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DTC P0155 - FRONT LEFT HO2S HEATER Nissan Maxima A32

Testing & Diagnostics ~205 words
  1. Check Ground Circuit Turn ignition off. Disconnect HO2S harness connector and ECM harness connector. (Схема №2)and (Схема №9). Using an ohmmeter, check continuity between ECM harness connector terminal No. 121 and HO2S harness connector terminal No. 1 (Blue wire). If no continuity exists, repair open in Blue wire. If continuity exists, go to next step.
  2. Check Power Supply Turn ignition on. Using a voltmeter, measure voltage between front left HO2S harness connector terminal No. 3 (Red/Black wire) and ground. If battery voltage does not exist, check for blown fuse No. 34 or repair fault in Red/Black wire. If battery voltage exists, go to next step.
  3. Check Component Turn ignition off. Leave rear HO2S harness connector disconnected. Measure resistance between HO2S terminals No. 1 (Blue wire) and No. 3 (Red/Black wire). Resistance should be 2.3-4.3 ohms at 77°F (25°C). Continuity should not be present between any other HO2S terminals. Replace HO2S if not as specified. If HO2S is okay, go to next step.
  4. Loosen and retighten engine ground screws. Disconnect ECM and HO2S wiring harness connector. Check terminals for damage or corrosion. Repair if necessary and perform «FINAL CHECK»(ref-17943-S12355810372001121700000). If fault is still present, replace front left HO2S sensor.

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