I have a 2004 Toyota Sienna LE and this VAN consumes fuel terribly. I did a scan and the result showed the following codes: P0037(HO2S Heater Control Circuit Low B1S2), P0057((HO2S Heater Control Circuit Low B2S2), P2241(O2 Sensor Pumping Current Circuit Low B2S1) and P2238(O2 Sensor Pumping Current Circuit Low B1S1). At first I thought of replacing all the sensors but after doing some research online I decided to test the sensors and their wiring harnesses. My test result showed that all the sensors are doing just fine and that the problem lies with their wiring harnesses.
1. The A/F Sensor B2S1 has a resistance of around 3.2 Ohm and a voltage of around 3.3V but it's wiring harness does not supply heater GROUND to the sensor as the heater power does.
2. The A/F Sensor B1S1 has a resistance of around 2.6 Ohm and a voltage of around 3.8V but it's wiring harness does not supply heater GROUND to the sensor as the heater power does.
3. The O2 Sensor B1S2 has a resistance of around 13.2 Ohm and a voltage of around 0.035V but it's wiring harness does not supply heater POWER to the sensor as the heater GROUND does-I guess that's why its voltage is this low, far below the specified voltage range of 0.1 to 0.9
4. The O2 Sensor B2S2 has a resistance of around 13.6 Ohm and a voltage of around 0.035V but it's wiring harness does not supply heater POWER to the sensor as the heater GROUND does-I guess that's why its voltage is this low, far below the specified voltage range of 0.1 to 0.9
This unreasonably low voltage in the O2 sensor widens the Injector Pulse unreasonably, I was made to understand, and hence, the reason behind the excessive fuel consumption by the car.
Please, can anyone out here provide a solution to these MISSING HEATER GROUND to the A/F Sensors and MISSING HEATER POWER to the O2 Sensors. Thanks for an expected response.
1. The A/F Sensor B2S1 has a resistance of around 3.2 Ohm and a voltage of around 3.3V but it's wiring harness does not supply heater GROUND to the sensor as the heater power does.
2. The A/F Sensor B1S1 has a resistance of around 2.6 Ohm and a voltage of around 3.8V but it's wiring harness does not supply heater GROUND to the sensor as the heater power does.
3. The O2 Sensor B1S2 has a resistance of around 13.2 Ohm and a voltage of around 0.035V but it's wiring harness does not supply heater POWER to the sensor as the heater GROUND does-I guess that's why its voltage is this low, far below the specified voltage range of 0.1 to 0.9
4. The O2 Sensor B2S2 has a resistance of around 13.6 Ohm and a voltage of around 0.035V but it's wiring harness does not supply heater POWER to the sensor as the heater GROUND does-I guess that's why its voltage is this low, far below the specified voltage range of 0.1 to 0.9
This unreasonably low voltage in the O2 sensor widens the Injector Pulse unreasonably, I was made to understand, and hence, the reason behind the excessive fuel consumption by the car.
Please, can anyone out here provide a solution to these MISSING HEATER GROUND to the A/F Sensors and MISSING HEATER POWER to the O2 Sensors. Thanks for an expected response.
