire between PCM connector "D" terminal D7 and terminal D11. Turn ignition on. Using scan tool, check HO2S-1 output voltage. If voltage is not one volt or more, repair open in wire between PCM harness connector terminal D18 or terminal D7 and HO2S-1 harness connector. See the «WIRING DIAGRAMS»(ref-16319) article. If voltage is one volt or more, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.

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