Unofficial Honda FIT Forums - 2018 EX OBD2 Engine Coolant Temperature Missing

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2018 EX OBD2 Engine Coolant Temperature Missing

Using Torque Pro and three different OBD2 Bluetooth adapters, I have attempted to observe the engine coolant temp. There is no data. Has anyone else experienced this in the 2018 Fit EX or similar models? All the other OBD2 readable parameters seem to be correctly functioning. I would like to monitor the temp in real-time and not have to solely rely on temp indicator warning light on the dash display. Any suggestions?

I can't comment on the 2018 but I have a 2016 EX and the ELM 327 Blue adapter from ebay and mine reads coolant temp with torque

well I get a readout on my 2015 with an UltraGauge so it can be done but yeah it's weird that three different adapters didn't work ... maybe it's the app?

Torque Pro works on my 2015

I also have now tried an Autoray OBD2 device and get the same thing. All the other ECU readings are as expected. There are no indications that anything is wrong. Just the missing engine coolant temp data. I am beginning to wonder if this is no longer reported out by the ECU on the 2018 models.

Sounds like the data is hidden within the canbus or some other data system on the 2018s, im sure the ecu reads coolant temp, just doesnt allow universal obd decoding, probably requires dealership obd2 with the cunbus sofware to view in real time. I run torque pro with an elm327 bluetooth, works great for me on my 2015 lx 6mt.

Thanks to all for your feedback. I have inquiries into several manufacturers of dedicated diagnostic readers to see if they can support the 2018 Fit. I am not very hopeful, but if something useful comes up, I will provide an update. If Honda now wants to obfuscate the engine coolant temp so that it is not readable by individual owners, what basic engine parameters are next?

I got a hold of an Autel AL319 reader and it could read all the parameters including engine coolant temp. My Bluetooth adapters must be cheap knockoffs which work okay on my 2014 Ford Escape and 2001 Toyota Tundra, but not so good on the 2018 Fit. Go figure.

Quote:

Originally Posted by drrusshorn (Post 1391708)

glad to hear! Coolant temp is one of the most important things to keep an eye on, i enjoy being able to watch it through the torque app. I designed a theme that matches our cars gauge/screen system perfectly.

That is the kind I thing I want to display as well. The AUTEL AL319 tool will give me the data when parked, however, I have ordered the BAFX 34t5 bluetooth adapter as a final attempt to get all the readouts I want displayed using Torque Pro on my smartphone. I hope the BAFX adapter does better than the other bluetooth adapters I have so far used.

please keep updating as you figure this out. I have the same issue - no coolant temp.. A 2018 EX with the torque pro android and an older Vgate scan Bluetooth adapt or. The setup works on my 2017 Tacoma and worked on my previous Prius C. I have a scanguage on the Tacoma which I'll try later today or tomorrow and see if it gets the coolant temp.

the scanguage doesn't show coolant temp on the 2018 fit, although it does on the 2017 Tacoma. Doesn't show the fresh air intake either..

just wrote this note to Scanguage. We'll see.
"2018 Honda FIT EX automatic. I've been using your scanguage on my various vehicles since 2011. Had it updated for transmission temperatures for a 2017 Toyota Tacoma. Bought a new Honda Fit and a few of the gauges wont read. Coolant temp and fresh air intake temp. The gauge works flawlessly on the other vehicles I have or have had. Any thoughts? Thanks, Mark S."

The missing data seems to extend to a variety of temp related parameters. I just tried the BAFX 34t5 bluetooth adapter and got the same results as all the other adapters. It too cannot read the ECT and other temp parameters. My dedicated AUTEL AL319 reader sees everything just fine, but AUTEL appears to periodically update their firmware, so they may be aware of this issue. I am going to send a message to AUTEL and see what they say. Innova said their products would not provide ECT readout, but I have not tried one of them to know for sure.

scanguage for 2018 fit

I wrote to scanguage about the coolant display. Here's their answer. Perhaps someone knows how to translate these parameters to a Torque PID

"

ScanGaugeII

People

service@linear-logic.com
Today at 10:23 AM

mark.schofield@sbcglobal.net

Message body

Mark,The 2018 Honda models do not report coolant temperature or intake air temperature the standard OBDII way anymore. In order to monitor these sensors you will need to enter an XGauge code. XGauge is a standard feature on the ScanGaugeII that allows you to monitor additional sensors. Please try the following XGauges for coolant temperature and intake air temperature:

Coolant Temperature 1 (Degrees Fahrenheit)
TXD: 33F10167
RXF: 044105670000
RXD: 3008
MTH: 00090005FFD8 (00010001FFD8 for Celsius)
NAME: CT1

Coolant Temperature 2 (Degrees Fahrenheit)
TXD: 33F10167
RXF: 044105670000
RXD: 3808
MTH: 00090005FFD8 (00010001FFD8 for Celsius)
NAME: CT2

Intake Air Temperature Alternative (Degrees Fahrenheit)
TXD: 33F10168
RXF: 054106680000
RXD: 3808
MTH: 00090005FFD8 (00010001FFD8 for Celsius)
NAME: IAT

On page 40 of the user manual you will find instructions on how to enter these codes. If you have any questions, please let me know.Regards,

Cristina Bollinger
Repairs and Technical Support
Linear Logic
1.888.433.5664

From: admin@scan-gauge.comSent: Saturday, January 27, 2018 2:34 PMTo: service@scangauge.comSubject: Website - General Information & Inquires - mark schofield

Namemark schofieldEmailmark.schofield@sbcglobal.netSubjectGeneral Information & InquiresMessage2018 Honda FIT EX automatic. I've been using your scanguage on my various vehicles since 2011. Had it updated for transmission temperatures for a 2017 Toyota Tacoma. Bought a new Honda Fit and a few of the gauges wont read. Coolant temp and fresh air intake temp. The gauge works flawlessly on the other vehicles I have or have had. Any thoughts? Thanks, Mark S.

Mark,

Thanks for sharing the Scangauge response which answers the basic question of what Honda is doing with the temp data on the 2018s. This is very useful if I decide to get a Scangauge.

Found this HOWTO link on the Scangauge Forum for converting XGauge to Torque PID:

https://torque-bhp.com/forums/?wpfor...topic&t=1728.0

The math that goes into the Torque PID equation field is rather tricky.

I have Ultragauge EM Plus 1.4. It also does not show the Engine Coolant temp.

I just bought the Lufi gauge and this gauge shows Engine Coolant temp.

I'm driving the 2018 Jazz manufactured in Aug 2018

Quote:

Originally Posted by drrusshorn (Post 1391416)

I couldn't get it to work on Toque Pro so I downloaded and bought Car Scanner Pro, they have a profile for Honda Fit and now I can see the coolant temperature.

I'm trying to find a way to display the app on my 2018 Fit Sport if someone has a tutorial?