Welcome to the North American Subaru Impreza Owners Club Thursday November 27, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Transmission (AT/MT) & Driveline

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 08-19-2001, 08:09 PM   #1
chuckles
Scooby Specialist
 
Member#: 2955
Join Date: Nov 2000
Location: M-town, NH
Vehicle:
02 Chuck Wagon
Oh yea its white

Thumbs down HELP! AT oil temp light... flashing!!

we put an AFC in and the install is clean and correct. then the damn warning light starts blinking. help what do I do?
* Registered users of the site do not see these ads.
chuckles is offline   Reply With Quote
Old 08-19-2001, 08:32 PM   #2
chuckles
Scooby Specialist
 
Member#: 2955
Join Date: Nov 2000
Location: M-town, NH
Vehicle:
02 Chuck Wagon
Oh yea its white

Default

Also, it only comes on if I get above 4000 RPM's then it'll stay blinking after that.
chuckles is offline   Reply With Quote
Old 08-19-2001, 08:40 PM   #3
Albert
Scooby Specialist
 
Member#: 3288
Join Date: Dec 2000
Location: San Diego, CA. USA
Vehicle:
1998 Impreza 2.5RS
Rally Blue Pearl

Default

Your initial post pretty much tells me where I would look first. I've never heard of any conflicts with a S-AFC in an automatic.

Did you do any other maintenance during that period that could have tripped the light?
Albert is offline   Reply With Quote
Old 08-19-2001, 09:04 PM   #4
chuckles
Scooby Specialist
 
Member#: 2955
Join Date: Nov 2000
Location: M-town, NH
Vehicle:
02 Chuck Wagon
Oh yea its white

Default

no we did rear spats too. thats it. the afc install is good all wires connect and everything is right.
chuckles is offline   Reply With Quote
Old 08-19-2001, 11:52 PM   #5
Jon [in CT]
*** Banned ***
 
Member#: 2992
Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
Vehicle:
02 WRX Sedan
Silver

Default

A prudent person would be suspicious that a flashing AT coolant lamp just after the install of your AFC is mere coincidence and would question whether "the afc install is good all wires connect and everything is right."

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.

If you can actually retrieve a DTC from the hocus pocus above, report it here and I can tell you what it signifies.

Last edited by Jon [in CT]; 08-20-2001 at 12:02 AM.
Jon [in CT] is offline   Reply With Quote
Old 08-20-2001, 10:31 AM   #6
JGard
pooptastic
 
Member#: 1904
Join Date: Jul 2000
Chapter/Region: TXIC
Location: Austin, TX
Vehicle:
2014 Lexus IS 350
01 Miata red

Default

Jon, I am the one that installed it, so I can tell you this...

I didn't have a soldering iron, so I had to just wrap and tape them...which i wasn't too cool with, but I made the best of it.

The only problem I had was with the throttle sensor cable. When I stripped the wire, I also stripped away a strand or two of the actual wire. I kept it together as best I could, and when checking out the reading on the AFC, it seems to read without a problem.

Other than that, I touched no wires. The only thing I can think of, is that when someone else hooked up some gauges a week or so ago, they may have barely tapped another wire, and when I got in there, it just made things worse, and I had no way of knowing.
JGard is offline   Reply With Quote
Old 08-20-2001, 05:36 PM   #7
chuckles
Scooby Specialist
 
Member#: 2955
Join Date: Nov 2000
Location: M-town, NH
Vehicle:
02 Chuck Wagon
Oh yea its white

Default

Jgard, that's not it. the blinking is the faster of what Jon mentioned. not that I'm sure what that means yet.
chuckles is offline   Reply With Quote
Old 08-20-2001, 05:55 PM   #8
chuckles
Scooby Specialist
 
Member#: 2955
Join Date: Nov 2000
Location: M-town, NH
Vehicle:
02 Chuck Wagon
Oh yea its white

Default

ok, I think that I saw 3 long pulses then 5 short ones. now what the heck does that mean?
chuckles is offline   Reply With Quote
Old 08-20-2001, 07:42 PM   #9
Jon [in CT]
*** Banned ***
 
Member#: 2992
Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
Vehicle:
02 WRX Sedan
Silver

Default

Um, there isn't a DTC number 35. Here's a couple nearby ones:

33 - Front vehicle speed sensor - This usually caused by a bad circuit (open, shorted or bad connection) between either the front vehicle speed sensor and the TCM or between the speedometer and the TCM.


36 - Torque converter turbine speed sensor - The input signal circuit to the TCM from the torque converter turbine speed sensor is open or shorted or a connector in the circuit is faulty.

Based on what JGard18 posted, I'm guessing that you saw code 33. But maybe you should try it again?

EDIT: BTW, the codes above are for the 2002 Impreza. If you have a different model year, then you need help from somebody else because I don't have those manuals.

