VVT Oil Temperature

[GlitchMobile]

Can someone please let me know where the VVT Oil Temperature sensor is located
on a 2017 Ram 1500, 5.7L ?
I've checked the service manual from Chrysler, Alldata.com and neither of them
reference it.
How do I know it exists?
My scan gauge displays its readout (see attached photo).

The VVT Oil Temperature is providing different results compared to the engine
oil temperature sensor.

 

[crash68]

it possible the sensor doesn't exist. Not sure why there would be a need for two oil temps. Are you getting an error code?
The Cummins has an oil temperature read out on the dash but it doesn't have an oil temperature sensor.

 

[Mister Luck]

Is it possible it’s the solenoid for the VVT camshaft timing ?
Wouldn’t the solenoid work off of oil pressures in the camshaft?
(Sorry I was looking at the VVT pressure not the temp)

 

[GlitchMobile]

it possible the sensor doesn't exist. Not sure why there would be a need for two oil temps. Are you getting an error code?
The Cummins has an oil temperature read out on the dash but it doesn't have an oil temperature sensor.

Yes a P2181 on occasion and P0118. The ECT circuit (related to the P0118) is intact and functioning.

The 2017 has Oil temp and Oil Pressure readout in its "Vehicle Info" on the IPC.

Some third gen Rams had a 2nd ECT at the coolant radiator, so maybe
Chrysler designers introduced the VVT Oil Temp sensor to protect the VVT
system and omitted to document it. (I've seen omitted component documentation before, with a Toyota L/C).

 

[GlitchMobile]

Is it possible it’s the solenoid for the VVT camshaft timing ?
Wouldn’t the solenoid work off of oil pressures in the camshaft?

The VVT is purely a solenoid valve that redirects the passage of oil to the internals of the HEMI.

 

[Mister Luck]

The VVT is purely a solenoid valve that redirects the passage of oil to the internals of the HEMI.

You mean the solenoid pressure valve for the VVT doesn’t work off of oil pressure ?
My theory was the solenoid works off either pressure or temperature like on the valve body of a transmission,
I can find a VVT oil pressure valve solenoid but not a temperature solenoid for the VVT
I have other theories too but this is your thread and I would like to hear what you’ve found.

 

[crash68]

Yes a P2181 on occasion and P0118. The ECT circuit (related to the P0118) is intact and functioning.

The 2017 has Oil temp and Oil Pressure readout in its "Vehicle Info" on the IPC.

Both those codes are for engine coolant temperature (sensor) problems. Your problem could even be for the engine not warming up fast enough or hot enough. Has the thermostat been replaced with one lower than 195°F?

You mean the solenoid pressure valve for the VVT doesn’t work off of oil pressure ?
My theory was the solenoid works off either pressure or temperature like on the valve body of a transmission,

No the VVT solenoid is not a hydraulic pressure or temperature operation valve, it gets an electrical signal from the ECM based on engine rpm, load, etc.

 

[Mister Luck]

No the VVT solenoid is not a hydraulic pressure or temperature operation valve, it gets an electrical signal from the ECM based on engine rpm, load, etc.

Then the VVT oil temperature sensor is part of the signal designated for the algorithmic actuation or the VVT valve as it comes from the ECM ?
If the ECM doesn’t see correct voltage tolerance values for oil temperature or is conflicted by oil pressure voltage readings the VVT solenoid doesn’t activate , then it’s determined if the solenoids “systems” is not functioning not the solenoid itself.
I notice for example my engines oil pressure drops after warm up
hence a correlation between pressure and temperature is indicated as a proper function.

 

[Mister Luck]

Review of the CAN Buss for FCA Chrysler etc there is input for multi displacement system (solenoid)
DMS vvt oil pressure as two separate saved values as either pass timer or fail timer
also oil pressure pass loop control
MDS DSP oil pressure sense fault , delete , pass, loop control, fail control

I suppose these values are seen in AlfaOBD , and other OBD software interface devices as records or events.