How does the PCM affect the oxygen sensor?
As soon as the PCM sees the Rich Condition it’s causing (according to the oxygen sensor’s feedback), the PCM injects less fuel. The oxygen sensor immediately reports the change so that the less fuel the PCM injects into the engine, the smaller the voltage that the O2 sensor’s voltage produces. Its voltage can go as low as 0.050 to 0.100 Volts.
Where are the wires on the oxygen sensor?
Note that Brown/Violet and Brown/Light Green wires belong to the heater circuits of the front oxygen sensors. In Chrysler vehicles, four wire oxygen sensor heater circuits tend to be powered by the PCM instead of grounded (they are grounded to the chassis).
Is there a way to trace an O2 sensor?
However, we have not yet covered tracing O2 sensor wiring and checking for a “lazy” sensor. After reviewing the basics, we will move onto troubleshooting these more advanced oxygen sensor issues. Oxygen and air-fuel sensors are the vehicle’s personal emissions analyzer.
How does an oxygen sensor work in a Chrysler?
In Chrysler vehicles, four wire oxygen sensor heater circuits tend to be powered by the PCM instead of grounded (they are grounded to the chassis). On Mitchell 1, the heater circuit appears as a line then bends back and forth like a tributary in the picture of the sensor.
How does the PCM work with the O2 sensor?
When the air-fuel or oxygen sensor senses a rich fuel mixture in the exhaust, the PCM takes that information and then tries to do the opposite to make a fuel mixture that is perfect (called “Lambda”) by sending fuel trims in the opposite direction. The same is true when the oxygen sensor senses a lean fuel mixture in the exhaust.
Where do the pins go on a Vortec PCM?
Here they are, the Pin# will be highlighted in RED. If removing trans, pay attention to BLUE connector pin 41. Some harnesses are different based on type of o2 sensors you have. Some this pin goes to trans only, some harnesses, there is a splice, and this pin goes to coolant temp sensor AND transmission.
Note that Brown/Violet and Brown/Light Green wires belong to the heater circuits of the front oxygen sensors. In Chrysler vehicles, four wire oxygen sensor heater circuits tend to be powered by the PCM instead of grounded (they are grounded to the chassis).
What happens when PCM injects too much O2?
If the PCM injects too much, the O2 sensors will let it know and the PCM responds by injecting less. If it doesn’t inject enough, they’ll make it aware of it and the PCM will inject more. The O2 sensors accomplish this by producing anywhere from 0.100 Volts to a maximum of 1 Volt of direct current that is sent directly to the PCM.