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Torque » Torque OBD ECU Scanner » Torque Discussion / Ideas » 2005 Grand Cherokee Trans temp and Oil Pressure

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Author	Topic: 2005 Grand Cherokee Trans temp and Oil Pressure

muddyjgc

Member
Posts: 10

2005 Grand Cherokee Trans temp and Oil Pressure
on: January 11, 2014 (GMT)

Hello, first I have to say that this is and awesome app. It works great with my 2000 F-250 7.3 Powerstroke and my 2013 Chevy 1500 work truck. The vehicle that I really purchased Torque for is my 2005 Grand Cherokee with the 4.7 V8, and I am unable to get a transmission temp or oil pressure readings. I have read every post about Jeep transmission temps and tried the all the predefined PID’s but none of them work I also tried the wakeup command. One gives me the coolant temp, even when in drive, another stays at -40 and another stays at 32 and the last one stays blank. Oil pressure isn’t even listed as an option but I would like to have it.

Has anybody out there had any luck getting these to work on a 05 Grand Cherokee

Capp777

Member
Posts: 2994

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: January 13, 2014 (GMT)

Have you tried running Torquescan to
see if it identifies any extended pids
(mode 21 and mode 22 pids)?

muddyjgc

Member
Posts: 10

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: January 14, 2014 (GMT)

I have tried to run a scan several times but the program crashes after about a minute. I don’t know if this is a problem with the program/my phone or my reader. I have submitted crash reports.

thebeast

Member
Posts: 4

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: January 25, 2014 (GMT)

Was there anything that came of this??

I also have a 2005 grand cherokee and I can’t seem for the life of me be able to get the transmission temp working.

any help with pid ideas or anything….I am willing to try to make this work

Capp777

Member
Posts: 2994

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: January 26, 2014 (GMT)

Have you tried any of the Dodge
pids? Some Dodge owners have
had success with the Jeeps.

muddyjgc

Member
Posts: 10

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: January 27, 2014 (GMT)

All the Jeep, Dodge, and Chrysler pids are in the same group and I have tried them all with no luck. I still can’t get the scan to work either, it keeps crashing the program.

thebeast

Member
Posts: 4

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: January 27, 2014 (GMT)

I have also tried all the existing dodge/jeep pids in the app with no luck.

I am guessing that the pid is different for this particular model jeep.

I was scouring the service manual and I know that there is a sensor in the transmission that reports to the TCM as well as to the ECU what the temperature is in the transmission.

so we just need to figure out how to get the app to read the data.

any help is appreciated,

thebeast

Member
Posts: 4

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: January 29, 2014 (GMT)

Here is the info from the manual

Theory of Operation

The Electrohydraulic Control Unit Assembly of the NAG1 transmission contains a temperature sensor to monitor the
transmission oil temperature. This sensor is wired in series with the transmission Park/Neutral switch. The Transmission
Control Module (TCM) expects to see a valid voltage level from the sensor when the shifter is in Reverse
or any forward Drive position. The TCM also expects to see an open circuit condition when the shifter is in the Park
or Neutral position. When the controller detects an open circuit when in Reverse or any forward drive position the
DTC will set. Note: Due to a open circuit condition in Park or Neutral, the TCM substitutes the Transmission Temperature
reading with Engine Temperature when in Park or Neutral.

Not sure if it helps or not????

muddyjgc

Member
Posts: 10

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: January 30, 2014 (GMT)

Some people have reported that the trans temp does work when in drive but showing the coolant temp when in park. Unfortunately that is not the case for me. I’m not sure if those people have the NAG1 transmission (came with V6’s) or the 545RFE (came with V8’s). I have the 545RFE.

This is from the service manual for the 545RFE…

Theory of Operation
The Transmission Temperature Sensor is a variable resistor that changes with temperature, or otherwise known as
a thermister. The temperature of the transmission fluid can affect a variety of electronically controlled transmission
operations such as shift quality, torque converter lock-up, and when and/or if certain OBDII or system self-diagnostic
test are performed. The Powertrain Control Module (PCM) substitutes a calculated transmission temperature value
if a fault is detected in the Transmission Temperature Sensor circuit.

thebeast

Member
Posts: 4

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: January 31, 2014 (GMT)

Quote from muddyjgc on January 30, 2014
Some people have reported that the trans temp does work when in drive but showing the coolant temp when in park. Unfortunately that is not the case for me. I’m not sure if those people have the NAG1 transmission (came with V6’s) or the 545RFE (came with V8’s). I have the 545RFE.

This is from the service manual for the 545RFE…

Good catch….I also have the 545rfe…..I guess I haven’t been much help at all yet

I am still bound and determined to make this work

I have been in touch with the people at Dashboss and they assure me…I can get tranny temp using their product and app….I am committed to Torque for now as I have spent my money on this app and so I want to exhaust all avenues before I give up on it

muddyjgc

Member
Posts: 10

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: February 1, 2014 (GMT)

The 4.7/545rfe is in the Dodge Ram, Dakota’s, and Durangos. Surly the systems in these are similar. I wonder if anybody with those have the same problems.

Capp777

Member
Posts: 2994

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: February 1, 2014 (GMT)

Have you searched those vehicle specific
forums to see what they are using for
TFT pid.

Its there… but someone has to find it.

Capp777

Member
Posts: 2994

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: February 1, 2014 (GMT)

Have you tried any of these pids
yet…

http://torque-bhp.com/forums/?wpforumaction=viewtopic&t=3142.0

muddyjgc

Member
Posts: 10

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: February 2, 2014 (GMT)

I just tried both 22A01B and 22B011 PID’s. Both of them get a response of some sort but return results of 0.

PId scans are still crashing the program after a minute or two.

Capp777

Member
Posts: 2994

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: February 2, 2014 (GMT)

Have you reviewed the mode
21 link to see if their trucks
matched your trans?

The 2007-2011 Jeeps used 22B010
which was one less than the Rams.

muddyjgc

Member
Posts: 10

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: February 3, 2014 (GMT)

Yea, I tried Pid’s 2124 & 2172. Both return a no response.

I assume that I am setting them up right. Here is what I put in.

PID: 2124
Long Name: Trans Temp
Short Name: TFT
Man Value: 0
Max Value: 300
Sale Factor: 1
Unit Type: F
Equation: ((A*256)+B)*(1/64)

I also tried 07E02124 for the PID.

Capp777

Member
Posts: 2994

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: February 4, 2014 (GMT)

Can you tell me what header
value you are using…

7E0 is a CAN header and I suspect
your 2005 is not CAN.

I think ISO 9141 uses something like
C410F1.

You can verify your vehicle protocol
by looking under adapter status from
mainscreen.

muddyjgc

Member
Posts: 10

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: February 4, 2014 (GMT)

It uses ISO15765-4CAN 11/500
I believe Jeep went to a CANBUS system in the early 2000’s.
I have been leaving the header field blank. Should I be putting something in?

Capp777

Member
Posts: 2994

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: February 4, 2014 (GMT)

If its can you could try
7E0; 7E1, 7DF, Auto or
blank.

muddyjgc

Member
Posts: 10

Re: 2005 Grand Cherokee Trans temp and Oil Pressure
on: February 4, 2014 (GMT)

Something interesting that I just read over in the Superchips Forums. Somebody with a Hemi 05 Grand Cherokee was asking about the lack of tranny temp. Superchips responded that the PID would have to be activated at the dealer in order to read it. I have never heard of that, do you think that could be the “wake-up” command that some jeeps have to give in order to see the tranny temp?

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