Last edited by Jon [in CT]; 08-20-2001 at 07:52 PM.
Jon [in CT] is offline   Reply With Quote
Old 08-20-2001, 09:52 PM   #10
chuckles
Scooby Specialist
 
Member#: 2955
Join Date: Nov 2000
Location: M-town, NH
Vehicle:
02 Chuck Wagon
Oh yea its white

Default

I have a MY00 and what about a 45? do you have anything for a 45? **** someone give me a clue.
chuckles is offline   Reply With Quote
Old 08-20-2001, 10:46 PM   #11
Jon [in CT]
*** Banned ***
 
Member#: 2992
Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
Vehicle:
02 WRX Sedan
Silver

Default

Well, remember, this is from a 2002 Impreza manual ... but yes, there is a code 45.

45 - Intake manifold pressure signal (Non-turbo model) - Detects open or shorted input signal circuit on a wire from the ECU to the TCM. The diagnosis consists, primarily, of testing that one wire circuit to see if it's open, shorted or has a bad connection. It starts of with:

Check engine ground terminals and ground circuit of the ECU.
Check harness connector between TCM and ECU (both ends).
Next, after the engine is warmed up and the AT fluid temp is above 176 degrees F, insure the voltage on that line is between 1.2 and 1.8 volts.
Finally, if no joy yet, check for poor contact in the intake manifold pressure signal circuit between the sensor and the ECU.

If all of this fails to uncover the problem, the solution is "Replace the TCM." Ouch!

I wish I could say which wire you should be concerned about, but I don't have any 2000 Impreza manuals.
Jon [in CT] is offline   Reply With Quote
Old 08-20-2001, 11:16 PM   #12
chuckles
Scooby Specialist
 
Member#: 2955
Join Date: Nov 2000
Location: M-town, NH
Vehicle:
02 Chuck Wagon
Oh yea its white

Default

this may be it... if I"m not mistaken doesn't the AFC read pressure? could it be that the connection is just loose?

my fingers are crossed.
chuckles is offline   Reply With Quote
Old 08-21-2001, 11:52 AM   #13
JGard
pooptastic
 
Member#: 1904
Join Date: Jul 2000
Chapter/Region: TXIC
Location: Austin, TX
Vehicle:
2014 Lexus IS 350
01 Miata red

Default

Chuck, I'm pretty sure that's what the AFC changes...it's the MAP sensor reading. I dunno...maybe that's different from the pressure...but it's definitely something we can check.

I'll be getting a soldering iron shortly...so I can reattach all the wires...
JGard is offline   Reply With Quote
Old 08-29-2001, 12:34 PM   #14
Jon [in CT]
*** Banned ***
 
Member#: 2992
Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
Vehicle:
02 WRX Sedan
Silver

Default

Hey chuckles/JGard18, was there any resolution to the flashing AT Temp light? I was just curious about whether the TCM trouble code stuff actually led to a solution. Plus, in the future, if anyone has a similar problem and finds this thread, they can see whether/how the problem was resolved.
Jon [in CT] is offline   Reply With Quote
Old 08-29-2001, 01:23 PM   #15
JGard
pooptastic
 
Member#: 1904
Join Date: Jul 2000
Chapter/Region: TXIC
Location: Austin, TX
Vehicle:
2014 Lexus IS 350
01 Miata red

Default

i haven't had a chance to look at it. from what he tells me, it's very intermittent...

which leads me to believe it's the wiring job I did (crappy, btw)

I will be up there this Sunday, and I'll be able to actually solder them this time. I have a feeling that will fix it.
JGard is offline   Reply With Quote
Old 12-23-2001, 05:24 AM   #16
Andrew
Scooby Specialist
 
Member#: 1170
Join Date: Mar 2000
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2005 STi
White

Default

im bumping this. my at oil light flashes when i go wot even with my tranny temps low. this has only happened after my split second programmable map install.

chuckles, did you resolve your problem?
Andrew is offline   Reply With Quote
Old 12-23-2001, 06:46 PM   #17
inpreza kid
Scooby Specialist
 
Member#: 3334
Join Date: Dec 2000
Location: Calgary, Alberta, Canada
Default

when i put in a afc in my auto My00RS i got a flashing AT oil temp light. it went away after i reconnected to map sensor wires. from what i know the TCU reads the map signal too. first thing i would check is the wire map wire connections.
inpreza kid is offline   Reply With Quote
Old 12-23-2001, 08:24 PM   #18
Andrew
Scooby Specialist
 
Member#: 1170
Join Date: Mar 2000
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2005 STi
White

Default

hm...but my map sensor is disconnect to the ecu. how am i supposed to reconnect it and still use my map?

could it maybe be due to RPMs or something? i used the SAFC wiring diagram to splice my ss map in so i did everything you have done...

