When operating conditions are appropriate, the TCM de-energizes the 1-2, 2-3, reverse shift solenoid valve assembly (S3) to shift the transmission into Fourth gear. The manual valve remains in the DRIVE (D) position and line (2) pressure continues to feed the drive (19) fluid circuit.

1-2, 2-3, Reverse Shift Solenoid (SS) Valve Assembly (S3)

The 1-2, 2-3, reverse SS valve assembly is de-energized, allowing fluid pressure to build-up in the S3 signal (16) fluid circuit.

U2 Shift Valve

S3 signal (14) fluid is routed to the U2 shift valve and shifts the valve against spring force to the applied position. This allows servo feed (44) fluid to pass into the 4-5 clutch (40) fluid circuit.

4-5 Clutch (C3) Assembly

4-5 clutch (40) fluid is routed to the 4-5 clutch piston to apply the 4-5 clutch plates.

B4 Release Valve

4-5 clutch (40) fluid is also routed through orifice #28 to the B4 release valve and shifts the valve against spring force to the applied position.

3rd Gear Band (B4) Servo Piston Assembly

When the U2 shift valve shifts to the applied position, 3rd gear band apply (46) fluid and servo apply (45) fluid exhaust through the valve allowing the 3rd gear band servo piston assembly and the 3rd gear band assembly to release.

#9 Reverse Shift Restrict Ball Check Valve

Exhausting 3rd gear band apply (46) fluid seats the reverse shift restrict ball check valve against the servo release (43) fluid passage and enters the servo apply (45) fluid passage.

U2 Shift Valve

Servo apply (45) fluid is routed to the U2 shift valve where it exhausts

U2 Shift Valve

With the U2 shift valve in the applied position, S4 signal (17) fluid passes through the valve into the 45 enable (51) fluid circuit.

Solenoid Relay Valve

45 enable (51) fluid is routed to the solenoid relay valve and replaces exhausting 3rd gear band apply (46) fluid to hold the valve in the released position. With the solenoid relay valve in the released position, lock up control (12) fluid is allowed to enter the TCC signal (13) fluid circuit. TCC signal (13) fluid is routed through the lock up relay valve and on to the lock up control valve in preparation for a possible torque converter clutch apply.

M2 Shift Valve

Direct clutch feed 2 (28) fluid is routed to the M2 shift valve where it is blocked by the valve in preparation for an upshift to fifth gear.

1. SUCTION
2. LINE
3. CONVERTER FEED
4. RELEASE
5. APPLY
6. EXHAUST ENABLE
7. COOLER
8. LUBE
9. SOLENOID MODULATOR
10. THROTTLE SIGNAL (SLT)
11. SHIFT CONTROL (SLS)
12. LOCK UP CONTROL (SLU)
13. TCC SIGNAL
14. S1 SIGNAL
15. S2 SIGNAL
16. S3 SIGNAL
17. S4 SIGNAL
18. S5 SIGNAL
19. DRIVE
20. DRIVE OR REVERSE
21. REGULATED DRIVE OR REVERSE
22. REVERSE
23. REVERSE CLUTCH
24. LOW AND REVERSE CLUTCH
25. REVERSE CONTROL
26. FORWARD CLUTCH
27. DIRECT CLUTCH FEED 1
28. DIRECT CLUTCH FEED 2
29. DIRECT CLUTCH
30. B2 CONTROL 1
31. B2 CONTROL 2
32. SECOND CLUTCH
33. B1 CONTROL 1
34. B1 CONTROL 2
35. B1 CONTROL 3
36. SECOND COAST CLUTCH
37. B5 CONTROL 1
38. B5 CONTROL 2
39. 1-2 REVERSE (B5) CLUTCH
40. 4-5 CLUTCH
41. B4 CONTROL
42. B4 RELEASE
43. SERVO RELEASE
44. SERVO FEED
45. SERVO APPLY
46. 3RD GEAR BAND APPLY
47. PN12345
48. PRN15
49. 234NCON
50. 345 ENABLE
51. 45 ENABLE
52. REVERSE INHIBIT
53. VENT
54. EXHAUST
55. SUMP
56. VOID
57. TORQUE CONVERTER SEAL DRAINBACK