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Old 01-24-2011, 02:33 PM   #1 (permalink)
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Default AT Temp Flashing

This morning (1 degree out according to my thermometer) my AT Temp light started flashing on my way to work. The trans seemed to be acting normally for a cold morning, shifting slowly until warmed up and then shifting normally. After a couple of miles I pulled over and shut the car off. When I restarted it the light stayed off and everything was normal. At lunch I went out to run an errand and the trans is shifting like a HiPo Mustang with a shift kit..... it felt like it actually chirped the rear tires. Then, again, the AT Temp light starts flashing again. After driving a couple of miles the light goes off and is acting normal again..... WHY?!?!?
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Old 01-24-2011, 02:34 PM   #2 (permalink)
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Check your fluid level
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Old 01-24-2011, 03:35 PM   #3 (permalink)
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Yes, that would make sense..... would that cold make that much difference though?
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Old 01-24-2011, 05:11 PM   #4 (permalink)
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try this
copied from another site


In any event, the flashing AT Oil Temp light indicates that the Transmission Control Module (TCM) has detected a problem and is trying to tell you about it. Here's the procedure for interrogating the TCM for the 2002 Impreza (all variants). It's one of those secret handshake procedures reminiscent of the pre-OBD ECU days. I swear I'm not making this up.

1) Warm up the engine
2) Turn the ignition switch OFF
3) Turn the ignition switch ON
4) Start the engine
5) Drive the vehicle at speeds greater than 12 MPH
6) Stop the vehicle
7) Depress the brake pedal and move the gear selector to "1"
8) Turn the ignition switch to OFF
9) Turn the ignition switch to ON
10) Move the gear selector to "2"
11) Move the gear selector to "1"
12) Move the gear selector to "2"
13) Move the gear selector to "3"
14) Move the gear selector to "D"

Now examine the AT Oil Temp light again:

If the light's blinking 4 times a second, then the problem is most likely a power supply or ground problem.

If the light's blinking 2 times a second, then the TCM believes all is normal.

If the light's on solid or not on at all, then there's a problem with the light's circuit.

If the light's blinking with one or more long (1.2 sec) pulses, followed by one or more short (.2 sec) pulses followed by a 1.5 sec pause, then you're seeing a TCM diagnostic trouble code (DTC). The long pulses indicate "tens" and the short ones indicate "ones" so you add up the number of long pulses to get the left digit of the DTC and you add up the number of short pulses to get the right digit of the DTC. DTCs are two digits long (e.g. 23, 36, etc.). The end of the "ones" is indicated by a 1.5 second pause. Then, if that is the only DTC stored, it begins repeating that DTC with the "tens" again. However, there may be more than just one DTC stored, in which case they are spit out sequentially with 1.5 sec pauses between them, until the whole sequence repeats again.
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Old 01-24-2011, 05:20 PM   #5 (permalink)
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I have some swamp land in Florida if your interested LOL
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Old 01-24-2011, 07:01 PM   #6 (permalink)
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here's another




Once and for all, let's start some How Tos. This one should be how to pull transmission codes. We should do another one for ABS codes.

So, here is how to read transmission codes using the "secret handshake" method.

Quote:
1) Warm up the engine
2) Turn the ignition switch OFF
3) Turn the ignition switch ON
4) Start the engine
5) Drive the vehicle at speeds greater than 12 MPH
6) Stop the vehicle
7) Depress the brake pedal and move the gear selector to "1"
8) Turn the ignition switch to OFF
9) Turn the ignition switch to ON
10) Move the gear selector to "2"
11) Move the gear selector to "1"
12) Move the gear selector to "2"
13) Move the gear selector to "3"
14) Move the gear selector to "D"
Here is what those codes mean:

If the light blinks 2 times a second this means there are no codes.

If the light blinks 4 times a second this means there is a power supply or grounding problem.

If the light doesn't blink or show up then there is a problem with light's circuit.

Quote:


Code Item
11 Duty solenoid A
12 Duty solenoid B
13 Shift solenoid 3
14 Shift solenoid 2
15 Shift solenoid 1
21 ATF temp sensor
22 Atmospheric sensor
23 Engine revolution signal
24 Duty solenoid C
25 Engine torque control signal
31 Throttle sensor
32 Vehicle speed sensor 1
33 Vehicle speed sensor 2
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Old 01-27-2011, 12:58 PM   #7 (permalink)
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I just tried the above procedure and got a code - 27. Any ideas where I can look that up? I tried Google and that got me a big fat nothing.
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Old 01-27-2011, 01:30 PM   #8 (permalink)
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ATF temperature sensor.. open or shorted input signal
according to my manual
My manual is for 2000

TROUBLE SYMPTOM:
Excessive shift shock
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Old 01-27-2011, 01:38 PM   #9 (permalink)
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Thanks! That also goes to my theory of having icy water splashed up under the car causing the problem. I went to the car wash yesterday and made sure I had the undercarriage washed and, so far, there isn't any more flashing light. I'll, obviously, keep an eye on it.
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Old 03-03-2011, 12:48 PM   #10 (permalink)
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As an update to this, once we had a few warmer days the problem went away and has stayed away now that it's cold again. It seems as though there must have been some moisture up in there somewhere that has finally evaporated.
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