Automatic Transaxle - 4T65-E - Overhaul: Other Chevrolet Uplander I

Model Build Information (MN7)

Model Build Information (RPO MN7)

Model Build Information (M15)

Model Build Information (RPO M15)

Model Build Information (M76)

Model Build Information (RPO M76)

Scheme 128

Scheme 129

Scheme 130

Scheme 131

Scheme 132

Scheme 133

Scheme 134

Scheme 135

Scheme 136

Scheme 137

Scheme 138

Scheme 139

Scheme 140

Scheme 141

Scheme 142

Scheme 143

Scheme 144

Scheme 145

Scheme 146

Scheme 147

Scheme 148

Scheme 149

Scheme 150

Scheme 151

Scheme 152

Scheme 153

Scheme 154

Tools Required

1. J 3289-20 Holding Fixture Base
2. J 28664-B Transmission Holding Fixture. See «Special Tools»(ref-246425-S06796853872006122100000) .
3. J44465 Holding Fixture Adapter. See «Special Tools»(ref-246425-S06796853872006122100000) .

Procedure

1. Install J44465 onto J 28664-B . See «Special Tools»(ref-246425-S06796853872006122100000) .
2. Install J 28664-B onto the transmission. See «Special Tools»(ref-246425-S06796853872006122100000) .
3. Install the transmission and holding fixture into J 3289-20 .
4. Insert the pin into J 3289-20 in order to hold the transmission in the desired position.

1. J 6125-1B Slide Hammer
2. J 44467 Output Shaft Assembly Remover and Installer. See «Special Tools»(ref-246425-S06796853872006122100000) .
3. J 44755 Holding Fixture

J 42562 Axle Removal Wedge. See Special Tools .

1. J 8001 Dial Indicator Set
2. J 25025-8 Dial Indicator Mounting Post. See «Special Tools»(ref-246425-S06796853872006122100000) .
3. J 26958-10A Adapter Plug
4. J 28585 Snap Ring Remover

1. If the final drive assembly (700) has been removed it must be reinstalled.
2. Make sure that the thrust washer (714) and the bearing (715) are still on the differential carrier.
3. Install the case extension seal (8) onto the case extension (6).
4. Install the case extension assembly (6) onto the transmission case.
5. Install only two of the four case extension bolts (5). Tighten: Do not torque the bolts. Tighten them only until the case extension is fully seated.
6. Position the transmission so that the case extension is facing upward.
7. Install J 25025-8 , J 26958-10A and J 8001 .
8. Set the dial indicator to zero.
9. Use J 28585 or a large screwdriver in order to lift the differential carrier. Pry up on the vehicle speed sensor reluctor wheel through the sensor hole in the case extension.
10. Note the dial indicator reading before changing the carrier thrust washer (714). If the dial indicator reading is less than 0.12 mm (0.005 in), install the next smaller size thrust washer, then recheck. If the dial indicator reading is greater than 0.62 mm (0.025 in), install the next larger size thrust washer, then recheck. If the dial indicator reading is 0.12-0.62 mm (0.005-0.025 in), the thrust washer is correct. Refer to the Differential Carrier/Case Thrust Washer (714) Selection Guide in «End Play Specifications»(ref-246425-S03500943152006122100000) .
11. Remove J 8001 , J 25025-8 and J 26958-10A . See «Special Tools»(ref-246425-S06796853872006122100000) .

1. J 23129 Seal Remover
2. J 6125-1B Slide Hammer

Scheme 155

Use J 23129 and J 6125-1B in order to remove the axle oil seal assembly (409) from the case cover (401).

J44538 Torx® 30+. See Special Tools .

Checking Procedure

1. Make sure that the driven sprocket support (609) and both sprockets (506, 516) are fully seated.
2. Pull the drive link assembly (507) toward the case at the indicated location.
3. Measure the distance between the case and the drive link assembly (507): If the measurement is 3.2 mm (1/8 in) or greater, reuse the drive link assembly (507). If the measurement is less than 3.2 mm (1/8 in), replace the drive link assembly (507).

Tool Required

J 33381-A Clutch Assembly Remover/Installer. See Special Tools .

J 38358-A 1-2 Support Remover and Installer

J 28585 Snap Ring Remover

1. J 41103 Torque Converter Seal Remover Set
2. J 41103-1 Torque Converter Seal Puller Legs
3. J 41103-2 Torque Converter Seal Puller Bridge
4. J 41103-3 Torque Converter Seal Support Body

1. J 23907 Universal Slide Hammer and Puller
2. J 26941 Drive Sprocket Support Bearing Remover

1. J 8092 Driver Handle
2. J 28677 Drive Sprocket Support Bearing Installer. See «Special Tools»(ref-246425-S06796853872006122100000) .
3. J 36850 Transmission Assembly Lubricant

J 28540-A Converter Seal Installer

Scheme 156

Note. Install the seal onto the tool before installing into the case to prevent damage to the seal.

Use J 28540-A and a mallet in order to install the torque converter oil seal (525).

J 28585 Snap Ring Remover

J 36850 Assembly Lubricant (or equivalent)

J 22888-D Universal Bearing Puller. See Special Tools .

J 36850 Assembly Lubricant (or equivalent)

1. Position the 1-2 support drum assembly (687) on the bench as shown.
2. Install the reaction sun gear assembly (678) into the 1-2 support drum (687).
3. Rotate the components as indicated by the arrows: The roller clutch should move freely in the indicated directions The roller clutch should lock in the direction opposite of that indicated
4. If the roller clutch does not function as described, reassemble the clutch correctly or replace the assembly.

J 38358-A 1-2 Support Remover/Installer

Scheme 157

Use J 38358-A in order to assemble the 1-2 support drum assembly (681-687) into the case.

1. Use feeler gages in order to check for excessive pinon gear end play in the input carrier assembly (672) and in the reaction carrier assembly (675).
2. End play should measure 0.23-0.77 mm (0.009-0.030 in).

J 36850 Assembly Lubricant (or equivalent)

1. Hold the input sun gear (668) stationary in the position shown.
2. The third clutch pawl outer race (727) should rotate only in the direction shown by the arrow and not in the opposite direction.
3. The input clutch pawl assembly (728) should rotate only in the direction shown by the arrow and not in the opposite direction.

1. J 23327 Clutch Spring Compressor
2. J 25018-A Clutch Spring Compressor Adapter
3. J 8059 Snap Ring Pliers. See «Special Tools»(ref-246425-S06796853872006122100000) .

1. J 8059 Snap Ring Pliers. See «Special Tools»(ref-246425-S06796853872006122100000) .
2. J 23327 Clutch Spring Compressor
3. J 25018-A Clutch Spring Compressor Adapter
4. J 37361 Input Clutch Inner Piston Seal Protector. See «Special Tools»(ref-246425-S06796853872006122100000) .
5. J 37362 Third Clutch Inner Piston Seal Protector. See «Special Tools»(ref-246425-S06796853872006122100000) .

1. Use a rubber tipped air nozzle in order to apply a maximum 138 kPa (20 psi) at each indicated fluid passage.
2. Listen for the following: The third clutch (1) assembly to apply The input clutch (2) assembly to apply

J 34741-A Input Seal Installer contains:. See Special Tools .

1. J 34741-1 Adjustable Seal Protector. See «Special Tools»(ref-246425-S06796853872006122100000) .
2. J 34741-2 Seal Pusher. See «Special Tools»(ref-246425-S06796853872006122100000) .
3. J 34741-3 Seal Sizer. See «Special Tools»(ref-246425-S06796853872006122100000) .

