With the gear selector lever in the PARK (P) position and the engine running, the line pressure from the fluid pump assembly is directed to various components in the control valve body assembly and the transmission case assembly.

Manual Valve

Mechanically controlled by the gear selector lever, the manual valve is in the PARK (P) position and prevents line (2) pressure from the primary regulator valve from entering the drive (19) and reverse (22) fluid circuits.

Reverse, 1st Shift Solenoid (SS) Valve Assembly (S1)

Line (2) fluid passes through orifice #3 into the S1 signal (14) fluid circuit in preparation for a shift. The normally open reverse, 1st SS valve assembly is OFF, allowing any fluid pressure in the S1 signal (14) fluid circuit to exhaust through the solenoid.

3-4, 4-5 Shift Solenoid (SS) Valve Assembly (S4)

Line (2) fluid passes through orifice #4 into the S4 signal (17) fluid circuit in preparation for a shift. The normally open 3-4, 4-5 SS valve assembly is OFF, allowing any fluid pressure in the S4 signal (17) fluid circuit to exhaust through the solenoid.

Reverse Shift Solenoid (SS) Valve Assembly (S5)

Line (2) fluid passes through orifice #5 into the S5 signal (18) fluid circuit. The normally closed reverse SS valve assembly is OFF, causing fluid pressure to build-up in the S5 signal (18) fluid circuit.

Shift Pressure Relay Valve

S5 signal (18) fluid is routed to the shift pressure relay valve and applies the valve against spring force.

U1 Shift Valve

Line (2) fluid is also routed to the U1 shift valve and passes through the valve into the 1-2 reverse clutch (39) fluid circuit.

1-2 Reverse Clutch (B5) Assembly

1-2 reverse clutch (39) fluid enters the automatic transmission case cover assembly and moves the 1-2 reverse clutch piston against spring force to apply the 1-2 reverse clutch plates. In PARK range, the 1-2 reverse clutch has no effect. However, when REVERSE or a forward range is selected, only one apply device has to be energized, which helps create a smooth starting motion.

Lock Up Relay Valve

1-2 reverse clutch (39) fluid is also routed to the lock up relay valve. Here it assists converter feed (3) fluid pressure and spring force to hold the valve in the released position, thus preventing torque converter clutch apply.

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