What should I do if my O2 sensor shorted out?
In that case, first check for a blown fuse. If the O 2 sensor’s heater had shorted out, the fuse may have blown as well. Once you determine that the fuse is okay, check for voltage at the O 2 sensor harness connection. The modified test harness with the light will give you easy access to the circuit.
How to diagnose O2 sensor heater circuit failure?
The modified test harness with the light will give you easy access to the circuit. Remember, the engine needs to be running at this point. If the voltage is close to zero on the positive heater wire, then locate the open circuit in the power wire back to the fuse. Again, it may have a relay in the circuit as well.
Why did I replace the O2 sensor on my PCM?
But replacing an O2 sensor wouldn’t usually damage the PCM unless something like that did happened. More likely though, it had nothing to do w/replacing the O2 sensor, it was the attempt to reset the CEL that damaged the PCM. Some spark or other problem when the connection of the PCM port was made to the scan tool maybe.
What kind of voltage does the O2 sensor produce?
The O2 sensor produces it’s own voltage signal to the computer. And this is only 0-1 VDC. However, the computer grounds the heater circuit for the O2 sensor. So if the computer fried after installing the O2 sensor, there may have been a problem with the heater in the O2 sensor itself.
In that case, first check for a blown fuse. If the O 2 sensor’s heater had shorted out, the fuse may have blown as well. Once you determine that the fuse is okay, check for voltage at the O 2 sensor harness connection. The modified test harness with the light will give you easy access to the circuit.
The modified test harness with the light will give you easy access to the circuit. Remember, the engine needs to be running at this point. If the voltage is close to zero on the positive heater wire, then locate the open circuit in the power wire back to the fuse. Again, it may have a relay in the circuit as well.
But replacing an O2 sensor wouldn’t usually damage the PCM unless something like that did happened. More likely though, it had nothing to do w/replacing the O2 sensor, it was the attempt to reset the CEL that damaged the PCM. Some spark or other problem when the connection of the PCM port was made to the scan tool maybe.
The O2 sensor produces it’s own voltage signal to the computer. And this is only 0-1 VDC. However, the computer grounds the heater circuit for the O2 sensor. So if the computer fried after installing the O2 sensor, there may have been a problem with the heater in the O2 sensor itself.