1. J 26958 Output Shaft Loading and Aligning Tool. See «Special Tools»(ref-246425-S06796853872006122100000) .
2. J 26958-10B Adapter Plug. See «Special Tools»(ref-246425-S06796853872006122100000) .
3. J 33381-A Final Drive Remover and Installer. See «Special Tools»(ref-246425-S06796853872006122100000) .
4. J 33386-A Input Shaft End Play Tool. See «Special Tools»(ref-246425-S06796853872006122100000) .
5. J 38385 Output Shaft Loading Tool Adapter. See «Special Tools»(ref-246425-S06796853872006122100000) .
6. J 43425 Output Shaft Loading Tool Adapter. See «Special Tools»(ref-246425-S06796853872006122100000) .

1. Adjust the collar on tool J 33381-A to the 4T65-E CLUTCH & DRUM setting. See «Special Tools»(ref-246425-S06796853872006122100000) .
2. Install J 33381-A into the input clutch housing assembly (632). See «Special Tools»(ref-246425-S06796853872006122100000) .
3. Tighten the threaded rod of J 33381-A until the rod is finger tight. See «Special Tools»(ref-246425-S06796853872006122100000) .
4. Use J 33381-A in order to lift the input clutch housing assembly (632). See «Special Tools»(ref-246425-S06796853872006122100000) . The sprag clutch assemblies will also be attached.
5. Install the assembly (632) into the case. Be sure that the assembly is down all the way.
6. Remove J 33381-A from the assembly. See «Special Tools»(ref-246425-S06796853872006122100000) .
7. Install J 38385 (3) for a standard duty transmission or J 43425 (3) for a heavy duty transmission. See «Special Tools»(ref-246425-S06796853872006122100000) .
8. Install J 26958-10B (2) depending on model. See «Special Tools»(ref-246425-S06796853872006122100000) . Standard duty uses this tool with the smaller end (4) facing down. Heavy duty uses this tool with the larger end (5) facing down.
9. Install J 26958 (1) onto the case extension (6). See «Special Tools»(ref-246425-S06796853872006122100000) .
10. Using two bolts, install J 33386-A onto the case. See «Special Tools»(ref-246425-S06796853872006122100000) .
11. Tighten the bolts in order to securely hold J 33386-A . See «Special Tools»(ref-246425-S06796853872006122100000) .
12. Tighten J 26958 finger tight in order to eliminate differential carrier end play. See «Special Tools»(ref-246425-S06796853872006122100000) .
13. Insert the thrust washer (630) from the input clutch housing into J 33386-A as indicated. See «Special Tools»(ref-246425-S06796853872006122100000) . If the thrush washer will not fit into J 33386-A , select the next size smaller thrust washer and recheck. See «Special Tools»(ref-246425-S06796853872006122100000) .
14. Use a feeler gauge in order to measure the clearance between J 33386-A and the thrust washer (630). See «Special Tools»(ref-246425-S06796853872006122100000) . If the clearance is less than 0.0521 mm (0.006 in), use the current size thrust washer. If the clearance is 0.0521 mm (0.006 in) or more, select the next size larger thrust washer and recheck. Refer to the Bearing/Input Clutch Hub Selective Thrust Washer (630) Selection Guide in «End Play Specifications»(ref-246425-S03500943152006122100000) .
15. Remove J 33386-A . See «Special Tools»(ref-246425-S06796853872006122100000) .
16. Adjust the collar on tool J 33381-A to the 4T65-E CLUTCH & DRUM setting. See «Special Tools»(ref-246425-S06796853872006122100000) . Make sure that the threaded rod is fully loosened.
17. Install J 33381-A into the input clutch housing (632). See «Special Tools»(ref-246425-S06796853872006122100000) .
18. Tighten the threaded rod of J 33381-A until the rod is finger tight. See «Special Tools»(ref-246425-S06796853872006122100000) .
19. Use J 33381-A in order to lift the input clutch housing assembly (632). See «Special Tools»(ref-246425-S06796853872006122100000) . The sprag clutch assemblies will also be attached.
20. Remove the assembly (632) from the case.
21. Position the transmission so that the oil pan is facing down.
22. Remove J 26958 (1), J 26958-10B (2) and J 38385 (3) or J 43425 (3). See «Special Tools»(ref-246425-S06796853872006122100000) .

1. J 33381-A Final Drive Remover and Installer. See «Special Tools»(ref-246425-S06796853872006122100000) .
2. J 33386-A Input Shaft End Play Tool. See «Special Tools»(ref-246425-S06796853872006122100000) .
3. J 36850 Assembly Lubricant
4. J 44472 End Play Checking Tool. See «Special Tools»(ref-246425-S06796853872006122100000) .

1. Install the final drive sun gear shaft (689).
2. Use J 36850 or equivalent in order to retain the parking gear thrust bearing (695) to the parking gear (696).
3. Install the parking gear thrust bearing (695) and the parking gear (696).
4. Install the final drive sun gear (697).
5. Install J 44472 . See «Special Tools»(ref-246425-S06796853872006122100000) .
6. Adjust the collar on tool J 33381-A to the 4T65-E CLUTCH & DRUM setting. See «Special Tools»(ref-246425-S06796853872006122100000) .
7. Install J 33381-A into the input clutch housing assembly (632). See «Special Tools»(ref-246425-S06796853872006122100000) .
8. Tighten the threaded rod of J 33381-A until the rod is finger tight. See «Special Tools»(ref-246425-S06796853872006122100000) .
9. Use J 33381-A in order to lift the input clutch housing assembly (632). See «Special Tools»(ref-246425-S06796853872006122100000) . The sprag clutch assemblies will also be attached.
10. Install the assembly (632) into the case. Be sure that the assembly is down all the way.
11. Remove J 33381-A from the assembly. See «Special Tools»(ref-246425-S06796853872006122100000) .
12. Using two bolts, install J 33386-A onto the case. See «Special Tools»(ref-246425-S06796853872006122100000) .
13. Tighten the bolts in order to securely hold J 33386-A . See «Special Tools»(ref-246425-S06796853872006122100000) .
14. Tighten J 44472 finger tight in order to eliminate differential carrier end play. See «Special Tools»(ref-246425-S06796853872006122100000) .
15. Insert the thrust washer (630) from the input clutch housing into J 33386-A as indicated. See «Special Tools»(ref-246425-S06796853872006122100000) . If the thrush washer will not fit into J 33386-A , select the next size smaller thrust washer and recheck. See «Special Tools»(ref-246425-S06796853872006122100000) .
16. Use a feeler gauge in order to measure the clearance between J 33386-A and the thrust washer (630). See «Special Tools»(ref-246425-S06796853872006122100000) . If the clearance is less than 0.0521 mm (0.006 in), use the current size thrust washer. If the clearance is 0.0521 mm (0.006 in) or more, select the next size larger thrust washer and recheck. Refer to the Bearing/Input Clutch Hub Selective Thrust Washer (630) Selection Guide in «End Play Specifications»(ref-246425-S03500943152006122100000) .
17. Remove J 33386-A . See «Special Tools»(ref-246425-S06796853872006122100000) .
18. Adjust the collar on tool J 33381-A to the 4T65-E CLUTCH & DRUM setting. See «Special Tools»(ref-246425-S06796853872006122100000) . Make sure that the threaded rod is fully loosened.
19. Install J 33381-A into the input clutch housing (632). See «Special Tools»(ref-246425-S06796853872006122100000) .
20. Tighten the threaded rod of J 33381-A until the rod is finger tight. See «Special Tools»(ref-246425-S06796853872006122100000) .
21. Use J 33381-A in order to lift the input clutch housing assembly (632). See «Special Tools»(ref-246425-S06796853872006122100000) . The sprag clutch assemblies will also be attached.
22. Remove the assembly (632) from the case.
23. Position the transmission so that the oil pan is facing down.
24. Remove J 44472 . See «Special Tools»(ref-246425-S06796853872006122100000) .
25. Remove the final drive sun gear (697).
26. Remove the parking gear (696) and the parking gear thrust bearing (695).
27. Remove the final drive sun gear shaft (689).

