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Old 01-05-2021, 05:08 PM   #1
604bugeye
Scooby Newbie
 
Member#: 521477
Join Date: Jan 2021
Vehicle:
2002 WRX
WRB

Default 4eat TCM DTC code 23

Just went stage 2 with cobbs OTS tune on my 02 WRX. Did a ATF change along with the filter. Now tranny is acting up, only when I full throttle and it downshifts seems to kind of stutter and at oil temp will pop up. Maybe I possibly didnt fill ATF to correct level? Did the secret handshake and I seem to get code 23
( two long flashes, 3 quick flashes )
Now if Im correct 4eat on 02 wrx is phase II version I? Cant seem to find what the code 23 means for that specific 4eat, anything will be helpful thanks.
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Old 01-05-2021, 05:25 PM   #2
Blktrax
Scooby Specialist
 
Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: NC
Vehicle:
2004 Impreza

Default

Trans gets filled idling in park

Lowest 2 dots are add and full at cold ambient temp, upper 2 dots are add and full at operating temp.

Sounds like you're under or overfilled significantly.

Service Manual:
The level of ATF varies with fluid temperature. Pay attention to the ATF temperature when checking ATF level.
1. Raise the ATF temperature by driving a distance of 5 to 10 km (3 to 6 miles). Otherwise, idle the engine to raise ATF temperature to 70; 80C (158; 176F) on Subaru Select Monitor.
2. Park the vehicle on a level surface.
3. After selecting all positions (P, R, N, D), set the select lever in P range. Measure the ATF level with engine idling for one or two minutes.
4. Make sure that ATF level is between the upper level and lower level at HOT side.
5. If the ATF level is below the lower level, replenish recommended ATF to bring the fluid level between the upper level and lower level.
CAUTION:
-Use care not to exceed the upper limit level.
-Be sure that the replenishment of ATF to the upper level with the transmission cold will cause overfilling of ATF and result in a transmission failure.
6. Raise the ATF temperature by driving a distance of 5 to 10 km (3 to 6 miles). Otherwise, idle the engine to raise ATF temperature to 70; 80C (158; 176F) on Subaru Select Monitor.
7. Check the ATF for leaks. Make visual inspection for leaks from the inside of transmission. If there are leaks, repair or replace the gasket, oil seals, plugs or other parts.

Last edited by Blktrax; 01-05-2021 at 05:35 PM.
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Old 01-05-2021, 06:43 PM   #3
604bugeye
Scooby Newbie
 
Member#: 521477
Join Date: Jan 2021
Vehicle:
2002 WRX
WRB

Default

Quote:
Originally Posted by Blktrax View Post
Trans gets filled idling in park

Lowest 2 dots are add and full at cold ambient temp, upper 2 dots are add and full at operating temp.

Sounds like you're under or overfilled significantly.

Service Manual:
The level of ATF varies with fluid temperature. Pay attention to the ATF temperature when checking ATF level.
1. Raise the ATF temperature by driving a distance of 5 to 10 km (3 to 6 miles). Otherwise, idle the engine to raise ATF temperature to 70; 80C (158; 176F) on Subaru Select Monitor.
2. Park the vehicle on a level surface.
3. After selecting all positions (P, R, N, D), set the select lever in P range. Measure the ATF level with engine idling for one or two minutes.
4. Make sure that ATF level is between the upper level and lower level at HOT side.
5. If the ATF level is below the lower level, replenish recommended ATF to bring the fluid level between the upper level and lower level.
CAUTION:
-Use care not to exceed the upper limit level.
-Be sure that the replenishment of ATF to the upper level with the transmission cold will cause overfilling of ATF and result in a transmission failure.
6. Raise the ATF temperature by driving a distance of 5 to 10 km (3 to 6 miles). Otherwise, idle the engine to raise ATF temperature to 70; 80C (158; 176F) on Subaru Select Monitor.
7. Check the ATF for leaks. Make visual inspection for leaks from the inside of transmission. If there are leaks, repair or replace the gasket, oil seals, plugs or other parts.
Ill double check my level, still curious on the code 23 as to what it means.

Last edited by 604bugeye; 01-05-2021 at 07:36 PM.
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Old 01-06-2021, 12:14 AM   #4
Blktrax
Scooby Specialist
 
Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: NC
Vehicle:
2004 Impreza

Default

DTC 23 Mass air flow signal
Detects open or shorted input
signal circuit.
<Ref. to AT-46, DTC 23 MASS AIR FROW SIGNAL,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
DTC 23 MASS AIR FROW SIGNAL
DIAGNOSIS:
Input signal circuit of TCM from ECM is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock.
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Old 01-06-2021, 12:46 AM   #5
604bugeye
Scooby Newbie
 
Member#: 521477
Join Date: Jan 2021
Vehicle:
2002 WRX
WRB

Default

Quote:
Originally Posted by Blktrax View Post
DTC 23 Mass air flow signal
Detects open or shorted input
signal circuit.
<Ref. to AT-46, DTC 23 MASS AIR FROW SIGNAL,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
DTC 23 MASS AIR FROW SIGNAL
DIAGNOSIS:
Input signal circuit of TCM from ECM is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock.


Thanks again,
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Old 01-06-2021, 01:05 AM   #6
604bugeye
Scooby Newbie
 
Member#: 521477
Join Date: Jan 2021
Vehicle:
2002 WRX
WRB

Default

Quote:
Originally Posted by Blktrax View Post
DTC 23 Mass air flow signal
Detects open or shorted input
signal circuit.
<Ref. to AT-46, DTC 23 MASS AIR FROW SIGNAL,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
DTC 23 MASS AIR FROW SIGNAL
DIAGNOSIS:
Input signal circuit of TCM from ECM is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock.


You recommend I replace my MAF? Or take a look at the TCU
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