Transmission temperature

[goff1256]

I have a 1998 f53 chassis title as a 99 Winnebago with a V10 and my question is with an OBD2 ScanGauge where does it read the temperature before or after the transmission cooler if I remember correctly the transmission is a 4R 100

[Chum_lee]

Lwiddis wrote:
The fluid temperature in the transmission is the important number and that is where it’s taken.

Well, yes and no. Just like in an engine, the lubricating fluid temperature fluctuates throughout the transmission depending on the loading and what the fluid is doing. Typically the temperature probe is in a fixed location which isn't necessarily the location where the fluid is the hottest. The sensor measures the "average temperature" in a "convenient" location. So, even if you have a HUGE transmission cooler, it's a mistake to think that it sufficiently effects the fluid temperature in the hottest portion of the transmission. That's why it's important NOT to overload the transmission if you want it to last. If the ATF is showing signs of burning before your change interval is reached, chances are you are pushing it.

Chum lee

[WE3ZS]

Since the F-53 has a GVWR over 8500lbs (and if not originally sold in California) it was exempt from the otherwise fleetwide OBDII requirements of 1996. It will have the OBDII connection port and PCM but it is loaded with OBDI calibration.
Even with the OBDI calibration a plug-in device or dongle in the OBDII port should report the trans temp on a V-10 4R100 combo.
The above information does not appear to be very well known and has sparked many "debates" on various forums, but it is the reality of these early over 8500lb vehicles.
Here is a good thread with lots of info about the situation and what you may expect between the two calibrations both using the OBDII port and hardware. https://www.ford-trucks.com/forums/518596-wondering-why-your-mil-doesnt-come-on.html#post3889931

[theoldwizard1]

As stated, OBD-I uses a different connector from OBD-II. The method of communicating between the PCM and the test equipment is totally different.

Whether or not ScanGage can read the trans temperature depends entirely on the software inside the PCM. While trans temp is very common (especially in newer transmission) I don't believe it was EVER a FEDERAL requirement that the PCM have direct access to it !

On top of this, Medium Duty vehicle (F53) have different FEDERAL requirements.

[Dutch_12078]

MountainAir05 wrote:


My 99 and the 2000 ports are OBD2 our computers are OBD1. Port are located below the right knee. I have own it since new and It has been work on by Ford and at one time I had a letter from Ford stated that it was a OBD1 system on a 99 chassis. Had something to do that they were allowed to use up the old system to get them out of the system. I assure you I check it out with Newmar and DOT.

I'd love to see that letter... I've found nothing online so far that indicates Ford went to the extent it would have taken to re-engineer older OBD1 ECU's to work with a COP V10 with an entirely different sensor set. I'd think just releasing the remaining units in stock to the replacement parts market would have been much more cost effective. There are still plenty of 460's around that require new ECU's from time to time. If anyone can find more information about this, please post the links.

[RLS7201]

goff1256 wrote:
I have a 1998 f53 chassis title as a 99 Winnebago with a V10 and my question is with an OBD2 ScanGauge where does it read the temperature before or after the transmission cooler if I remember correctly the transmission is a 4R 100

Ford did not make a 1998 model year F53 chassis.
The 460/E40d F53 chassis was last produced in 1997.
The V10/4R100 F53 chassis came on line as a 1999 model year chassis.
1997 was the last of OBD-I on F53 chassis.

Richard

[theoldwizard1]

MountainAir05 wrote:
some 98 and 99 and 2000 Fords were ODB1. My 99 was and my neighbors 2000 is also ODB1.

If you have and OBD-II connector, you have OBD-II.

Not sure about the F53 chassis (which is considered a Medium Duty truck), but all light duty vehicle were required to have OBD-II in 1996.

There is no government "requirement" to monitor transmission fluid temperature.