1. J 23327 Clutch Spring Compressor
2. J 38734 Spring Compressor Adapter

1. J 23327 Clutch Spring Compressor
2. J 38734 Spring Compressor Adapter
3. J 41992-1 Protector. See «Special Tools»(ref-246425-S06796853872006122100000) .
4. J 41992-2 Adapter. See «Special Tools»(ref-246425-S06796853872006122100000) .
5. J 41992-3 Installer. See «Special Tools»(ref-246425-S06796853872006122100000) .

J 4670-01 Clutch Spring Compressor. See Special Tools .

1. J 34129 Bearing Remover. See «Special Tools»(ref-246425-S06796853872006122100000) .
2. J 8092 Driver Handle

Scheme 158

Use J 34129 , J 8092 and a hammer in order to remove the driven sprocket support bearing assembly from the driven sprocket support assembly (609).

1. J 34126 Bearing Installer. See «Special Tools»(ref-246425-S06796853872006122100000) .
2. J 8092 Driver Handle

Scheme 159

Use J 34126 , J 8092 and a hammer in order to seat the driven sprocket support bearing assembly flush with or below the driven sprocket support assembly (609) hub.

J 4670-01 Clutch Spring Compressor. See Special Tools .

1. For the purposes of this test, attach the driven sprocket support assembly (609) and the second clutch housing thrust washer (611) onto the second clutch housing assembly (617).
2. Apply 138 kPa (20 psi) to the feed holes marked 2 and 4 and listen for the second and fourth clutches to apply.
3. Hold the pressure for five seconds. If the clutches do not apply and hold, then disassemble the driven sprocket support components. Inspect all of the seals and clutches for proper assembly. When finished, repeat the functional check.
4. When the clutches apply and hold correctly, remove the driven sprocket support assembly (609) and the second clutch housing thrust washer (611) from the second clutch housing assembly (617).

J 33381-A Clutch Assembly Remover/Installer. See Special Tools .

J 36850 Assembly Lubricant (or equivalent)

1. J 29569-1 Turbine Shaft Seal Installer (Chain Side) Expander
2. J 29569-2 Turbine Shaft Seal Installer (Chain Side) Compressor
3. J 29829-1A Turbine Shaft Seal Installer (Converter Side) Expander. See «Special Tools»(ref-246425-S06796853872006122100000) .
4. J 29829-2 Turbine Shaft Seal Installer (Converter Side) Compressor. See «Special Tools»(ref-246425-S06796853872006122100000) .
5. J 36850 Assembly Lubricant (or equivalent)

J 36850 Assembly Lubricant (or equivalent)

1. J 8092 Driver Handle
2. J 41991 Driveshaft Bearing Remover/Installer. See «Special Tools»(ref-246425-S06796853872006122100000) .

1. J 8092 Driver Handle
2. J 41991 Driveshaft Bearing Remover/Installer. See «Special Tools»(ref-246425-S06796853872006122100000) .

J 34115 Left Side Axle Seal Installer. See Special Tools .

Scheme 160

Note. Install the seal onto the tool before installing into the case to prevent damage to the seal.

Use J 34115 in order to install the left side axle oil seal assembly (409). See Special Tools .

1. J 36850 Assembly Lubricant (or equivalent)
2. J44538 TORX® 30+. See «Special Tools»(ref-246425-S06796853872006122100000) .

1. J 8001 Dial Indicator Set
2. J 25025-8 Dial Indicator Mounting Post. See «Special Tools»(ref-246425-S06796853872006122100000) .
3. J 26958-10A Adapter Plug
4. J 28585 Snap Ring Remover

1. Make sure that the differential carrier/case thrust washer (714) and the thrust bearing (715) are still on the differential/final drive carrier assembly (700).
2. Install the case extension seal (8) onto the case extension (6).
3. Install the case extension assembly (6) onto the transmission (3).
4. Install only two of the four case extension bolts (5). Tighten: Do not torque the bolts. Tighten them only until the case extension is fully seated.
5. Position the transmission so that the case extension is facing upward.
6. Install J 25025-8 , J 26958-10A and J 8001 . See «Special Tools»(ref-246425-S06796853872006122100000) .
7. Set the dial indicator to zero.
8. Use J 28585 or a large screwdriver in order to lift the differential/final drive carrier assembly. Pry up on the vehicle speed sensor reluctor wheel through the vehicle speed sensor hole in the case extension.
9. Note the dial indicator reading before changing the differential carrier/case thrust washer (714): If the dial indicator reading is less than 0.12 mm (0.005 in), install the next smaller size thrust washer, then recheck. If the dial indicator reading is greater than 0.62 mm (0.025 in), install the next larger size thrust washer, then recheck. If the dial indicator reading is 0.12-0.62 mm (0.005-0.025 in), the thrust washer is correct.
10. Remove J 8001 and J 25025-8 . See «Special Tools»(ref-246425-S06796853872006122100000) .
11. Install the case extension bolts (5). Tighten: Tighten the case extension bolts to 36 N.m (26 lb ft).

1. J 23129 Seal Remover
2. J 6125-1B Slide Hammer

Scheme 161

Use J 23129 and J 6125-1B in order to remove the axle oil seal assembly (4) from the case extension assembly (6).

1. J 29130 Axle Seal Installer. See «Special Tools»(ref-246425-S06796853872006122100000) .
2. J 8092 Driver Handle

Scheme 162

Note. Install the seal onto the tool before installing into the case to prevent damage to the seal.

Use J 29130 and J 8092 in order to install the axle oil seal assembly (4) on the case extension assembly.

Cleaning Procedure

1. Clean the control valve body thoroughly in clean solvent.
2. Move the valves with a pick or a small screwdriver in order to dislodge any dirt or debris.
3. Use an air nozzle in order to dry the control valve body and to blow out all of the passages.
4. Gently probe the small passages with a piece of identification tag wire or the equivalent.

J 36850 Assembly Lubricant (or equivalent)

J 36850 Assembly Lubricant (or equivalent)

J 34094-A Thermal Element Height Gauge. See Special Tools .

1. J 36850 Assembly Lubricant (or equivalent)
2. J 44472 End Play Checking Tool. See «Special Tools»(ref-246425-S06796853872006122100000) .

1. Position the transaxle so that the case side cover is facing down.
2. Install the final drive sun gear shaft (689).
3. Use J 36850 or equivalent in order to retain the parking gear thrust bearing (695) to the parking gear (696). Install the parking gear thrust bearing (695) and the parking gear (696).
4. Install the final drive sun gear (697).
5. Install the gauge bar (1) onto the case mounting surface.
6. Install J 44472 (2) onto the transmission. See «Special Tools»(ref-246425-S06796853872006122100000) . Tighten: Tighten J 44472 to remove end play. See «Special Tools»(ref-246425-S06796853872006122100000) . Hand tighten only.
7. Measure the distance from the case mounting surface, bottom of the gauge bar (1) to the top of the final drive sun gear (697). This measurement is dimension A, refer to «Transfer Case Selective Washer Specifications»(ref-246425-S03909116842006122100000) .
8. Remove the gauge bar (1) and J 44472 (2). See «Special Tools»(ref-246425-S06796853872006122100000) .
9. Install the gauge bar onto the carrier.
10. Measure the distance from the bottom of the gauge bar to the transfer case. This measurement is Dimension B1.
11. Measure the distance from the bottom of the gauge bar to the thrust bearing (1). This measurement is Dimension B2.
12. Subtract Dimension B2 from Dimension B1. This Dimension is B. Refer to «Transfer Case Selective Washer Specifications»(ref-246425-S03909116842006122100000) .
13. Remove the gauge bar from the transfer case.
14. Remove the final drive sun gear (697).
15. Refer to «Transfer Case Selective Washer Specifications»(ref-246425-S03909116842006122100000) . Install the selective washer (902).
16. Install the final drive sun gear (697).

