02' Grand Caravan Sport 3.3L Coolant Sensor Issue
I posted in the new members area, but I thought that posting here might be more helpful.
I am having a cooling fan issue. They don't come on unless the A/C is on, or the coolant temp wire is unplugged.
So I checked the voltage to the sensor, K/O E/O, No Key, and Running.
K/O E/O- 12.3V at the blue wire. 7.7ishV at the red wire (which I think can't be good)
No Key- 12.3 volts at the blue wire(which can't be good, but I triple checked this). 0v at the red wire.
Running- 14.4V at the blue wire. and 11.3ishV at the red wire.
Also I checked all of these with the wire disconnected from the sensor as well and the readings were similar, but only with the engine off and key on, or no key.
I am sure there is something wrong with this. Strangely enough the gauge is just going up like any old normal gauge, it never shows hot, stays right around 1/8 below the halfway point. I am thinking there is a wiring issue, but I wasn't sure about the PCM grounding, because the fans come on with the connector unplugged. And I am having a heck of a time finding online wiring diagrams for this model and year. I am wondering if I should just cut the wiring at the sensor and the PCM and see if the fans work right. I am not sure about a bad ground, because I think the PCM grounds these fans, and they are coming on with the connector to the sensor being unplugged and the A/C being turned on.
If anyone has access to a wiring diagram that would be helpful. Or If I am missing a ground somewhere that would cause this.