Stevo F Posted June 28, 2017 Share Posted June 28, 2017 When I started up the GT tonight to change the oil (this is my son's daily driver) I noticed the dreaded 16 blinks of the AT temp light. I had recently did an ATF drain (approx 5 qts) and refill, as the old fluid was a nasty dark brown color. The transmission immediately was shifting smoother (previously had a delayed 2nd to 3rd shift since we bought the car in February). I rechecked the fluid level and it's good and the fluid is pretty much a healthy looking pinkish red color. So in summary- AT Temp light blinks 16X Recent ATF change No sign of torque bind Put in fuse to revert to FWD and light still blinks. So does this sound like a Duty C issue or maybe it needs another ATF change? Actually I would have thought hings would have been gummed up by the old ATF if anything. Link to comment Share on other sites More sharing options...
wtdash Posted June 29, 2017 Share Posted June 29, 2017 Hi, The issue can be diagnosed by following this: http://www.ultimatesubaru.org/forum/topic/113278-how-to-read-transmission-codes/#entry952067 And I'd do @ least 1 or 2 more flushes. The other 1/2 of the ATF is/was in the TC. If no TB w/or w/out the FWD fuse the Duty C sounds OK. GL, TD Link to comment Share on other sites More sharing options...
Stevo F Posted July 1, 2017 Author Share Posted July 1, 2017 The occurred to me- what if I used the wrong transmission fluid, but I used the generic stuff that is rated Dexron III (and I think it's the same stuff I've been running in wagon), so I don't think that's the issue. https://shop.advanceautoparts.com/p/carquest-oil-fluids-dexron-iii-mercon-atf-automatic-transmission-fluid-1-quart-cq420/8130008-P Since I drained approximately 50% of the fluid in the first drain and fill, and another drain and fill couldn't hurt. In the meantime, I'm going to attempt to read what the error code is later today. Link to comment Share on other sites More sharing options...
Setnev Posted July 3, 2017 Share Posted July 3, 2017 16 flashes is only to report that there is an internal fault on one of the solenoids or other external sensors on the transmission. It's not the actual code because it would never flash 16 times for code reporting. Try this method to get the AT Temp light to report back your TCU stored codes: Warm up the engine Turn the ignition switch OFF Turn the ignition switch ON Start the engine Drive the vehicle at speeds greater than 12 MPH Stop the vehicle Depress the brake pedal and move the gear selector to "1" Turn the ignition switch to OFF Turn the ignition switch to ON Move the gear selector to "2" Move the gear selector to "1" Move the gear selector to "2" Move the gear selector to "3" Move the gear selector to "D" The AT Temp light will spit out a series of flashes, a long flash is 10 and short is 1. Per the FSM, here is the codes that may be reported: Phase I codes(roughly 1998 and earlier) 11 Line pressure duty solenoid. Short or Disconnection in solenoid driving circuit 12 Lockup duty solenoid. Short or disconnection in solenoid driving circuit 13 2-4 brake timing solenoid. Short or disconnection in solenoid driving circuit 14 Shift solenoid B. Short or disconnection in solenoid driving circuit 15 Shift solenoid A. Short or disconnection in solenoid driving circuit 16 2-4 brake duty solenoid. Short or disconnection in solenoid driving circuit 21 ATF temperature sensor. Short or disconnection in input circuit 22 Pressure sensor. Short or disconnection in input circuit 23 Engine speed signal. No signal input above 10km/h 24 Transfer duty solenoid. Short or disconnection in solenoid driving circuit 25 Engine torque control signal. Short or disconnection in engine torque control signal circuit 31 Throttle sensor. Short or disconnection in input circuit 32 Vehicle speed sensor 1. No signal input to speed sensor 1 above 20km/h 33 Vehicle speed sensor 2. No signal input to speed Sensor 2 above 20km/h 34 Turbine sensor. No signal input in ranges other than N range 36 Low clutch timing solenoid. Short or disconnection in solenoid driving circuit If you let me know what codes you have, I can tell you what you need to do to test and it will help you replace the sensor or solenoid that is defective. EDIT: It looks like wtdash posted the same thing, only linked it to a different site. Link to comment Share on other sites More sharing options...
Stevo F Posted July 5, 2017 Author Share Posted July 5, 2017 16 flashes is only to report that there is an internal fault on one of the solenoids or other external sensors on the transmission. It's not the actual code because it would never flash 16 times for code reporting. Try this method to get the AT Temp light to report back your TCU stored codes: The AT Temp light will spit out a series of flashes, a long flash is 10 and short is 1. Per the FSM, here is the codes that may be reported: If you let me know what codes you have, I can tell you what you need to do to test and it will help you replace the sensor or solenoid that is defective. EDIT: It looks like wtdash posted the same thing, only linked it to a different site. I tried this 4 times to the letter, and all I ended up with is the AT Temp light staying on steady (along with the rest on the lights as you end up with the ignition switch on and the car not running). No blinking codes at all. Link to comment Share on other sites More sharing options...
ehsnils Posted July 5, 2017 Share Posted July 5, 2017 Try to clear the condition first by disconnecting the battery and press the brake pedal for 20 seconds and then see if the problem remains when you turn on the vehicle again. Link to comment Share on other sites More sharing options...
Stevo F Posted July 6, 2017 Author Share Posted July 6, 2017 Try to clear the condition first by disconnecting the battery and press the brake pedal for 20 seconds and then see if the problem remains when you turn on the vehicle again. I know this method works to clear ECU CEL's, but will it work with TCU error codes as well? Link to comment Share on other sites More sharing options...
Brighton96 Posted July 6, 2017 Share Posted July 6, 2017 I know this method works to clear ECU CEL's, but will it work with TCU error codes as well? Yeah it will, no power=no ability to save codes. Disconnecting the battery will reset everything. If the CEL issue is still an active issue, it should come back almost immediately Link to comment Share on other sites More sharing options...
Stevo F Posted July 6, 2017 Author Share Posted July 6, 2017 Yeah it will, no power=no ability to save codes. Disconnecting the battery will reset everything. If the CEL issue is still an active issue, it should come back almost immediately It's worth a try, anyway. Link to comment Share on other sites More sharing options...
Stevo F Posted August 11, 2017 Author Share Posted August 11, 2017 I was all set to have my mechanic pull the TPU code then my son told me the light isn't blinking anymore. We had my mechanic try to find any stored codes and there were none, so all seems OK for now. Probably will do a another drain and fill before my son takes the car to college. Link to comment Share on other sites More sharing options...
wtdash Posted August 17, 2017 Share Posted August 17, 2017 FYI...the recommended (on most sites I frequent) # of Drain/Refill/Drive (thru all gears) cycles is 3. This gets 90% of the old fluid out. And Yes, the Dex III-compatible is correct, per the OM. GL, TD Link to comment Share on other sites More sharing options...
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