J 36850 Assembly Lubricant (or equivalent)

1. J 28664-B Transmission Holding Fixture. See «Special Tools»(ref-246425-S06796853872006122100000) .
2. J 3289-20 Holding Fixture Base
3. J44465 Holding Fixture Adapter. See «Special Tools»(ref-246425-S06796853872006122100000) .

1. J 8001 Dial Indicator Set
2. J 26900-13 Magnetic Indicator Base
3. J 35138 Torque Converter End Play Checking Tool

J 36850 Assembly Lubricant (or equivalent)

Park or Neutral - Engine Running (Park - Without Touch Activated Power)

When the gear selector lever is in the PARK (P) position and the engine is running, fluid is drawn into the oil pump and line pressure is then directed to the following control devices

Pressure Regulator Valve (313)

Regulates pump output (line pressure) in response to torque signal fluid pressure acting on the boost valve, spring force and line pressure acting on the end of the valve. Line pressure is directed to the manual valve, 3 accumulator valves, torque signal regulator valve, pressure relief valve, TCC regulator valve, #10 ball check valve and 2-3 shift valve, 3-2 manual downshift valve, 3-4 shift valve, 2-3 shift solenoid valve, #3 ball check valve and input clutch and actuator feed limit valve.

Actuator Feed Limit Valve (414)

Line pressure is routed to the valve and limited to a maximum pressure as it passes through the valve and enters the actuator feed circuit. Actuator feed is then routed to the pressure control solenoid valve and into the 1-2, 3-4 shift solenoid valve.

Pressure Control (PC) Solenoid Valve (322)

Controlled by the PCM, the PC solenoid valve regulates filtered actuator feed pressure entering the torque signal circuit. Torque signal fluid is then routed to the pressure regulator valve, the 1-2, 2-3 and 3-4 accumulator valves.

Line Pressure Relief Valve (324)

Exhausts line pressure above 1,690-2,480 kPa (450-360 psi).

Manual Valve (404)

The manual valve is moved to the NEUTRAL position and blocks line pressure from entering the Reverse fluid circuit. The reverse fluid circuit is opened to an exhaust at the manual valve.

1-2, 3-4 Shift Solenoid Valve (315A)

Controlled by the powertrain control module (PCM), the 1-2, 3-4 shift solenoid (SS) valve is energized (On) in PARK range. Actuator feed pressure moves the 1-2 shift valve (318) against spring pressure and directs line fluid into the 1-2, 3-4 signal passage. 1-2, 3-4 signal fluid is then directed to the 3-4 shift valve (362).

2-3 Shift Solenoid Valve (315B)

Controlled by the powertrain control module (PCM), the 2-3 shift solenoid (SS) valve is energized (On) in PARK range and directs line pressure into the 2-3 signal passage. 2-3 signal fluid directed to the 4-3 manual downshift valve (360) and moves the valve against spring pressure and also the 3-2 manual downshift valve (356).

1-2 Shift Valve (318)

1-2 signal fluid pressure holds the valve in the downshift position against spring force.

2-3 Shift Valve (357)

In PARK range, line pressure passes through the 2-3 shift valve (357) and line pressure feeds the input clutch feed passage. Line pressure then passes through the 3-4 shift valve (362) and around the #3 ball check valve (372), located in the case cover) in order to apply the input clutch. Although the input clutch is applied and the input sprag is holding, these conditions are not effective because neither the forward band assembly (688) nor the reverse band assembly (615) is applied.

1-2, 2-3 and 3-4 Accumulator Valves (350, 344, 341)

Line pressure is regulated into accumulator fluid pressure. This regulation is basically controlled by torque signal fluid pressure acting on the end of the valve.

TCC Control Valve (335)

Spring pressure holds the valve in the released position. Converter feed fluid is directed to the release circuit. Release fluid seats #1 ball check valve and feeds the TCC blow-off. Release fluid feeds the TCC on the cover side of the pressure plate, exits the TCC through the apply circuit, then feeds the cooler circuit at the TCC control valve. Cooler fluid passes through the ball check valve, through the cooler, then returns to the transmission and feeds the rear lube circuit. A front lube circuit is fed from orificed line pressure.

Scheme 163

Park or Neutral - Engine Running (Park - With Touch Activated Power)

When the gear selector lever is in the PARK (P) position and the engine is running, fluid is drawn into the oil pump and line pressure is then directed to the following control devices

Regulates pump output (line pressure) in response to torque signal fluid pressure acting on the boost valve, spring force and line pressure acting on the end of the valve. Line pressure is directed to the manual valve, 3 accumulator valves, torque signal regulator valve, pressure relief valve, TCC regulator valve, #10 ball check valve and 2-3 shift valve, 3-2 manual downshift valve, 3-4 shift valve, 2-3 shift solenoid valve, #3 ball check valve and input clutch and actuator feed limit valve.

Line pressure is routed to the valve and limited to a maximum pressure as it passes through the valve and enters the actuator feed circuit. Actuator feed is then routed to the pressure control solenoid valve and into the 1-2, 3-4 shift solenoid valve.

Controlled by the PCM, the PC solenoid valve regulates filtered actuator feed pressure entering the torque signal circuit. Torque signal fluid is then routed to the pressure regulator valve, the 1-2, 2-3 and 3-4 accumulator valves.

Exhausts line pressure above 1,690-2,480 kPa (450-360 psi).

The manual valve is moved to the NEUTRAL position and blocks line pressure from entering the Reverse fluid circuit. The reverse fluid circuit is opened to an exhaust at the manual valve.

Controlled by the powertrain control module (PCM), the 1-2, 3-4 shift solenoid (SS) valve is energized (On) in PARK range. Actuator feed pressure moves the 1-2 shift valve (318) against spring pressure and directs line fluid into the 1-2, 3-4 signal passage. 1-2, 3-4 signal fluid is then directed to the 3-4 shift valve (362).

Controlled by the powertrain control module (PCM), the 2-3 shift solenoid (SS) valve is energized (On) in PARK range and directs line pressure into the 2-3 signal passage. 2-3 signal fluid directed to the 4-3 manual downshift valve (360) and moves the valve against spring pressure and also the 3-2 manual downshift valve (356).

1-2 signal fluid pressure holds the valve in the downshift position against spring force.

In PARK range, line pressure passes through the 2-3 shift valve (357) and line pressure feeds the input clutch feed passage. Line pressure then passes through the 3-4 shift valve (362) and around the #3 ball check valve (372), located in the case cover) in order to apply the input clutch. Although the input clutch is applied and the input sprag is holding, these conditions are not effective because neither the forward band assembly (688) nor the reverse band assembly (615) is applied.

Line pressure is regulated into accumulator fluid pressure. This regulation is basically controlled by torque signal fluid pressure acting on the end of the valve.

Spring pressure holds the valve in the released position. Converter feed fluid is directed to the release circuit. Release fluid seats #1 ball check valve and feeds the TCC blow-off. Release fluid feeds the TCC on the cover side of the pressure plate, exits the TCC through the apply circuit, then feeds the cooler circuit at the TCC control valve. Cooler fluid passes through the ball check valve, through the cooler, then returns to the transmission and feeds the rear lube circuit. A front lube circuit is fed from orificed line pressure.

