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Unread 07-29-2011, 11:21 PM   #1
kfxnando
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Join Date: Sep 2010
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p0700 when cold

Hi

have had the jeep for about 10months, and over that perioud have noticed a p0700 is activated when cold
1st time when it happened, posted a question on jf and did other reading, ended pulling out the speed sensors and checking the out with a millimeter and gave them a clean, while I did this the battery was disconnected and hence the would disappeared


as our winter arrived temp fell and the one morning it appeared again, thought will just disconnect battery and recollect, it did not help, so went the dealer to do a diagnostic and a reset. They found nothing wrong and reset the code

the jeep is not a dd so it takes a while to see patterns
a few back when temp were around the 32*f when we got in started it and wanting to drive away found something that we had noticed before, that when very cold the drive to the gearbox feels as if slipping, stopped outside a friends house (about 200m away) shut it off and after a few min chat left and again it sounded like a lot of slipping

drove about 2km to the fuel station and it was a bad drive, could of even gone into limp mode
there I bought a 13mm spanner disconnected the battery, and when I drove off all was fine, however the p0700 was still there, later after leaving the battery disconnected
for awhile the fault code cleared
what we do now is start the jeep and let iddle for a few min till the engine temp moves off the cold mark, asthe gearbox oil flows through the radiator the gearbox is no longer ice cold

have bought oil and filters for the gearbox, and plan on doing it soon
gears change mostly very smooth, that the only way to know that a gear has changed is to watch the rev, except sometimes there is a funny chance between 2nd and 3rd, although seldom

now is there any thing else that I need to worry about or will the oil and filter change solve the issue
is there anything else that I need to look at while the gearbox pan is off

have no idea off it was looked after by previous owner or what fluids were used
have no idea of the millage as the cluster was replaced

and its a wj V8


all advice and comments will be welcome and appreciated

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Unread 07-30-2011, 10:44 PM   #2
kfxnando
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Anyone? ?
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Unread 08-01-2011, 10:12 AM   #3
kfxnando
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surely someone in the house can shed some light on this one

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Unread 08-03-2011, 01:57 AM   #4
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Please .
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Unread 08-03-2011, 05:37 AM   #5
Baitis
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Problem sounds identical to the below TSB but for later models. This doesn't mention temperature but cold flow of fluid definietly fits in:

NUMBER: 08-016-05
GROUP: Electrical
DATE: March 03, 2005
SUBJECT:
TCM Internal Fault May Cause A Low Line Pressure or Gear Ratio Error DTC

OVERVIEW:
This bulletin involves: verifying if a low transmission line pressure condition is/was present, replacing the Transmission Control Module (TCM) if necessary, and inspecting for possible transmission clutch disc wear.

MODELS:
2004 (WJ/WG) Grand Cherokee2004 - 2005 (KJ) Cherokee (International Market)2005 (KJ) Liberty NOTE :This bulletin applies to a Grand Cherokee, Liberty, or Cherokee equipped with a 545RFE automatic transmission (sales code DGQ) and built on or between April 07, 2004 (MDH 0407XX) and February 27, 2005 (MDH 0227XX).
SYMPTOM/CONDITION:
The customer may notice that the Malfunction Indicator Lamp (MIL) has illuminated and that the transmission may be in "Limp-In" mode. Further investigation by the technician may reveal that the MIL illumination may be due to transmission Diagnostic Trouble Codes (DTC's) relating to either a "Low Line Pressure" fault and/or to a "Gear Ratio Error" fault. This condition may be intermittent. If a DTC has occurred then "DTC Event Data" relating to the respective DTC will have been captured and logged in the TCM and may be obtained using the DRB III(R) scan tool.
DTC's That This Condition May Cause:
P0868 - Line Pressure Low.
P0731 - Gear Ratio Error In 1st.
P0732 - Gear Ratio Error In 2nd.
P0733 - Gear Ratio Error In 3rd.
P0734 - Gear Ratio Error In 4th.
P0735 - Gear Ratio Error In 5th.
P0736 - Gear Ratio Error In Reverse.
P1736 - Gear Ratio Error In 2 prime.
The cause of the above condition may be due to an internal electronic circuit failure within the 1CM. The Grand Cherokee vehicles equipped with a 545RFE transmission will have either a 4.7L or 4.7L H.O. engine. Liberty and Cherokee vehicles equipped with a 545RFE transmission will have a 2.8L diesel engine. This bulletin DOES NOT apply to vehicles equipped with any other type of automatic transmission.
DIAGNOSIS:
The build date of the TCM must be inspected for a specific build time (range). The suspect build range is from April 04, 2004 (Julian date of 0984 where: "098" = day of year, and "4" = 2004) to February 09, 2005 (Julian date of 0405 where: "040" = day of year, and "5" = 2005). Any TCM built between Julian dates 0984 to 0405 may be suspect if one or more of the above DTC's have occurred.
The above date codes (Julian dates) are displayed on the bar code label that is affixed to the outside of the TCM. The bar code will be an eleven (11) digit number. Read the third (3rd) through the sixth (6th) digit to determine the date of build of the TCM. An example of a bar code number is "H098412345". "TH" represents the type controller and vendor. "0984" represents the date code that the TCM was built using the Julian date coding method. "12345" represents the unique serial number for the sequence of build of the controller for the specific Julian date (day).
1.Verify that the build date code on the TCM falls within the suspect build date range of 0984 to 0405. If the vehicle TCM date code falls within the suspect date range proceed to the next step. If not, then this bulletin does not apply and further diagnosis is required.
2.If DTC P0868 is present, then perform the Repair Procedure. If not, proceed to the next step.
3.If the DTC is one of the above "Gear Ratio Error" faults listed above, then proceed to the next step. If not, then this bulletin does not apply and further diagnosis is required.
4.Using the DRB III(R) scan tool, check the "DTC Event Data". Is the "Line Pressure" reading displayed in the "DTC Event Data" within 103 Kpa (15 psi) of the "Desired Line Pressure" reading? If yes, then this bulletin does not apply and further diagnosis is required. If the "Line Pressure" reading is 103 Kpa (15 psi) or more below the "Desired Line Pressure", then perform the Repair Procedure.




