Test O2 Sensor Heater Resistance
Test O2 Sensor Heater Resistance. On early gm vehicles, if the key was on, so were the o2 heaters. The first two are the pins that are wired to the heating element.
Disconnect oxygen sensor multiplug and locate terminals 3 and 4 of the oxygen sensor. I hope this is not causing the problem. Measuring heating circuit resistance of the good original downstream sensor shows 7 ohms, the replacement sensor shows 4 ohms.
How To Test The Oxygen Sensor Heater Element.
With your multimeter in ohms mode,. If your test shows that the o2 sensor's heater's resistance is not within specification, then we can conclude that the upstream sensor is fried and the cause of the p0135: The o2 sensor featured in this video is a 3 w.
If It Is Open Or Has Low Resistance, It Is Probably The Sensor.
Check the manufacturer's data for the vehicle under test. I did measure the voltage coming to the heating circuit on the connector to both sensors while sensors disconnected and engine key on. This test confirms that the o 2 sensor’s heater itself is working and would.
So Far, Your Rear O2 Sensor Heater Tests Have Found That:
I hope this is not causing the problem. Take your digital multimeter and turn the dial to read resistance ω, and then you are ready. Diagnostic trouble code (dtc) p0054 stands for “ho2s heater resistance (bank 1, sensor 2).
Approximately 3.5 Ω @20 °C.
Confirmed that the downstream o2 sensor's heater element is getting ground (test 2). Repair short, open, or high resistance in the wiring harness or harness connectors. When a new sensor is first installed, the pcm reads the resistance of the (cold) heater circuit and compares it to the known calibration of that particular type afr sensor.
Learn More About This Code, Its Symptoms, And Potential Causes With This Short Guide.
Typically the four wires on the zirconia lambda sensor are: Using a multimeter, measure and record the resistance value obtained between terminals 3 and 4 of the oxygen sensor (fig 1). Internal short circuit or open circuit in the heating element;
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