Scheme 164

Park or Neutral - Engine Running (Neutral-Without Touch Activated Power)

When the gear selector lever is moved from the REVERSE position to the NEUTRAL position the following changes occur to the hydraulic and electrical systems.

The manual valve is moved to the NEUTRAL position and blocks line pressure from entering the Reverse fluid circuit. The reverse fluid circuit is opened to an exhaust at the manual valve.

Spring pressure holds the valve in the released position. Converter feed fluid is directed to the release circuit. Release fluid seats #1 ball check valve and feeds the TCC blow-off. Release fluid feeds the TCC on the cover side of the pressure plate, exits the TCC through the apply circuit, then feeds the cooler circuit at the TCC control valve. Cooler fluid passes through the ball check valve, through the cooler, then returns to the transmission and feeds the rear lube circuit. A front lube circuit is fed from orificed line pressure.

Scheme 165

Park or Neutral - Engine Running (Neutral - With Touch Activated Power)

When the gear selector lever is moved from the REVERSE position to the NEUTRAL position the following changes occur to the hydraulic and electrical systems.

The manual valve is moved to the NEUTRAL position and blocks line pressure from entering the Reverse fluid circuit. The reverse fluid circuit is opened to an exhaust at the manual valve.

Spring pressure holds the valve in the released position. Converter feed fluid is directed to the release circuit. Release fluid seats #1 ball check valve and feeds the TCC blow-off. Release fluid feeds the TCC on the cover side of the pressure plate, exits the TCC through the apply circuit, then feeds the cooler circuit at the TCC control valve. Cooler fluid passes through the ball check valve, through the cooler, then returns to the transmission and feeds the rear lube circuit. A front lube circuit is fed from orificed line pressure.

Scheme 166

Reverse (Without Touch Activated Power)

When the gear selector lever is moved to the REVERSE (R) position (from the PARK position) the following changes occur in the transmission's hydraulic and electrical systems.

Increases (or decreases) in line pressure is primarily influenced by changes in the throttle position as a result of the changing operating conditions of the vehicle.

Is moved manually to the right through the gear selector lever and allows line pressure to enter the reverse fluid passage through the PRN fluid passage.

Number 5 Ball Check Valve (373)

Located in the control valve body, (300), it blocks the reverse servo feed passage forcing reverse fluid through an orifice in the spacer plate (370) into the reverse servo passage. When the manual valve (404) is moved out of reverse, the ball check valve unseats allowing reverse servo fluid to exhaust through the ball seat instead of through the orifice.

Input Clutch

Remains applied from PARK to REVERSE and becomes effective as the reverse band applies. The input sprag holds at this time.

Spring pressure holds the valve in the released position. Converter feed fluid is directed to the release circuit. Release fluid seats #1 ball check valve and feeds the TCC blow-off. Release fluid feeds the TCC on the cover side of the pressure plate, exits the TCC through the apply circuit, then feeds the cooler circuit at the TCC control valve. Cooler fluid passes through the ball check valve, through the cooler, then returns to the transmission and feeds the rear lube circuit. A front lube circuit is fed from orificed line pressure.

Scheme 167

Reverse (With Touch Activated Power)

When the gear selector lever is moved to the REVERSE (R) position (from the PARK position) the following changes occur in the transmission's hydraulic and electrical systems.

Increases (or decreases) in line pressure is primarily influenced by changes in the throttle position as a result of the changing operating conditions of the vehicle.

Is moved manually to the right through the gear selector lever and allows line pressure to enter the reverse fluid passage through the PRN fluid passage.

Located in the control valve body, (300), it blocks the reverse servo feed passage forcing reverse fluid through an orifice in the spacer plate (370) into the reverse servo passage. When the manual valve (404) is moved out of reverse, the ball check valve unseats allowing reverse servo fluid to exhaust through the ball seat instead of through the orifice.

Remains applied from PARK to REVERSE and becomes effective as the reverse band applies. The input sprag holds at this time.

Spring pressure holds the valve in the released position. Converter feed fluid is directed to the release circuit. Release fluid seats #1 ball check valve and feeds the TCC blow-off. Release fluid feeds the TCC on the cover side of the pressure plate, exits the TCC through the apply circuit, then feeds the cooler circuit at the TCC control valve. Cooler fluid passes through the ball check valve, through the cooler, then returns to the transmission and feeds the rear lube circuit. A front lube circuit is fed from orificed line pressure.

Scheme 168

Overdrive Range, First Gear (Without Touch Activated Power)

When the gear selector lever is moved to the Overdrive (D) position from the NEUTRAL (N) position the following changes occur to shift the transmission into Overdrive Range - First Gear.

Is moved by the gear selector lever and allows line pressure to enter the D4 passage.

Number 6 Ball Check Valve (372)

Located in the control valve body (300), blocks forward servo apply passage forcing D4 pressure to the forward servo boost valve (367), the forward servo feed orifice on the spacer plate (370). When the manual valve (404) is moved from DRIVE to PARK or NEUTRAL, the ball check valve unseats to allow for a quick exhaust of servo apply fluid and release of the forward band assembly (688).

1-2 Shift Solenoid (SS) Valve (315A)

Energized (ON) by the PCM, high pressure in the 1-2, 3-4 signal fluid circuit holds the 12 shift valve in the downshift position. 1-2, 3-4 signal fluid also is routed to the 3-4 shift valve, but is not effective.

2-3 Shift Solenoid (SS) Valve (315B)

Energized (ON) by the PCM, high pressure in the 2-3 signal fluid circuit holds the 2-3 and 3-4 shift valves in the downshift position.

Remains applied from NEUTRAL to DRIVE and becomes effective as the forward band applies. The input sprag holds at this time.

1-2 Support Roller Clutch

The 1-2 support roller clutch holds when the forward band is applied.

Scheme 169

Overdrive Range, First Gear (With Touch Activated Power)

When the gear selector lever is moved to the Overdrive (D) position from the NEUTRAL (N) position the following changes occur to shift the transmission into Overdrive Range - First Gear.

Is moved by the gear selector lever and allows line pressure to enter the D4 passage.

Located in the control valve body (300), blocks forward servo apply passage forcing D4 pressure to the forward servo boost valve (367), the forward servo feed orifice on the spacer plate (370). When the manual valve (404) is moved from DRIVE to PARK or NEUTRAL, the ball check valve unseats to allow for a quick exhaust of servo apply fluid and release of the forward band assembly (688).

Energized (ON) by the PCM, high pressure in the 1-2, 3-4 signal fluid circuit holds the 12 shift valve in the downshift position. 1-2, 3-4 signal fluid also is routed to the 3-4 shift valve, but is not effective.

Energized (ON) by the PCM, high pressure in the 2-3 signal fluid circuit holds the 2-3 and 3-4 shift valves in the downshift position.

Remains applied from NEUTRAL to DRIVE and becomes effective as the forward band applies. The input sprag holds at this time.

The 1-2 support roller clutch holds when the forward band is applied.

Scheme 170

Overdrive Range, Second Gear (Without Touch Activated Power)

As the speed of the vehicle increases, the powertrain control module (PCM) receives input signals from various engine and transmission sensors. The PCM uses this data to de-energize 1-2, 3-4 shift solenoid valve in order to shift the transmission into second gear at the appropriate time.

1-2, 3-4 Shift Solenoid (SS) Valve (315A)

De-energized (OFF) by the PCM, it exhausts 1-2, 3-4 signal fluid through the solenoid thereby creating a low 1-2, 3-4 signal fluid pressure in the circuit. Low 1-2, 3-4 signal fluid pressure allows the 1-2 shift valve to move to the upshift position.

