Shift Solenoid E intermittent

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Old 28 Jun 2006, 04:22 pm   #1 (permalink)
Pal
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Default Shift Solenoid E intermittent

Hi,

My 97 camry with 142k miles has the check engine light on, it comes on
and off every now and then. I took the car to dealer and they say the
car has Shift Solenoid E intermittent faiures and nned to be replaced.
Could anyone tell me what is its function and what could happen if I
don not replace it.

Thanks,
Pal.

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Old 28 Jun 2006, 08:46 pm   #2 (permalink)
Daniel
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Default Re: Shift Solenoid E intermittent

Pal wrote:
> Hi,
>
> My 97 camry with 142k miles has the check engine light on, it comes on
> and off every now and then. I took the car to dealer and they say the
> car has Shift Solenoid E intermittent faiures and nned to be replaced.
> Could anyone tell me what is its function and what could happen if I
> don not replace it.

==================
Ever change the transmission fluid?
The transmission is shifted electronically by the engine control
computer.
The ECM sends an electrical signal to the shift solenoids to alter
fluid pressure in the valve body of the transmission applying pressure
to different clutch plates to engage the different gears.
Perhaps if the fluid is old and worn, one of the solenoids is beginning
to stick. Another possiblity would be a loose or dirty electrical
connection on the outside of the transmission.
I suppose if one of the shift solenoids completely ceased to function,
you would lose the use of some of the gears.

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Old 28 Jun 2006, 09:56 pm   #3 (permalink)
m Ransley
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Default Re: Shift Solenoid E intermittent

Did you ever change the transmission filter, try that first.

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Old 29 Jun 2006, 08:44 am   #4 (permalink)
Daniel
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Default Re: Shift Solenoid E intermittent

Pal wrote:
> Hi,
>
> My 97 camry with 142k miles has the check engine light on, it comes on
> and off every now and then. I took the car to dealer and they say the
> car has Shift Solenoid E intermittent faiures and nned to be replaced.
> Could anyone tell me what is its function and what could happen if I
> don not replace it.

=================================
A solenoid has an electromagnetic coil and a plunger that moves when
current is applied.
Another common example would be the solenoids in the power door locks.
In the transmission, the fluid has two somewhat contradictory
functions.
1) It has to lubricate the moving parts including gears and bearings.
2) It cannot be so slick that it prevents friction between the clutch
plates that engage to create different gear ratios.
Because there is friction between the slipping clutch plates in an
automatic transmission, heat is generated. Heat can cause lubricants to
"break down" chemically and begin to create varnish which is a thin
tough sticky film instead of a smooth slippery one.
Also, as the clutch plates wear, (presumably more quickly with degraded
fluid) those particles of worn friction material circulate in the
transmission fluid.
That's why it is a good idea to drain the fluid regularly. There is
actually a drain plug on the bottom of the pan, which makes this
simpler, but it does not remove all the fluid, so you need to repeat
several times. For the small extra cost, I recommend changing the
aluminum drain plug gasket each time. That way you're compressing a
fresh gasket to get a good seal.
The main trick to changing transmission fluid is to get the final level
correct.
The fluid expands when heated, so the car needs to be driven at least
ten miles before the final check, but not run at high speed, or slow
stop and go traffic with the air conditioner on, prior to checking.
I've found the best practice is to pour the drained fluid into measured
containers, like many empty oil bottles with "ounce" markings on the
side, then refill the exact same quantity before making the final
check.
Because most transmission failures are related to "burned" fluid, I use
Mobil 1 fully synthetic ATF because synthetic fluids are much more
stable at higher temperatures.
I have also found 8 oz. of Lucas transmission fix helpful, added at
each oil change.

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Old 29 Jun 2006, 10:11 am   #5 (permalink)
m Ransley
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Default Re: Shift Solenoid E intermittent

Just draining is not enough, a clogged filter reduces oil flow where it
is needed.

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