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Home >> Acura >> 2002 >> 3.2CL Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0135: Primary Heated Oxygen Sensor Heater Circuit Malfunction Or DTC P0141: Secondary Heated Oxygen Sensor Heater Circuit Malfunction

DTC P0135: Primary Heated Oxygen Sensor Heater Circuit Malfunction Or DTC P0141: Secondary Heated Oxygen Sensor Heater Circuit Malfunction

  1. Perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. If DTC P0135 or P0141 resets, go to next step. If DTCs does not reset, problem is intermittent. System is okay at this time. Check for poor connection(s) or loose wire(s) between Primary Heated Oxygen Sensor (HO2S-1) or Secondary Heated Oxygen Sensor (HO2S-2) harness connectors and PCM harness connectors.
  2. Turn ignition switch off. Disconnect suspect HO2S 4-pin connector. Measure resistance between HO2S terminals No. 3 and 4. See Figure . If suspect HO2S heater resistance is 10-40 ohms, go to next step. If resistance is not as specified, replace suspect HO2S. See WIRING DIAGRAMS article.
  3. Check for continuity between ground and suspect HO2S 4-pin connector terminals No. 3 and 4 individually. If continuity is not present, go to next step (MDX and 3.2TL) or step  6 (3.2CL). If continuity is present, replace suspect HO2S.
  4. Turn ignition switch on. Measure voltage between suspect HO2S 4-pin harness connector terminals No. 3 and 4. If battery voltage is present, go to next step. If battery voltage is not present, go to step  6
  5. Turn ignition switch off. Disconnect PCM 31-pin harness connector (H02S-1) or 32-pin harness connector (HO2S-2). Check continuity between ground and PCM 31-pin harness connector terminal No. 1 (Black/White wire), or between ground and PCM 32-pin harness connector terminal No. 8 (Black/White wire). If continuity is present, repair short in Black/White wire(s) between suspect PCM harness connector and appropriate HO2S 4-pin harness connector. If continuity is not present, substitute known-good PCM, then recheck. If symptom or indication goes away, replace original PCM. See WIRING DIAGRAMS article. Repair as necessary.
  6. Start engine. Measure voltage between ground and suspect HO2S 4-pin harness connector terminal No. 4 (Black/Yellow wire). See Figure . If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/Yellow wire between No. 6 ECU CRUISE fuse (15-amp) in driver's under-dash fuse/relay box and suspect HO2S 4-pin harness connector terminal No. 4.
  7. Turn ignition switch off. Reconnect HO2S 4-pin harness connectors. Disconnect PCM 31-pin harness connector (HO2S-1) or 32-pin harness connector (HO2S-2). Turn ignition switch on. Measure voltage between PCM 25-pin harness connector terminal No. 2 (Black wire) and PCM 31-pin harness connector terminal No. 1 (Black/White wire) or between PCM 25-pin harness connector terminal No. 2 (Black wire) and PCM 32-pin harness connector terminal No. 8 (Black/White wire). If 0.1 volt or less is present, repair open in Black/White wire(s) between suspect PCM and HO2S harness connectors. See WIRING DIAGRAMS article. Repair as necessary. If more than 0.1 volt is not present, substitute known-good PCM, then recheck. If symptom or indication goes away, replace original PCM.
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