With the 1-2, 3-4 SS valve OFF, spring pressure moves the valve allowing D4 pressure to enter the 2nd fluid passage directing 2nd fluid to the Number 2 ball check valve.

Number 2 Ball Check Valve (372)

Located in the case cover (400), 2nd fluid seats the ball check valve and is forced through an orifice into the 2nd clutch passage to apply the 2nd clutch.

Second Clutch

2nd clutch fluid pressure applies the Second clutch to shift the transmission into Overdrive Range - Second gear.

Remains applied, but is now ineffective.

Input Sprag Clutch

Overruns as the second clutch applies.

Forward Band

Remains applied.

Continues to hold while the forward band is applied.

1-2 Accumulator

2nd clutch fluid is also routed to the 1-2 accumulator piston. 2nd Clutch fluid pressure, in addition to 1-2 assist spring force, moves the piston against spring force and 1-2 accumulator feed fluid pressure. This action absorbs initial 2nd clutch fluid pressure to cushion the second clutch apply. The movement of the 1-2 accumulator piston forces some accumulator fluid out of the accumulator.

1-2 Accumulator Valve

1-2 accumulator feed fluid forced from the 1-2 accumulator is routed back to the 1-2 accumulator valve. This pressure forces the 1-2 accumulator valve against spring force and the torque signal fluid pressure to regulate the exhaust of excess accumulator fluid. This regulation provides additional control for the second clutch apply.

TCC Control Pulse Width Modulated (PWM) Solenoid Valve

2nd fluid is routed to the TCC control PWM solenoid. Under normal operating conditions the TCC control PWM solenoid is OFF in Second gear and blocks 2nd fluid from entering the TCC signal fluid circuit.

Overdrive Range, Second Gear (With Touch Activated Power)

As the speed of the vehicle increases, the powertrain control module (PCM) receives input signals from various engine and transmission sensors. The PCM uses this data to de-energize 1-2, 3-4 shift solenoid valve in order to shift the transmission into second gear at the appropriate time.

De-energized (OFF) by the PCM, it exhausts 1-2, 3-4 signal fluid through the solenoid thereby creating a low 1-2, 3-4 signal fluid pressure in the circuit. Low 1-2, 3-4 signal fluid pressure allows the 1-2 shift valve to move to the upshift position.

With the 1-2, 3-4 SS valve OFF, spring pressure moves the valve allowing D4 pressure to enter the 2nd fluid passage directing 2nd fluid to the Number 2 ball check valve.

Located in the case cover (400), 2nd fluid seats the ball check valve and is forced through an orifice into the 2nd clutch passage to apply the 2nd clutch.

2nd clutch fluid pressure applies the Second clutch to shift the transmission into Overdrive Range - Second gear.

Remains applied, but is now ineffective.

Overruns as the second clutch applies.

Remains applied.

Continues to hold while the forward band is applied.

2nd clutch fluid is also routed to the 1-2 accumulator piston. 2nd Clutch fluid pressure, in addition to 1-2 assist spring force, moves the piston against spring force and 1-2 accumulator feed fluid pressure. This action absorbs initial 2nd clutch fluid pressure to cushion the second clutch apply. The movement of the 1-2 accumulator piston forces some accumulator fluid out of the accumulator.

1-2 accumulator feed fluid forced from the 1-2 accumulator is routed back to the 1-2 accumulator valve. This pressure forces the 1-2 accumulator valve against spring force and the torque signal fluid pressure to regulate the exhaust of excess accumulator fluid. This regulation provides additional control for the second clutch apply.

2nd fluid is routed to the TCC control PWM solenoid. Under normal operating conditions the TCC control PWM solenoid is OFF in Second gear and blocks 2nd fluid from entering the TCC signal fluid circuit.

2-3 Shift Solenoid (SS) Valve (315)

De-energizes, allowing 2-3 signal fluid to exhaust through the solenoid. Spring pressure forces the 4-3 manual downshift valve (360) to move while line pressure moves the 2-3 shift valve (357) and 3-2 manual downshift valve (356).

Number 9 Ball Check Valve (372)

Located in the control valve body (300), forces 3rd fluid through a feed orifice and into the 3rd clutch passage.

Number 4 Ball Check Valve (372)

Located in the case cover (400), directs 3rd clutch fluid into the 3rd clutch/lo-1st passage to apply the 3rd clutch.

When shifted, allows D4 fluid to enter the 3rd passage to stroke the 2-3 accumulator piston (136) and apply the 3rd clutch. The 2-3 shift valve also allows input clutch apply fluid to exhaust into the D3 passage and out at the manual valve (404). And provides 2-3 off signal fluid to the 1-2 shift valve.

Third Clutch

3rd clutch/lo-1st fluid pressure applies the third clutch to shift the transmission into Third gear.

Third Roller Clutch

Holds as third clutch applies.

In third gear, the input clutch is released allowing input clutch apply fluid to exhaust through the 3-4 shift valve (362) into the input clutch feed passage. At the 2-3 shift valve (357), exhausting input clutch apply fluid is directed into the D3 passage and out the manual valve (404).

Remains applied, but is ineffective.

Overruns as third clutch is applied.

2-3 Accumulator

Third clutch feed fluid is also routed to the 2-3 accumulator piston. This fluid pressure moves the piston against spring force and 2-3 accumulator feed fluid pressure. This action absorbs initial third clutch fluid pressure to cushion the third clutch apply. The movement of the 2-3 accumulator piston forces some accumulator fluid out of the accumulator.

2-3 Accumulator Valve

Excess 2-3 accumulator feed fluid is routed back to the 2-3 accumulator valve. This fluid pressure moves the accumulator valve against spring force and torque signal fluid pressure to regulate the exhaust of excess accumulator fluid. This regulation provides additional control for the third clutch apply.

De-energizes, allowing 2-3 signal fluid to exhaust through the solenoid. Spring pressure forces the 4-3 manual downshift valve (360) to move while line pressure moves the 2-3 shift valve (357) and 3-2 manual downshift valve (356).

Located in the control valve body (300), forces 3rd fluid through a feed orifice and into the 3rd clutch passage.

Located in the case cover (400), directs 3rd clutch fluid into the 3rd clutch/lo-1st passage to apply the 3rd clutch.

When shifted, allows D4 fluid to enter the 3rd passage to stroke the 2-3 accumulator piston (136) and apply the 3rd clutch. The 2-3 shift valve also allows input clutch apply fluid to exhaust into the D3 passage and out at the manual valve (404). And provides 2-3 off signal fluid to the 1-2 shift valve.

3rd clutch/lo-1st fluid pressure applies the third clutch to shift the transmission into Third gear.

Holds as third clutch applies.

In third gear, the input clutch is released allowing input clutch apply fluid to exhaust through the 3-4 shift valve (362) into the input clutch feed passage. At the 2-3 shift valve (357), exhausting input clutch apply fluid is directed into the D3 passage and out the manual valve (404).

Remains applied, but is ineffective.

Overruns as third clutch is applied.

Third clutch feed fluid is also routed to the 2-3 accumulator piston. This fluid pressure moves the piston against spring force and 2-3 accumulator feed fluid pressure. This action absorbs initial third clutch fluid pressure to cushion the third clutch apply. The movement of the 2-3 accumulator piston forces some accumulator fluid out of the accumulator.

Excess 2-3 accumulator feed fluid is routed back to the 2-3 accumulator valve. This fluid pressure moves the accumulator valve against spring force and torque signal fluid pressure to regulate the exhaust of excess accumulator fluid. This regulation provides additional control for the third clutch apply.

