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Unread 05-22-2013, 12:26 AM   #1
Bastler
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Join Date: Feb 2010
Location: Australia
Posts: 9
WJ Jeep Issues

Re-Post from ausjeepoffroad

2003 Grand Cherokee WJ Overland 4.7 HO

Hey all,

Been a long time since I have posted. My jeep basically has had issues since the day I bought it. Mostly due to me not being able to afford to fix it though.

MIL has been on since almost day one. P0700 was the initial code that it pulled. Since then i have had more.

The main issue however has been around for 2.5 years or so. Essentially my tranny overheats if I drive more then 50km or so the trans over temp light flicks on and my engine fan (assuming its my engine fan anyway) is going a million miles an hour. I was also having issues where the car felt slow to take off however this turned out to be a misfiring cylinder now thats all sorted the car actually seems to drive well.

Oil level is good coolant is good (however I think last time it was changed pure coolant was put in so i dunno how much damage that could cause but i think I will drain it and put the right mix in).

I have just taken the jeep to my mechanic and he serviced the oil cooler turns out it was pretty dirty and he said the pressure is a little low. I asked him to check the codes and he pulled the following;

c9 Line pressure low fault
38 torque converter clutch out of range
75 High temperature operation activated

He said to drive it for a bit and if the light comes back on bring it over straight away to see if they are the same codes if they are he will probably have to take the gear box out and service it.

It was also recommended for me to install and after market cooler in there however i was under the impression this was not a done thing in grands?

Thanks for any advice

Matt

Since this I have taken my jeep back to my mechanic and he is saying that the torque converter is slipping and he says the gearbox will need to be reconditioned to guarantee fixing it.

He wont be the actual guy doing the reconditioning he recommended a guy in Sydney they quoted my $3500 to do it. I dunno if this is a high price or average or what but it seems like a lot to spend on a car thats hardly worth 11k when in perfect condition.

I also dont want to sell it to someone with the light off and rip them off. I would sell it to a dealership as im sure they would do the same to anyone else but I dunno!

__________________________________________________ __________________________________________________ _______________
and today I found this...Customer Question

2002 4.7 V8 GRAND CHEROKEE
AFTER BEEN DRIVEN 40-50KM ENGINE LIGHT COME ON,LOGS CODE 38 TORQUE CONVERTER OUT OF RANGE,AND CODE 75 HI TEMPERATURE OPERATION ACTIVATED.
I CLEARED CODES BUT THEY COME BACK AFTER 40-50 KM DRIVE.
I TRIED TO RECTIFY PROBLEM BY DOING THE FOLLOING;
CARRIED OUT AUTO TRANS SERVICE AND CHANGED PRESSURE VALVE IN TRANS.
CHECKED FOR BLOKAGE AND FLOW RATE IN COOLER LINES.
REPLACED AUTOTRANS COMPUTER.
CHANGED VALVE BODY AND SOLENOIDS.
REMOVED NON GENUIEN BULL BAR FOR BETTER AIR FLOW.

Country: Australia
Make: Jeep
Model: Grand Cherokee Limited
Year: 2002
Engine: 4.7 V8 PETROL

Already Tried:
AUTOTRANS SERVICE INC FILTER AND PRESSURE VALVE,REPLACEMENT.CHECKED FOR BLOKAGE,AND FLOW RATE IN COOLER LINES.REPLACED AUTOTRANS COMPUTER.REPLACED VALVE BODY INCLUDING SOLENOIDS.REMOVED NONGENUIEN BULLBAR FOR BETTER AIRFLOW.
Submitted: 768 days and 1 hours ago.
Category: Australia Car
Value: 13
Status: CLOSED

Expert: Glenn Bradley replied 768 days and 1 hours ago.
Hi, it’s Glenn here. I can help you with your question.

