OBD II PID for engine oil temp and pressure
- Thread starter riyhen
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
Anyone know if this was answered elsewhere?
Sent from my XT1254
Sent from my XT1254
The PIDs might be listed in the manual for the scangauge2. Download the manual from their site and see. I bet it's there.
I was playing with building some OBDFusion screens today and wanted to monitor engine oil pressure. There was a parameter for this in the softwhere but with the vehicle running, it goes away. I have the Toyota PIDs and there does not seem to be any oil pressure available. I searched here and found this thread. Anyone found an oil pressure on their OBD2?
Did you ever work this out ? Trying the same thing with torque pro .
The gauge on the dash exits so surely there is a PID somewhere!?
No. There doesn’t seem to be any actual oil pressure signal available on the OBD. I think the oil pressure sending unit is a on/off type switch and not a pressure transducer/transmitter. Does seem weird as the dash is a gauge.
Our oil pressure sender has a diaphragm that moves a potentiometer to alter resistance on a single wire.. and this goes straight to the gauge cluster, nothing to the ECU (unless the cluster then sends a signal to the ECM via CANBUS)
It is strange to me that the ECM wouldn't have an oil pressure input.. as pressure will be important for the variable valve timing our engines have. But per the wiring diagrams this seems to be the case.
Interesting. Most of the gauges on the dash I thought were actually fed via canbus. How is the oil pressure light triggered?
I think oil pressure might exist on later model 200s (2018+), but it's definitely not a PID supplied by the OBD Fusion Toyota PID packs for 2008-2015.
Per the wiring diagrams 16+ added a 'thermo switch' to the low-oil light switch for the gauge cluster, but no additional pressure senders to the ECM. That's the only relevant difference I can find.
08-15 low oil switch
16+
08-15 low oil switch
16+
Interesting. I guess that just sets off the oil light on the dash if the engine oil temp is too high?
I can read oil temp on my 2013 via OBD Fusion but I have no idea what's "bad".
The FSM indicates there's a power steering oil pressure switch too though I don't know how it alerts you to a low pressure situation. It says 3 cycles in a row will illuminate a MIL but I don't know which one. ¯\_(ツ)_/¯
The odd thing about the oil temp switch is as long as the level is still adequate the circuit should be closed so I don't know how the thing works. Or maybe it is a closed circuit (whether from excess temp or inadequate level) that triggers the light?
I Just don't see where they'd be getting the oil temp signal from on our 2013s.. could be that the ECU extrapolates it from other things it is seeing?
As for the PS pressure sender, I believe that is to raise idle if the pressure gets too low. But yes it can throw a code for open circuit or short to ground if those conditions are present. I seem to remember someone posting about this in the last year.
I dunno but OBD Fusion has a PID for "Engine Oil Temperature *F" and it reports differently from the A/T temps and the coolant temp.
I've noticed the FSM doesn't always seem to include every bit of info about how stuff works. It's really around repair diagnostics and replacement of parts, so if it's something only reporting into canbus and only used by the ECU there might not be a lot of info available to us about how it operates if Toyota assumed we wouldn't use the info to make a diagnostic decision (regardless of whether the ECU uses the info).
I've noticed the FSM doesn't always seem to include every bit of info about how stuff works. It's really around repair diagnostics and replacement of parts, so if it's something only reporting into canbus and only used by the ECU there might not be a lot of info available to us about how it operates if Toyota assumed we wouldn't use the info to make a diagnostic decision (regardless of whether the ECU uses the info).
I get that but it's just not in the EWD. And not that those are absolutely perfect, occasionally they'll get a connector designation wrong or something, but for a complete circuit to be left out of all years of 200 would be odd, to me.
My suspicion about it being calculated partially comes from knowing they calculate other things they can report but aren't measuring directly, like catalyst temp.