1-2, 3-4 Shift Solenoid (SS) Valve (315)

Energizes to prevent fluid from exhausting out of the line passage and the 1-2, 3-4 signal fluid passage.

Is held against 1-2, 3-4 signal fluid pressure by spring pressure and 2-3 off signal fluid pressure at the end of the valve.

3-4 Shift Valve (362)

When 1-2, 3-4 signal fluid shifts the 3-4 shift valve against spring force, it allows 3rd fluid to enter the 4th clutch fluid passage. 4th clutch fluid is forced through a feed orifice before stroking the 3-4 accumulator piston (428) and applying the fourth clutch.

Fourth Clutch

4th Clutch fluid pressure applies the fourth clutch to shift the transmission to fourth gear.

Remains applied, but is ineffective.

Overruns as fourth clutch is applied. In third gear, the input clutch is released allowing input clutch apply fluid to exhaust through the 3-4 shift valve (362) into the input clutch feed passage. At the 2-3 shift valve (357), exhausting input clutch apply fluid is directed into the D3 passage and out the manual valve (404).

Remains applied.

Remains applied, but is ineffective.

Continues to overrun.

3-4 Accumulator

4th clutch fluid is also routed to the 3-4 accumulator piston. 4th clutch fluid pressure moves the piston against spring force and 3-4 accumulator feed fluid pressure. This action absorbs initial 4th clutch fluid pressure to cushion the 4th clutch apply. The movement of the 3-4 accumulator piston forces some accumulator fluid out of the accumulator.

3-4 Accumulator Valve

Excess 3-4 accumulator feed fluid is routed back to the 3-4 accumulator valve. This fluid pressure moves the accumulator valve against spring force and torque signal fluid pressure to regulate the exhaust of excess accumulator fluid. This regulation provides additional control for the fourth clutch apply.

Energizes to prevent fluid from exhausting out of the line passage and the 1-2, 3-4 signal fluid passage.

Is held against 1-2, 3-4 signal fluid pressure by spring pressure and 2-3 off signal fluid pressure at the end of the valve.

When 1-2, 3-4 signal fluid shifts the 3-4 shift valve against spring force, it allows 3rd fluid to enter the 4th clutch fluid passage. 4th clutch fluid is forced through a feed orifice before stroking the 3-4 accumulator piston (428) and applying the fourth clutch.

4th Clutch fluid pressure applies the fourth clutch to shift the transmission to fourth gear.

Remains applied, but is ineffective.

Overruns as fourth clutch is applied. In third gear, the input clutch is released allowing input clutch apply fluid to exhaust through the 3-4 shift valve (362) into the input clutch feed passage. At the 2-3 shift valve (357), exhausting input clutch apply fluid is directed into the D3 passage and out the manual valve (404).

Remains applied.

Remains applied, but is ineffective.

Continues to overrun.

4th clutch fluid is also routed to the 3-4 accumulator piston. 4th clutch fluid pressure moves the piston against spring force and 3-4 accumulator feed fluid pressure. This action absorbs initial 4th clutch fluid pressure to cushion the 4th clutch apply. The movement of the 3-4 accumulator piston forces some accumulator fluid out of the accumulator.

Excess 3-4 accumulator feed fluid is routed back to the 3-4 accumulator valve. This fluid pressure moves the accumulator valve against spring force and torque signal fluid pressure to regulate the exhaust of excess accumulator fluid. This regulation provides additional control for the fourth clutch apply.

TCC Control (PWM) Solenoid

When conditions are appropriate, the PCM energizes the TCC control (PWM) solenoid to initiate the TCC apply. The solenoid is pulse width modulated (PWM) to provide a smooth TCC apply (refer to the appropriate electrical controls information for a detailed description of the TCC control (PWM) solenoid operation). When energized, the TCC control (PWM) solenoid modulates 2nd fluid into the TCC signal (PWM) fluid circuit.

TCC Regulator Valve

TCC signal (PWM) fluid pressure modulates the valve against spring force and TCC regulated apply fluid pressure. This action directs line pressure into the TCC regulated apply fluid circuit in relation to vehicle operating conditions.

TCC Control Valve

Modulated TCC signal (PWM) fluid pressure moves the valve against spring force in relation to vehicle operating conditions. This action regulates TCC regulated apply fluid into the TCC apply fluid circuit. At the same time, the TCC release fluid circuit is opened to an orificed exhaust. In this position the valve directs converter feed fluid to feed the cooler fluid circuit.

Cooler Check Valve

Located in either the case cover or cooler line fitting depending on model. Allows cooler fluid to pass through the cooler and provide lubrication for the transmission. It also prevents converter drainback when the engine is off.

Number 1 Ball Check Valve (372)

Located in the case cover (400), blocks TCC release fluid while sending TCC apply fluid to the torque converter clutch blow-off valve (417-20).

Converter Clutch Blow-off Valve

Limits maximum TCC apply pressure to prevent torque converter damage.

Scheme 171

When conditions are appropriate, the PCM energizes the TCC control (PWM) solenoid to initiate the TCC apply. The solenoid is pulse width modulated (PWM) to provide a smooth TCC apply (refer to the appropriate electrical controls information for a detailed description of the TCC control (PWM) solenoid operation). When energized, the TCC control (PWM) solenoid modulates 2nd fluid into the TCC signal (PWM) fluid circuit.

TCC signal (PWM) fluid pressure modulates the valve against spring force and TCC regulated apply fluid pressure. This action directs line pressure into the TCC regulated apply fluid circuit in relation to vehicle operating conditions.

Modulated TCC signal (PWM) fluid pressure moves the valve against spring force in relation to vehicle operating conditions. This action regulates TCC regulated apply fluid into the TCC apply fluid circuit. At the same time, the TCC release fluid circuit is opened to an orificed exhaust. In this position the valve directs converter feed fluid to feed the cooler fluid circuit.

Located in either the case cover or cooler line fitting depending on model. Allows cooler fluid to pass through the cooler and provide lubrication for the transmission. It also prevents converter drainback when the engine is off.

Located in the case cover (400), blocks TCC release fluid while sending TCC apply fluid to the torque converter clutch blow-off valve (417-20).

Limits maximum TCC apply pressure to prevent torque converter damage.

Scheme 172

Pressure Control (PC) Solenoid

During the downshift, except for a coastdown, the PCM senses the increase in throttle position or engine load and increases the PC solenoid duty cycle. The increase in duty cycle increases output fluid pressure from the PC solenoid, thereby increasing torque signal fluid pressure at the torque signal regulator valve.

Pressure Regulator Valve

Increased torque signal fluid pressure acting on the line boost valve increases line pressure at the pressure regulator valve.

TCC Control (PWM) Solenoid Valve

As the throttle position changes, the throttle position sensor provides input to the PCM indicating throttle angle. The PCM then lowers the ON/OFF cycle time of the TCC control PWM solenoid valve, lowering TCC signal (PWM) fluid pressure.

Lowered TCC signal (PWM) fluid pressure allows the valve to move with spring pressure, allowing converter feed fluid into the TCC release circuit. TCC release fluid is then routed to the torque converter pressure plate and disengages the torque converter clutch, TCC apply fluid from the torque converter clutch pressure plate is then routed back through its circuit to the converter clutch control valve. TCC apply fluid passes through the valve and enters the cooler circuit.

De-energizes, allowing 1-2, 3-4 signal fluid at the 3-4 shift valve (362) to exhaust through the solenoid.

When 1-2, 3-4 signal fluid exhausts, spring force moves the valve allowing 4th clutch fluid to exhaust through the valve.

