As vehicle speed increases and operating conditions become appropriate, the TCM de-energizes the reverse, 1st shift solenoid valve assembly (S1) and energizes the 2-3, 3-4 shift solenoid valve assembly (S2) to shift the transmission into Second gear. The manual valve remains in the DRIVE (D) position and line (2) pressure continues to feed the drive (19) fluid circuit.

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

The reverse, 1st SS valve assembly is de-energized, allowing fluid pressure in the S1 signal (14) fluid circuit and the reverse inhibit (52) fluid circuit to exhaust through the solenoid.

M1 Shift Valve

When reverse inhibit (52) fluid exhausts, spring force shifts the M1 shift valve to the released position. This allows B2 control 2 (31) fluid to pass through the valve into the second clutch (32) fluid circuit.

#2 Accumulator Check Valve Assembly

Second clutch (32) fluid pressure is routed to the #2 accumulator check valve assembly and moves the check valve against spring force in order to help cushion the apply of the second clutch.

Second Clutch (B2) Assembly

Second clutch (32) fluid is routed to the second clutch piston to apply the second clutch plates.

M1 Shift Valve

B1 control 2 (34) fluid is routed through the M1 shift valve into the B1 control 3 (35) fluid circuit.

2-3, 3-4 Shift Solenoid (SS) Valve Assembly (S2)

The 2-3, 3-4 SS valve assembly is energized, causing fluid pressure to build-up in the S2 signal (15) fluid circuit.

M2 Shift Valve

S2 signal (15) fluid is routed to the M2 shift valve and applies the valve against spring force, allowing B1 control 3 (35) fluid to pass through the valve into the second coast clutch (36) fluid circuit.

Second Coast Clutch (B1) Assembly

Second coast clutch (36) fluid is routed to the second coast clutch piston to apply the second coast clutch plates.

Shift Pressure Relay Valve

Drive or reverse (20) fluid passes through the shift pressure relay valve into the PN12345 (47) fluid circuit.

U1 Shift Valve

PN12345 (47) fluid is routed to the U1 shift valve where it is blocked by the valve in preparation for an upshift to third gear.

Important: Power flow for Intermediate and Low Range - Second Gear is exactly the same as Drive Range - Second 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