If vehicle speed becomes greater than 12 km/h (7 mph) while the transmission is operating in REVERSE, the TCM commands the following changes to the transmission's hydraulic and electrical systems in order to inhibit reverse operation and prevent damage to the transmission.

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

The reverse, 1st SS valve assembly is energized, causing fluid pressure to build-up in the S1 signal (14) fluid circuit.

U1 Shift Valve

S1 signal (14) fluid is routed to the U1 shift valve and passes through the valve into the reverse inhibit (52) fluid circuit.

M1 Shift Valve

Reverse inhibit (52) fluid is routed to the M1 shift valve and applies the valve against spring force.

Reverse Shift Solenoid (SS) Valve Assembly (S5)

The reverse SS valve assembly is de-energized, 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.

Low and Reverse Clutch (B3) Assembly

When the M1 shift valve is shifted to the applied position, reverse clutch (23) fluid is blocked and low and reverse clutch (24) fluid exhausts through the valve allowing the low and reverse clutch assembly to release.

Shift Pressure Relay Valve

Exhausting low and reverse clutch (24) fluid is routed into the B5 control 2 (38) fluid passage at the M1 shift valve, the B5 control 1 (37) fluid passage at the solenoid relay valve, the reverse control (25) fluid passage at the B5 control valve, and on to the shift pressure relay valve where it exhausts.

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

The 1-2, 2-3, reverse SS valve assembly is de-energized. However, because there is no fluid supplied to the circuit, the 1-2, 2-3, reverse SS valve assembly has no effect in REVERSE INHIBIT.

Direct Clutch (C2) Assembly

When the M1 shift valve is shifted to the applied position, direct clutch feed 1 (27) fluid is blocked and direct clutch (29) fluid pressure exhausts, allowing the direct clutch assembly to release.

M2 Shift Valve

Exhausting direct clutch (29) fluid passes through the M2 shift valve into the direct clutch feed 2 (28) fluid circuit and on to the M1 shift valve where it exhausts.

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