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Home >> Suzuki >> 1999 >> Swift Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0135: Heated Oxygen Sensor (Ho2S) No. 1 Heater Circuit Malfunction
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DTC P0135: Heated Oxygen Sensor (Ho2S) No. 1 Heater Circuit Malfunction

  1. Start engine and allow it to reach operating temperature. Stop engine. Turn ignition on. Using DVOM, backprobe between ground and PCM 16-pin harness connector "B" terminal No. 7 (Blue/Orange wire on Esteem, or Pink/Black wire on Swift). Reading should be greater than 10 volts. With voltmeter still connected, start engine and let idle. Reading should be less than 1.9 volts. If readings are not as specified, go to next step. If readings are as specified, check for an intermittent problem. Go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition off. Disconnect HO2S No. 1 harness connector. Measure resistance of HO2S No. 1 between sensor connector terminals No. 3 (Blue/Orange wire on Esteem, or Pink/Black wire on Swift) and No. 4 (Black/White wire). If measured resistance is 11.7-15.6 ohms at about 68°F (20°C), go to next step. If measured resistance is not 11.7-15.6 ohms at about 68°F (20°C), replace HO2S No. 1. Retest system.
  3. Check Blue/Orange wire on Esteem, or Pink/Black wire on Swift, between HO2S No. 1 and PCM for an open or short to ground. Repair as necessary. If wire is okay, replace PCM. Retest system.
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