TPS? im clueless as to why it would go off.
Andrew is offline   Reply With Quote
Old 12-23-2001, 10:30 PM   #19
inpreza kid
Scooby Specialist
 
Member#: 3334
Join Date: Dec 2000
Location: Calgary, Alberta, Canada
Default

if anyone has the TCU wiring diagram it would help alot. it can be any of the sensors the tcu is reading that is causing the light to come on.
inpreza kid is offline   Reply With Quote
Old 01-24-2002, 09:55 PM   #20
EvasionOfTruth
Scooby Specialist
 
Member#: 13282
Join Date: Dec 2001
Chapter/Region: MAIC
Location: Richmond, VA
Vehicle:
2007 FXT
WRB SPB Edition

Default

Anyone find the cause? Mine started doing this tonight on the way home from my relatives.

Buster

I counted the flashes from the light, there were a total of 16 flashes. They were very short, .5 to 1 second.

Last edited by EvasionOfTruth; 01-24-2002 at 10:15 PM.
EvasionOfTruth is offline   Reply With Quote
Old 01-25-2002, 12:30 AM   #21
Jon [in CT]
*** Banned ***
 
Member#: 2992
Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
Vehicle:
02 WRX Sedan
Silver

Default

Hello. The flashing AT Oil light is just the Transmission Control Module's way of telling you it's detected a problem. In order to persuade it to flash out the actual problem code, you have to give it the secret handshake with the shifter. Otherwise, it just keeps flashing mindlessly. I described how to give the handshake earlier in this thread. Print it out and take it to the car with you and try it.
Jon [in CT] is offline   Reply With Quote
Old 01-25-2002, 04:05 PM   #22
Joncas
Scooby Specialist
 
Member#: 5349
Join Date: Mar 2001
Location: Central New York
Default

Had the same problem when I installed mine a few weeks ago. I would bet my lunch money that its a bad connection/connections.

Here's what I would do (fixed mine).

1. Pull the connectors off of the computer in the car
2. Pull the connectors apart on the s-afc cabling
3. Use a multimeter to do a continuity test between the two ends.

If your connections are all good I'm willing to bet you have one wrong wire spliced. You shouldn't use 3 wires on the s-afc.

Good luck - let me know if you need more info. I was in the ecu again last night.
Joncas is offline   Reply With Quote
Old 01-25-2002, 07:11 PM   #23
EvasionOfTruth
Scooby Specialist
 
Member#: 13282
Join Date: Dec 2001
Chapter/Region: MAIC
Location: Richmond, VA
Vehicle:
2007 FXT
WRB SPB Edition

Default

I went to the garage a friend works at today, he pulled up some info on Mitchell Repair info for me. It seems that the 16 flashes on my 97 2.2 is the dtc code. The symptom is Torque Control signal is open or shorted from ECM. I scanned the print out so everyone can take a look at it. http://busterswebpage.iwarp.com/cgi-...es/dtc16_2.jpg

Buster

Jon [in CT] I tried the way you had mentioned, it didnt do anything. I am assuming it is just for the my02. Thanks though

inpreza kid - I have the wiring for the 97 2.2 TCU, doubt it would be the same for any newer models though

Last edited by EvasionOfTruth; 01-25-2002 at 07:16 PM.
EvasionOfTruth is offline   Reply With Quote
Old 01-25-2002, 10:09 PM   #24
G-REX
Scooby Specialist
 
Member#: 8804
Join Date: Jul 2001
Chapter/Region: South East
Vehicle:
2008 Impreza STi
Dark Gray Metallic

Default

Quote:
Originally posted by Jon [in CT]


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"

Also, after you do this, be sure and do the following:

Press A, B, A, B, Left, Right, Left, Right, Up, Up, Down and then Start the car. An extra man will show up next to the check engine light.

Sorry, honestly, thanks for the info Jon!
G-REX is offline   Reply With Quote
Old 01-25-2002, 10:37 PM   #25
^jynx^
Scooby Specialist
 
Member#: 1787
Join Date: Jul 2000
Location: Danbury, CT
Default

i had a AT light flashing at me the other day in snow, thought it could be the tranny got hot? so i turned off the engine for a minute started it back up and no more flashing
^jynx^ is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Flashing AT oil temp light thejunkman55 Normally Aspirated Powertrain 3 10-19-2009 11:34 PM
Flashing AT OIL TEMP light - need help jeep_kevin Forester Forum 4 10-05-2004 04:59 PM
Flashing AT Oil Temp light? Hit Man X Transmission (AT/MT) & Driveline 10 08-15-2003 10:01 PM
AT OIL TEMP Light flashes WorldTour Legacy Forum 5 07-31-2003 04:57 PM
AT OIL TEMP light flashes at startup... BoardRider Legacy Forum 3 04-21-2003 10:31 PM


All times are GMT -4. The time now is 09:50 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.