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  #37  
Old 07-01-2014, 11:15 AM
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Re: Transmission & Oil Temperatures

How do you guys measure the transmission & oil fluid temperatures? The stock "gauge" on the dash usually shows the coolant temp.

My dash coolant temperature gauge doesn't have numbers so I have a ScanGauge device on my OBDII port but its only capable of displaying the coolant temperature, not the transmission or engine oil temps.

I'm thinking of adding a transmission fluid temperature sensor in my transmission pan. Should I consider adding an engine oil temperature sensor too?
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  #38  
Old 07-01-2014, 11:23 AM
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Re: Transmission & Oil Temperatures

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Originally Posted by JeepFever View Post
How do you guys measure the transmission & oil fluid temperatures? The stock "gauge" on the dash usually shows the coolant temp.

My dash coolant temperature gauge doesn't have numbers so I have a ScanGauge device on my OBDII port but its only capable of displaying the coolant temperature, not the transmission or engine oil temps.

I'm thinking of adding a transmission fluid temperature sensor in my transmission pan. Should I consider adding an engine oil temperature sensor too?
Engine oil and transmission temps are on the EVIC. Page up or down to the page that has tire pressures then left or right to page over to the trans or engine temps.

Your Scanguage2 has an Xguage feature that requires you to manually enter codes to setup unsupported data points. We now have 3 additional Xguage codes documented for EGT, DPF, and CAT temperatures.

Scanguage2 XGuage codes for EGT
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  #39  
Old 07-31-2014, 03:38 PM
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Re: Transmission & Oil Temperatures

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Originally Posted by ExcursionDiesel View Post
Engine oil and transmission temps are on the EVIC.
Yeah but having Torque capture the data off the OBD2 bus enables me/us to log said data. Anybody know the transmission temp sensor code?

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Originally Posted by JeepFever View Post
I have a ScanGauge device on my OBDII port but its only capable of displaying the coolant temperature, not the transmission or engine oil temps.
I have Torque running on Android with a bluetooth OBD2 scanner, and it shows the engine oil temp. So far it's always been within a few degrees of the coolant temp, but I haven't really pushed the system since getting my OBDII scanner. Is there a way for me to get the code of the engine oil temp sensor out of Torque?
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  #40  
Old 07-31-2014, 10:00 PM
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Re: Transmission & Oil Temperatures

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Originally Posted by Rumline View Post
Yeah but having Torque capture the data off the OBD2 bus enables me/us to log said data. Anybody know the transmission temp sensor code?

I have Torque running on Android with a bluetooth OBD2 scanner, and it shows the engine oil temp. So far it's always been within a few degrees of the coolant temp, but I haven't really pushed the system since getting my OBDII scanner. Is there a way for me to get the code of the engine oil temp sensor out of Torque?
I've been wondering about the trans temp as well. I can see it in EVIC but not in Torque. For drivetrain temps in Torque I get oil, coolant, EGT and CAT1. Looking for trans temp, fuel rail pressure and oil pressure. I know the data is there, it's just a matter of telling the ECU the right thing to get it to transmit on the bus.

I did a full extended PID scan in TorqueScan (took about 45 minutes) and came back with nothing more than what it found on standard PID's.
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  #41  
Old 11-02-2014, 06:30 PM
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Re: Transmission & Oil Temperatures

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Originally Posted by frall9 View Post
I just purchased a 2014 Overland Diesel about 10 days ago, and I'm seeing transmission temps in the 195 range in stop and go traffic and around town here in Los Angeles. What worried me is that this is the only gauge in the EVIC where the "normal" operating temp of 195-205 as some have mentioned on this thread is far past the mid-point of the gauge display. I actually emailed Chrysler to confirm the proper temp and they were useless and directed me to purchase a service manual and contact my dealer. I then spoke to my dealer service department who said that as long as I don't see a warning light it's fine, so again useless.



This thread has made me feel more comfortable about what I'm seeing, but it would be great if someone is able to confirm with Jeep/Chrysler and/or ZF that they officially expect these transmissions to run in that 200 degree range. Some ZF literature actually states that temps over 200 degrees will do irreparable damage to their transmission, so I'm still a bit nervous on this issue.



Thanks to everyone for the input though.

This, getting 199 on 50 deg day in stop-n-go traffic. Concerned about towing my boat next summer. If this Normal, I'll be changing trans fluid more often.
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  #42  
Old 11-02-2014, 06:36 PM
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Transmission & Oil Temperatures

I haven't seen any transmission literature stating 200 degree temps will cause damage. In any case, fear not...the 8HP series (and 845RFE) are designed to operate in the 190-210 range regularly. In fact, they control the amount of fluid going to the cooler specifically to stay in that range. Try this sometime: drive at a steady speed in top gear. Then give it some brisk acceleration, followed by settling back to a steady speed. Then, watch the transmission temps...they will climb to around 197-199...then without warning suddenly drop to 192-195 (sometimes lower...into the high 180s). Same airflow...but the temps dropped VERY rapidly after holding for a bit. The transmission started shunting some more fluid through the cooler.

With this transmission and the type of fluid used you have little to worry about unless you see sustained temperatures of 240 or higher.

FYI on the Ram trucks with the same transmission, a fluid heater is actually used to bring the temperature to the 190ish range more quickly.
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  #43  
Old 11-17-2014, 08:23 PM
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Re: Transmission & Oil Temperatures

G'Day all, new Jeep owner here (ex disco 3 owner). Have been doing allot of reading on many posts of varying issues and trans. temp issue is on top of my list as I had issues with my Disco tranny of overheating. I'm understanding more of what is classed as 'normal' operating temp. The issue especially for newbies is the scale of the temp meter in the car is incorrect. Where normal transmission operating temp on the gauge sits at about 3/4. For me the scale of the gauge needs to be adjusted for 'normal' operation. I'm sure Jeep will have allot less hassles from owners if this was the case.
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  #44  
Old 11-18-2014, 07:36 AM
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Re: Transmission & Oil Temperatures

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Originally Posted by cessa View Post
G'Day all, new Jeep owner here (ex disco 3 owner). Have been doing allot of reading on many posts of varying issues and trans. temp issue is on top of my list as I had issues with my Disco tranny of overheating. I'm understanding more of what is classed as 'normal' operating temp. The issue especially for newbies is the scale of the temp meter in the car is incorrect. Where normal transmission operating temp on the gauge sits at about 3/4. For me the scale of the gauge needs to be adjusted for 'normal' operation. I'm sure Jeep will have allot less hassles from owners if this was the case.
The analog temp gauge in the GC is the Engine Coolant temp, not transmission temp. The tranny temp is available in the EVIC and is a digital readout display.
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  #45  
Old 11-18-2014, 05:40 PM
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Re: Transmission & Oil Temperatures

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Originally Posted by netboy View Post
The analog temp gauge in the GC is the Engine Coolant temp, not transmission temp. The tranny temp is available in the EVIC and is a digital readout display.
Thanks Netboy, yes, the engine coolant temp gauge and the fuel gauge are a fixed gauge on the instrument cluster. The transmission temp gauge is located in the menu in the EVIC. It should be a relatively easy re-program of the scale of the transmission gauge to reduce confusion. Just yesterday, my gauge was reading nearly 3/4 at 91C. Surely this is not 3/4 of maximum operating temp hence the confusion and this thread.
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