Technical Car Experts Answers everything you need: inspecting transmission problem

Showing posts with label inspecting transmission problem. Show all posts

Tuesday, July 3, 2012

Transmission-Hard To Down Shift

The Issue Noticed on 2002 Chrysler Concord.Vehicle downshift gets hard and Error code P0700 and P1776 are retrieved.

What are this OBD codes indicating to Inspect?

The OBD error code P0700 just sets in the engine controller when a code sets in the transmission controller.
This code indicates you to get the Transmission controller checked.
It tells you that there is another code set in the Transmission module.This error code P0700 is nothing to worry.

But Error code P1776 sets when the solenoid switch valve in the transmission gets stuck in the low/reverse position or the transmission controller thinks that it does.

OK,WHAT CAN I DO IN THIS SITUATION AND WHY THIS PROBLEM IS CAUSED?

There are a few things that will cause this error code to occur:---
I will explain you those issues and possibilities.

Possibility Number 1:---

It could be the solenoid switch valve that is actually sticking.

OK,BUT WHERE IS THIS VALVE?

The solenoid switch valve is in the valve body inside the transmission.

OK,SHOULD I REPLACE THE VALVE OR IT CAN BE REPAIRED?
If it's sticking sometimes the bore can be polished to repair the problem, sometimes the valve body would need to be replaced to cure it.If its worn out and very old,i suggest getting it replaced.Because cleaning the valve will just be the temporary option to resolve the issue.The permanent solution is to replace the valve.

Possibility number 2:---------

It could be the low/reverse pressure switch.

Where is Pressure switch located?
The pressure switch is located in the solenoid pack mounted to the top of the valve body.

SO SHOULD I REPLACE SOLENOID PACK OR PRESSURE SWITCH?

There were many solenoid packs identified that had suspect pressure switches and would set this code when the switch failed. A failed pressure switch is the most common cause of this code on your vehicle, which would require solenoid pack replacement.

OK,ANY OTHER POSSIBILITY OTHER THEN THIS?
Yes there is one more possibility,that can also cause such issues and set this P1776 error code.
It could be a wiring issue between the transmission and TCM(the controller module). If the low/reverse pressure switch wire shorts to ground any time the trans is in third or fourth gear with the converter clutch on then this code can set. Wiring isn't that common but does happen once in a while.
So if all above possibilities checked ok,then dont forget to inspect the wiring possibility.A loose or shorted/melted wiring or wire got crimped/pinched in between.

This details will help you.
Thanks.

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Monday, July 2, 2012

2002 Dodge PT Cruiser: OBD Error Code P0700 & P0725

Transmission won't shift out of second gear.Scan test showed error code P0700 and P0725.

Why error code P0700 comes up?

The OBD error code P0700 just sets in the engine controller when there is a code stored in the trans controller. The P0700 is only there so you read the codes from the trans controller and it turns the engine light on. The P0725 is the one that points to the actual problem.

What Exactly code P0725 points or indicates to check?

The OBD error code P0725 sets when the transmission controller (TCM) isn't seeing a signal from the crankshaft position sensor.

What is Crank sensor's operation procedure and where it is located?

The crank sensor is on the engine block and it's main purpose is to tell the engine controller (PCM) where the crank is in it's rotation and how fast it's spinning. Since the TCM also needs to know exactly engine RPM in real time, it also looks at the crank sensor's signal through a hard wired input.

SO,in this case should i replace Crank Sensor?
NO,If you aren't having any drive ability problems and there isn't a P0320 set in the PCM then you can rule out an actual failure of the crank sensor. If the crank sensor wasn't working the you would be losing spark.And in Error code scan,you should have got Error code P0320.

OK, So what is problem is my case and What test or troubleshooting should i do?

As per your problem description the possible causes for the P0725 setting are the TCM, which is possible but not that likely, or issue with wiring. Not Crank sensor but the crank sensor signal wire between the splice and the TCM is open so the TCM can't see the signal. Which is quite possible.

As per my suggestion and recommendation .What would need to be done is test the wiring at the time the actual problem is noticed. If the circuit is open then either the harness would need to be opened up to find and repair the break, or the circuit could be hardwired and overlay the old harness, which would be quicker and easier.
But in both case first to confirm the issue,let the problem arise so once the transmission is stuck up in 2nd gear,then get the possibilities inspected and tested.

This details will help.
Thanks.

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Thursday, June 28, 2012

2004 Dodge Ram: Transmission Not Working?

Solution For repairing Transmission Problem.

