2005 Town and Country 3.8 FWD.
5 VOLT SUPPLY - PCM OUTPUT
The PCM supplies 5 volts to the following sensors:
- A/C pressure transducer
- Ambient Temperature sensor
- Battery temperature
- Camshaft Position Sensor (NGC)
- Crankshaft Position Sensor (NGC)
- Engine coolant temperature sensor
- Inlet Air Temperature Sensor
- Knock sensor
- Linear EGR solenoid (if equipped)
- Manifold absolute pressure sensor
- Oil Pressure Switch
- Throttle position sensor
This is from All data.
My oil light flickered. I checked pressure with mechanical gage, all is good. I replaced switch then light comes on stays on sometimes turns off. I started to check wiring integrity and in the process I discovered oil coming out of the electrical end of the new sensor. So the problem is resolved.
But I just have one question I’d like answered about something, because I like to learn things. From All data in PCM Description of operation it states that supply voltage to the oil pressure switch is 5 volts. When I checked voltage at the switch connector, unplugged, I got battery voltage. I believe everything is in working order, I am just wondering if anyone can educate me on why I am seeing battery voltage instead of 5 volts. I did not check voltage with connector hooked up, but it says supply voltage, which to me means voltage to sensor from PCM should be 5 volts.