ELECTROHYDRAULIC Control Unit: Disassembly

Fig 1: Electrical Unit Components

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1 - SOLENOID CAP

2 - SOLENOID CAP

3 - BOLT - M6X32

4 - BOLT - M6X30

5 - LEAF SPRING

6 - MODULATING PRESSURE REGULATING SOLENOID VALVE

7 - SHIFT PRESSURE REGULATING SOLENOID

8 - 3-4 SHIFT SOLENOID

9 - TORQUE CONVERTER LOCK-UP SOLENOID

10 - 1-2/4-5 SHIFT SOLENOID

11 - 2-3 SHIFT SOLENOID

12 - ELECTRICHYDRAULIC CONTROL MODULE

13 - SHIFT PLATE

1. Remove electrohydraulic unit from the vehicle. (Refer to TRANSMISSION/AUTOMATIC TRANSMISSION - NAG1/ELECTROHYDRAULIC UNIT - REMOVAL) .
2. Remove solenoid caps (1, 2). See Fig 1.
3. Unscrew Torx® socket bolts (3, 4). See Fig 1.
   NOTE: Pay attention to the different lengths of the Torx® socket bolts.
4. Remove leaf springs (5).
5. Withdraw solenoid valves (6 - 11) from shift plate (13).
   NOTE: Check O-rings on solenoid valves for damage and replace if necessary.
6. Bend away retaining lug on stiffening rib on transmission oil temperature sensor.
7. Remove electrohydraulic control module (12) from the shift plate (13).
   Fig 2: Shift Valve Group Locations

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   A - OPERATING AND LUBRICATING PRESSURE REGULATING VALVES AND 2-3 OVERLAP VALVE

   B - 1-2/4-5 SHIFT GROUP AND SHIFT, SHIFT VALVE, AND REGULATING VALVE PRESSURE REGULATING VALVES

   C - 3-4 SHIFT GROUP

   D - 2-3 SHIFT GROUP, TCC LOCK-UP AND B2 REGULATING VALVES

8. Note the locations of the major shift valve group components for assembly reference. See Fig 2.
   1. A - Operating and Lubricating Pressure Regulating valves and 2-3 Overlap valve
   2. B - 1-2/4-5 Shift Group and Shift, Shift Valve, and Regulating Valve Pressure Regulating Valves
   3. C - 3-4 Shift Group
   4. D - 2-3 Shift Group, TCC Lock-up, and B2 Regulating Valves
   Fig 3: Shift Plate Components

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   1 - BOLTS - 29

   2 - VALVE HOUSING

   3 - SEALING PLATE

   4 - VALVE BODY

   5 - LEAF SPRING

   NOTE: Pay great attention to cleanliness for all work on the shift plate. Fluffy cloths must not be used. Leather cloths are particularly good. After dismantling, all parts must be washed and blown out with compressed-air, noting that parts may be blown away.
9. Unbolt leaf spring (5). See Fig 3.
10. Unscrew Torx® bolts (1). See Fig 3.
11. Remove valve housing (2) from valve body (4). See Fig 3.
12. Remove sealing plate (3).
    Fig 4: Solenoid Valve Strainer Locations

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    1 - SOLENOID VALVE STRAINERS

13. Remove the strainers (1, 2) for the modulating pressure and shift pressure control solenoid valves from the valve housing. See Fig 4.
    Fig 5: Converter Lock-up Solenoid Valve Strainer Location

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    1 - CONVERTER LOCK-UP SOLENOID STRAINER

14. Remove the strainer (1) in the inlet to torque converter lock-up control solenoid valve. See Fig 5.
    Fig 6: Check Balls and Strainer Location

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    1 - STEEL CHECK BALLS

    2 - CENTRAL STRAINER

    3 - STEEL CHECK BALLS

    4 - PLASTIC CHECK BALLS

    5 - PLAIN DOWEL PIN

    NOTE: A total of 12 valve balls are located in the valve body, four made from plastic (4) and eight from steel (1, 3).
15. Note the location of all check balls (1, 3, 4) and the central strainer (2) for reinstallation. Remove all check balls (1, 3, 4) and the central strainer (2). See Fig 6.
    Fig 7: Valve Body Components

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    1 - VALVE BODY	8 - SHIFT VALVE PRESSURE REGULATING VALVE
    2 - 1-2/4-5 COMMAND VALVE	9 - B2 SHIFT VALVE
    3 - 1-2/4-5 HOLDING PRESSURE SHIFT VALVE	10 - 2-3 HOLDING PRESSURE SHIFT VALVE
    4 - 1-2/4-5 SHIFT PRESSURE SHIFT VALVE	11 - 2-3 COMMAND VALVE
    5 - 1-2/4-5 OVERLAP REGULATING VALVE, SLEEVE, AND PISTON	12 - 2-3 SHIFT PRESSURE SHIFT VALVE
    6 - SHIFT PRESSURE REGULATING VALVE	13 - TCC LOCK-UP REGULATING VALVE
    7 - REGULATING VALVE PRESSURE REGULATING VALVE	14 - TCC DAMPER VALVE - if equipped

16. Remove the screws holding the side covers to the valve body and valve housing.
17. Remove all valves and springs from the valve body (1). See Fig 7. Check all valves for ease of movement and shavings.
    NOTE: The sleeves and pistons of the overlap regulating valves must not be mixed up.
    Fig 8: Valve Housing Components

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    1 - 2-3 OVERLAP REGULATING VALVE, SLEEVE, AND PISTON	6 - 3-4 SHIFT PRESSURE SHIFT VALVE
    2 - VALVE HOUSING	7 - 3-4 OVERLAP REGULATING VALVE, SLEEVE, AND PISTON
    3 - SELECTOR VALVE	8 - OPERATING PRESSURE REGULATING VALVE
    4 - 3-4 HOLDING PRESSURE SHIFT VALVE	9 - LUBRICATING PRESSURE REGULATING VALVE
    5 - 3-4 COMMAND VALVE

18. Remove all valves and springs from the valve housing (2). See Fig 8. Check all valves for ease of movement and shavings.
    Fig 9: Pressure Feed Valve Location

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    1 - PRESSURE FEED VALVE

19. Remove the pressure supply valve (1) from the valve body. See Fig 9.