CASE HISTORY:---
Vehicle was driving fine.After getting over the bump the vehicle jerked and transmission stopped operating.

The engine whines while start up but tranny will not operate.

SOLUTION FOR TROUBLESHOOTING IS AS FOLLOWS:------

First thing to check in this case is Transmission fluid level.
Try this test to confirm the fluid level.

With the engine off remove the dipstick and note the exact fluid level on the stick. It will be substantially over the full mark since the engine isn't running.
Now test the fluid level again ,but this time start the engine for few minutes.Then wait for one more minute.
Then check the fluid level again and see where it's at.

Did the level stay the same? Did it drop?

If in the the first test vehicle fluid level is at cool level and after starting engine the vehicle fluid level shows at hot fluid level.Then its advisable to get the fluid replaced.

But if fluid level is checked ok and its full then,smell the fluid,is it smelling burnt or is it very dirty fluid.IF yes then also get the fluid changed.Get the transmission system flushed and fluid replaced.The burnt fluid is indication that transmission clutch system is getting worn out.The clutch needs to be inspected.

But if that is also not the case and fluid is clear and not burnt smell.
Then see if you get any steady check engine light ON dash.
If yes then get the error codes scanned.
The code will tell us what part is causing the problem.

But if there is No check engine light on dash.
Then its not error code issue.

In that case test the relays in the fuse box,.If the relay is faulty,it has to be replaced.

In the fuse box under the hood find the trans relay. (relays are the larger black square objects). See the condition of relay,if it looks worn out and blown/shorted then replace it.But if relay looks good then,With the relay out start the truck and see if the trans will engage then or if it still won't move.
If it engages with relay out,then its faulty relay, replace it.

But if with the relay out,the problem is same then reinsert relay where it was.

Now manually try pushing the truck.With the trans in park are you able to push the truck, or do you feel a mechanical lock preventing the truck from moving?
If its transmission problem you will feel that vehicle is hard to push and it feels like locked.

If you feel the vehicle is hard to push with trans is park mode.
Then You've definitely got an internal trans issue of some sort then.

The previous test we did clears that

The pump is pulling fluid from the pan, which is a good sign.
It's also a good sign that the fluid isn't burnt, normally if there was clutch damage then the fluid would be burnt.

On this basis it indicates that problem can be like failed clutch, geartrain component or broken/stripped shaft in the transmission.
To confirm the issue further I recommend is removing the pan and having a look at the accumulator cover.
Remove the cover and inspect the undercover pistons.
On the right side of the valve body there is a steel plate that runs from the front to back, this cover holds all the accumulator pistons in the valve body. The plate is held on with Torx screws and sometimes the screw heads will shear and the plate bends, this allows pistons to come out and you will lose certain clutches depending on what piston falls out. If your underdrive piston falls out then it's not going to move.

If you notice any of this issues then the repair simply involves removing the valve body and installing a repair kit from your dealer. The kit comes with a piston, seals, screws and the cover.Replacing the parts will solve the issue.

BUT after you remove the accumulator cover and all looks clean and absolutely fine and all pistons are tight intact.Then its not the valve body issue.
If this does look ok then unfortunately the trans will have to be further disassembled to see what has happened. Any internal failure on these is uncommon, but if your fluid isn't burnt at all then if there actually is an internal failure then a geartrain component or shaft seems most likely. Let's hope it's the accumulator cover.
Because the repair cost will be less.
But if its internal issue with transmission mission then cost will be much expensive and proper transmission rebuilt auto shop will be required to get the exact cause detected.

This details will help.
Thanks.

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Saturday, March 10, 2012

Transmission is shifting erratically?

Erratic shifting noticed while driving.

In this problem,there are few possibilities,that are to be checked and inspected.

The list of possible parts to be inspected are as follows :----

Inspect & Check Transmission Modulator(Automatic).If Modulator Is Leaking Fluid into the Vacuum System the Erratic transmission shifting will be noticed.

Inspect & Check Transmission(Capacity).If the transmission Fluid Level Incorrect then erratic Shifting will be noticed.

Inspect & Check Transmission Fluid Type.If Transmission fluid is Contaminated Or wrong Transmission Fluid is filled then Shifting problems will be noticed.

Inspect & Check Transmission Filter (A/T).A Clogged or Dirty Transmission Filter can cause shifting problems.

Inspect & Check Automatic Transmission.In some cases Its Internal Transmission Problem.This has to be checked by Proper transmission repair service shops.

This will help.

Thanks.

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