[jerseyjim]

On a slight tangent here, I installed a transmission temp gauge on my dash.(2001 F-53/V-10). FWIW, the temp almost never seems to go beyond 160-170 degrees,

[MountainAir05]

Dutch_12078 wrote:

MountainAir05 wrote:

Dutch_12078 wrote:
All F53 stripped chassis used for motorhomes from model year 1999 on are equipped with a 6.7 L V10 engine and ODBII. That's the chassis model year, and not necessarily the same as the completed motorhome model year. There were some motorhomes with 1998, 1999, and possibly 2000 model years built on leftover 1997 F53 chassis equipped with a 7.4 L (460 cu in) engine with OBDI. There were no model year 1998 F53 chassis.

Your are welcome to come and check out two here, They are both Fords V10s and model 99 and 2000 and both show OBD1 using Fords and snap on equipment. They both were purchase new, Newmar and Fleetwood.

Where is the OBD port located? Can you post a picture of it? The OBDI port is completely different from the OBDII port.

My 99 and the 2000 ports are OBD2 our computers are OBD1. Port are located below the right knee. I have own it since new and It has been work on by Ford and at one time I had a letter from Ford stated that it was a OBD1 system on a 99 chassis. Had something to do that they were allowed to use up the old system to get them out of the system. I assure you I check it out with Newmar and DOT.

[Dutch_12078]

MountainAir05 wrote:

Dutch_12078 wrote:
All F53 stripped chassis used for motorhomes from model year 1999 on are equipped with a 6.7 L V10 engine and ODBII. That's the chassis model year, and not necessarily the same as the completed motorhome model year. There were some motorhomes with 1998, 1999, and possibly 2000 model years built on leftover 1997 F53 chassis equipped with a 7.4 L (460 cu in) engine with OBDI. There were no model year 1998 F53 chassis.

Your are welcome to come and check out two here, They are both Fords V10s and model 99 and 2000 and both show OBD1 using Fords and snap on equipment. They both were purchase new, Newmar and Fleetwood.

Where is the OBD port located? Can you post a picture of it? The OBDI port is completely different from the OBDII port.

[MountainAir05]

Dutch_12078 wrote:
All F53 stripped chassis used for motorhomes from model year 1999 on are equipped with a 6.7 L V10 engine and ODBII. That's the chassis model year, and not necessarily the same as the completed motorhome model year. There were some motorhomes with 1998, 1999, and possibly 2000 model years built on leftover 1997 F53 chassis equipped with a 7.4 L (460 cu in) engine with OBDI. There were no model year 1998 F53 chassis.

Your are welcome to come and check out two here, They are both Fords V10s and model 99 and 2000 and both show OBD1 using Fords and snap on equipment. They both were purchase new, Newmar and Fleetwood.

[Dutch_12078]

All F53 stripped chassis used for motorhomes from model year 1999 on are equipped with a 6.7 L V10 engine and ODBII. That's the chassis model year, and not necessarily the same as the completed motorhome model year. There were some motorhomes with 1998, 1999, and possibly 2000 model years built on leftover 1997 F53 chassis equipped with a 7.4 L (460 cu in) engine with OBDI. There were no model year 1998 F53 chassis.

Basically, if your diagnostics port is located on or near the steering column and has on over sized 'D' shape, it's an OBDII port. If it's located under the dog house cover in the engine compartment and has two parts, it's an OBDI.

[Lwiddis]

The fluid temperature in the transmission is the important number and that is where it’s taken.

[MountainAir05]

some 98 and 99 and 2000 Fords were ODB1. My 99 was and my neighbors 2000 is also ODB1. I could not get a scan gauge to work on ours or his. My info came from Ford many years ago , and no I do not still have it. It was posted here on the Forum, but that was back in the early 2000.

I just purchase a gauge and connected two sensors, one before and after the cooler with a switch. Worked good for us. Out here where we live in the summer we saw 150 plus towing a Saturn.

[Dutch_12078]

The 4R100 Transmission Fluid Temperature (TFT) sensor is located in the shift solenoid pack assembly, so it senses the fluid temp as it passes through the body of the transmission before it exits to the cooler.