Firstly CODE 38 TORQUE CONVERTER OUT OF RANGE is suggesting that the TCC is primarily slipping.
Common causes are a pressure loss due to:
TCC SOLENOID FAULTY
TCC SWITCH VALVE STUCK
TCC REGULATOR VALVE STUCK
INPUT SHAFT SEAL RING DAMAGED
OR
TORQUE CONVERTER CLUTCH FAILURE

This slip will increase fluid temp and may well be the reason for CODE 75 HI TEMPERATURE OPERATION ACTIVATED.

The car needs to be driven with the scan tool connected to watch live data and then pressure tested.

How many km's has the car done?
Was the pan clean when removed for last service?
Has the transmission had regular service throughout the car's life?

Cheers Glenn
Customer replied 768 days ago.
GLENN!
THANK YOU FOR YOUR HELP,AS I SAD THE VALVE BODY BEEN REPLACED,WITH ALL THE SOLENOIDS,AND SENSORS INPUT AND OUTPUT,WHEN I SERVICED THIS TRANSMISSION IT WAS CLEAN,AND I USED GENUIEN FLUID,I SERVICED THIS CAR SINCE NEW AND IT WAS SERVICED REGULARLY,BY THE BOOK.THIS CAR TRAVELLED 136414KM AS TODAY.
Customer replied 767 days and 23 hours ago.
GLENN!
JUST TO POINT YOU MORE IN THE RIGHT DIRECTION,SOME TIME THE AUTOTRANS HI TEMPERATURA LIGHT COME ON THE DASH WITH THE ENGINE LIGTH,BUT THE OIL DON'T GET BURNT AT ALL,FIRST WE THOUGHT IT MUST BE A FAULTHY TEMP SENDER ,BUT AFTER THE TEMP SENDER BEEN CHANGED THE PROBLEM STILL THE SAME.WE CHECKING THE OIL AND IT'S NICE AND CLEAN NO SIGN OF OVER HEATING. WHEN THE TEMPERATURA LIGHT COME ON I SWITCHED THE OVER DRIVE OFF AND THE LIGHT TURNED OF AFTER 30-40 SEC.I'M NOT SURE IF THIS WILL HELP, BUT HOPING IT MAY GIVE YOU SOME IDEAL.
MANY THANKS JOE.
Accepted Answer


Expert: Glenn Bradley replied 767 days and 23 hours ago.
Hi Joe, thanks for the extra info.

Switching the O/D off turns off the torque converter clutch so that may explain why the light goes out as the slipping stops.

When in 2nd, through 5th gear, the torque converter clutch (TCC) can be engaged when certain conditions are met. The L/R-TCC piston is electronically modulated by increasing the duty cycle of the L/R-TCC Solenoid until the torque converter slip difference (difference between engine and transmission input speed) is within 60 rpm. Then the L/R-TCC solenoid is fully energized (FEMCC - 100% duty cycle). Torque converter slip is monitored in FEMCC to ensure adequate clutch capacity.

You either have low TCC pressure there or what I'm thinking is a failed torque converter clutch lining that is causing too much slip and an increase in fluid temperature, the fluid can overheat but it does take a while to burn.

If the car was in my shop I would test the pressures and then remove the transmission, replace the torque converter and probably pop the pump out and take a look inside the transmission to be sure that it's ok too.

Cheers GlennGlenn Bradley40602.1338812153
Expert Type Australian Car Mechanic
Category: Australia Car
Pos. Feedback: 99.4 %
Accepts: 639
Answered: 2/28/2011
Experience: Ex Transmission Shop Owner, Driveline Specialist, 30+ years in the Australian Automotive Industry
Ask this Expert a Question >
__________________________________________________ __________________________________________________ _______________


Sorry for the huge post but im lost on what I should do.

Matt

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Unread 05-22-2013, 04:45 AM   #2
michiganmaveric
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I don't know if prices are higher in Aus., but I had mine completely rebuilt with all new parts and sensors plus a rebuilt torque converter for $1800.
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