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Home >> Subaru >> 2019 >> WRX STI Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Continuously Variable Transmission (Diagnostics)) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P0747: Pressure Control Solenoid "A" Stuck On >> Diagnostic Method

Diagnostic Method

WARNING: This page is about a different variant/trim than selected.

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Diagnosis 1 
Measured line pressure
> Map 1 kPa
Diagnosis 2 
Measured line pressure
> Map 2 kPa

Map 1: Torque converter clutch circuit control solenoid output command = OFF 

  Engine speed (rpm)
0 500 1000 1500 2000 2500 3000
Transmission fluid temperature (degC) - 40 25600 25600 5752 5752 5712 5616 5531
- 20 25600 25600 5752 5752 5712 5616 5531
0 25600 25600 5510 5565 5605 5649 5701
20 25600 25600 5414 5476 5537 5579 5617
40 25600 25600 5359 5359 5445 5514 5567
60 25600 25600 5312 5312 5401 5490 5545
80 25600 25600 5312 5312 5401 5490 5545
100 25600 25600 5343 5343 5343 5427 5499
120 25600 25600 5140 5140 5140 5281 5348
140 25600 25600 5277 5277 5277 5277 5372
  Engine speed (rpm)
3500 4000 4500 5000 5500 6000 6500
Transmission fluid temperature (degC) - 40 5549 5556 5581 5612 5671 5706 5719
- 20 5549 5556 5581 5612 5671 5706 5719
0 5750 5801 5851 5911 5976 6026 6078
20 5664 5710 5769 5822 5862 5927 5983
40 5610 5659 5718 5777 5825 5873 5929
60 5578 5621 5668 5718 5763 5813 5863
80 5578 5621 5668 5718 5763 5813 5863
100 5577 5609 5650 5694 5739 5796 5810
120 5415 5450 5482 5523 5549 5585 5604
140 5480 5530 5560 5596 5628 5608 5661

Map 2: Torque converter clutch circuit control solenoid output command = ON 

  Engine speed (rpm)
0 500 1000 1500 2000 2500 3000
Transmission fluid temperature (degC) - 40 25600 25600 6213 5778 5748 5640 5608
- 20 25600 25600 6213 5778 5748 5640 5608
0 25600 25600 5512 5563 5603 5644 5677
20 25600 25600 5379 5438 5510 5562 5600
40 25600 25600 5277 5277 5381 5470 5533
60 25600 25600 5316 5316 5336 5431 5503
80 25600 25600 5403 5403 5403 5444 5519
100 25600 25600 5381 5381 5381 5381 5446
120 25600 25600 5255 5255 5255 5255 5336
140 25600 25600 5128 5128 5128 5128 5174
  Engine speed (rpm)
3500 4000 4500 5000 5500 6000 6500
Transmission fluid temperature (degC) - 40 5590 5582 5599 5635 5689 5740 5824
- 20 5590 5582 5599 5635 5689 5740 5824
0 5714 5758 5805 5881 5941 5998 6046
20 5644 5691 5739 5795 5850 5899 5958
40 5579 5629 5678 5737 5788 5844 5900
60 5552 5595 5648 5697 5747 5800 5854
80 5568 5617 5667 5709 5761 5833 5854
100 5524 5587 5615 5666 5725 5784 5798
120 5421 5473 5525 5570 5626 5636 5659
140 5269 5326 5361 5401 5434 5440 5470

Time needed for diagnosis:  5 seconds

Malfunction indicator light illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.