PARTS REQUIRED:




SPECIAL TOOLS/EQUIPMENT REQUIRED:
NOTE :An updated J1962 cable has been released. This cable has a red colored connector at the DRBIII(R) connection.
REPAIR PROCEDURE:
1.Disconnect and isolate the negative battery cable from the battery.
2.Replace the Transmission Control Module (TCM).
3.Connect the negative battery cable to the battery, set the clock to the correct time, and clear any TCM DTC's which may be present.
4.Using the DRBIII(R), compare the "Actual Line Pressure" reading to the "Desired Line Pressure" value (goal) with the vehicle in Park and the engine running at 1,500 RPM.
5.If the "Actual Line Pressure" reading is less than the "Desired Line Pressure" value by 103 Kpa (15 psi) or more, then further diagnosis and repair of the transmission will be required. Refer to NOTE below.
6.The transmission line pressure is considered good/normal if the "Actual Line Pressure" reading is within +/- 34 Kpa (+/- 5 psi) of the "Desired Line Pressure" value. Momentary small fluctuates in "Actual Line Pressure" greater than +/- 34 Kpa (+/- 5 psi) may occur. If the "Actual Line Pressure" reading is within +/- 34 Kpa (+/- 5 psi) of the "Desired Line Pressure" value, proceed to the next step.
7.Using the DRBIII(R), perform a 1st Gear Clutch Test and a Reverse Gear Clutch Test. If either test fails (input speed does not remain at zero), then further diagnosis and repair of the transmission will be required. Refer to NOTE below.
8.If the 1st Gear Clutch Test and the Reverse Gear Clutch Test pass, then proceed to the next step.
NOTE :If the "Actual Line Pressure" is below specification (less than 103 Kpa / 15 psi) of the "Desired Line Pressure, or if either the 1st Gear Clutch or the Reverse Gear Clutch Tests fail, then repair to the transmission may be required. Remove the transmission, inspect the clutches and repair as necessary. Often corrective action may only involve repair to a specific set of clutch discs and separator plates (clutch pack). Possible repair to the transmission is not addressed by this Service Bulletin.
NOTE :If the transmission requires disassembly for repair to mechanical components, verify that the pump gears are intact and that the main regulator valve (located in the pump valve body) moves freely in its bore.
9.Using the DRBIII(R), perform the transmission Quick Learn Procedure.
10.Perform the transmission diagnostic Verification Procedure. Refer to TechCONNECT for detailed instructions, Diagnostic Tab, 7.0 Diagnostic Information and Procedures, 7.3 Verification Tests.
NOTE :If any of the above listed DTC's reoccur after performing the Quick Learn and Verification Procedures, then further transmission diagnosis and repair will be required.
POLICY:
Reimbursable within the provisions of the warranty.




TIME ALLOWANCE:

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Unread 08-05-2011, 12:57 AM   #6
kfxnando
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Thanx very much for the info, can't make sense of the diagram yet, will need to have a much better look at it

not saying that it could not be the same thing, however, the bulletin is for 2004 and 2005
from my understand I was under the impression that those gearboxes were all the same, maybe the years mentioned were supplied with defective parts

thanx any case for the reply
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Unread 08-05-2011, 03:17 AM   #7
Baitis
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Although the bulletin is for my 04 it just means they got parts from the low bidder and I'll see the failures more frequently. From a troubleshooting perspective it seems to fit your problem. The troubleshooting method probably applies to any trans with a TCM but it's not something that shows up in the shop manual.
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Unread 08-06-2011, 03:41 PM   #8
kfxnando
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Baiting, thanx very much for all the effort
on Friday went to a local auto gearboxes specialist, and had a lengthy chat with one of the techs, he sounded very knowledgeable, he seems to point in only a slight different direction, he does not look at the control unit, however the parts that the control unit controls, he say from his experience and all that i described it sounded like the solonoid pack

this is not final, will be consulting with other local auto gearboxes specialist, and in the end the steamers as well

will also check locally to see what is the reputation of the various auto box specialists

then will need to decide if I will do it self or have it done, sounds like cheap enough on labour

thanx very much for info, highly appreciated, will post as developments happen, and feel free to shoot if there are any more ideas
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