Fourth Clutch fluid is exhausted at the 3-4 shift valve and the driven support ball check valve. Fourth clutch return spring pressure moves the fourth clutch piston and releases the fourth clutch.

4th Clutch fluid exhausts from the accumulator. Spring force and 3-4 accumulator feed fluid pressure move the accumulator piston to the Third gear position.

The accumulator valve regulates line pressure into the 3-4 accumulator fluid circuit to fill the 3-4 accumulator. This regulation is basically controlled by torque signal fluid pressure. Increased torque signal fluid pressure regulates accumulator fluid to a higher pressure. Note: The clutch and band application information is the same as Overdrive Range - Third Gear.

Scheme 173

During the downshift, except for a coastdown, the PCM senses the increase in throttle position or engine load and increases the PC solenoid duty cycle. The increase in duty cycle increases output fluid pressure from the PC solenoid, thereby increasing torque signal fluid pressure at the torque signal regulator valve.

Increased torque signal fluid pressure acting on the line boost valve increases line pressure at the pressure regulator valve.

As the throttle position changes, the throttle position sensor provides input to the PCM indicating throttle angle. The PCM then lowers the ON/OFF cycle time of the TCC control PWM solenoid valve, lowering TCC signal (PWM) fluid pressure.

Lowered TCC signal (PWM) fluid pressure allows the valve to move with spring pressure, allowing converter feed fluid into the TCC release circuit. TCC release fluid is then routed to the torque converter pressure plate and disengages the torque converter clutch, TCC apply fluid from the torque converter clutch pressure plate is then routed back through its circuit to the converter clutch control valve. TCC apply fluid passes through the valve and enters the cooler circuit.

De-energizes, allowing 1-2, 3-4 signal fluid at the 3-4 shift valve (362) to exhaust through the solenoid.

When 1-2, 3-4 signal fluid exhausts, spring force moves the valve allowing 4th clutch fluid to exhaust through the valve.

Fourth Clutch fluid is exhausted at the 3-4 shift valve and the driven support ball check valve. Fourth clutch return spring pressure moves the fourth clutch piston and releases the fourth clutch.

4th Clutch fluid exhausts from the accumulator. Spring force and 3-4 accumulator feed fluid pressure move the accumulator piston to the Third gear position.

The accumulator valve regulates line pressure into the 3-4 accumulator fluid circuit to fill the 3-4 accumulator. This regulation is basically controlled by torque signal fluid pressure. Increased torque signal fluid pressure regulates accumulator fluid to a higher pressure. Note: The clutch and band application information is the same as Overdrive Range - Third Gear.

Scheme 174

Drive Range, Manual Third (from Overdrive Range) (Without Touch Activated Power)

A manual 4-3 downshift is accomplished by moving the gear selector lever to the Manual Third (3) position. In Manual Third the transmission is hydraulically prevented from upshifting into Fourth gear under any conditions. Also, the input clutch is applied in Manual Third range to provide engine compression braking in 3rd gear. The following information explains the additional changes during a manual 4-3 downshift as compared to a forced 4-3 downshift. Refer to Overdrive Range: 4-3 Downshift for a complete description of a 4-3 downshift.

Manual Valve

The manual valve moves into the Manual Third (3) position and line pressure enters the D3 fluid circuit.

Allows D3 fluid to enter the input clutch feed passage and directs it to the 3-4 shift valve (362).

Is downshift when D3 fluid is fed to the valve. In this position input clutch feed fluid enters the input clutch passage. 4th clutch fluid is exhausted through an orifice.

Number 3 Ball Check Valve (372)

Located in the case cover (400), it is seated against the PRN passage allowing input clutch fluid to apply the input clutch.

When de-energized, it allows 1-2, 3-4 signal fluid from the 3-4 shift valve (362) to exhaust through the solenoid. However, this event does not have to occur in order to achieve a manual 4-3 downshift.

Manual Third-Second and First Gears

The transmission operates the same in Manual Third as in Overdrive range with the exception of Fourth gear being prevented. The transmission will upshift and downshift between First, Second and Third gears as in Overdrive range. However, engine compression braking is not available in Manual Third - First gear and the vehicle will coast when the throttle is released.

Scheme 175

Manual Third Gear (With Touch Activated Power)

A manual 4-3 downshift is accomplished by moving the gear selector lever to the Manual position. In Manual the transmission is hydraulically prevented from upshifting into Fourth gear under any conditions. Also, the input clutch is applied in Manual range to provide engine compression braking in 3rd gear. The following information explains the additional changes during a manual 4-3 downshift as compared to a forced 4-3 downshift. Refer to Overdrive Range: 4-3 Downshift for a complete description of a 4-3 downshift.

The manual valve moves into the Manual position and line pressure enters the braking fluid circuit.

Allows braking fluid to enter the input clutch feed passage and directs it to the 3-4 shift valve (362).

Is downshift when D3 fluid is fed to the valve. In this position input clutch feed fluid enters the input clutch passage. 4th clutch fluid is exhausted through an orifice.

Located in the case cover (400), it is seated against the PRN passage allowing input clutch fluid to apply the input clutch.

When de-energized, it allows 1-2, 3-4 signal fluid from the 3-4 shift valve (362) to exhaust through the solenoid. However, this event does not have to occur in order to achieve a manual 4-3 downshift.

The transmission operates the same in Manual Third as in Overdrive range with the exception of Fourth gear being prevented. The transmission will upshift and downshift between First, Second and Third gears as in Overdrive range. However, engine compression braking is not available in Manual Third - First gear and the vehicle will coast when the throttle is released.

Scheme 176

Drive Range, Manual Second (from Drive, Manual Third) (Without Touch Activated Power)

When the gear selector lever is moved to the Manual Second (D2) gear range, the manual valve moves and allows line pressure to enter the D2 fluid passage. The transmission reacts by shifting immediately into second gear range and is prevented from upshifting into either Third or Fourth gear.

Is moved by the gear selector lever allowing line pressure to enter the D2 passage.

Number 8 Ball Check Valve (372)

Located in the control valve body (300), is fed D2 fluid from the manual valve (404) and directs it to the 2-3 shift valve (357).

When shifted by D2 fluid, it allows D2 to enter the manual 2-1 servo feed passage to stroke the manual 2-1 servo assembly (104-115) and allows 3rd fluid to exhaust.

Located in the case cover (400), it directs 3rd clutch/lo-1st exhaust fluid into the 3rd clutch passage, releasing the 3rd clutch.

When energized, it allows line pressure to enter the 2-3 signal fluid passage and sends it to the 4-3 manual downshift valve (360) and 3-2 manual downshift valve (356). However, this event does not have to occur in order to achieve a manual 3-2 downshift.

3-2 Manual Downshift Valve (356)

Is shifted by 2-3 signal fluid and prevents the 2-3 shift valve (357) from upshifting.

The PCM increases the PC solenoid duty cycle to increase the operating range of torque signal fluid pressure in Manual Second. This provides increased line pressure for the additional torque requirements during engine compression braking and increased engine load in Manual Second.

Manual Second Gear (With Touch Activated Power)

When the gear selector lever is moved to the Manual gear range, the manual valve moves and allows line pressure to enter the Braking fluid passage. The transmission reacts by shifting immediately into second gear range and is prevented from upshifting into either Third or Fourth gear.

Is moved by the gear selector lever allowing line pressure to enter the braking passage.

Located in the control valve body (300), is fed braking fluid from the manual valve (404) and directs it to the 2-3 shift valve (357).

When shifted by braking fluid, it allows 3rd fluid to exhaust.

Is shifted by 2-3 signal fluid and prevents the 2-3 shift valve (357) from upshifting. It also allows braking fluid to enter the manual 2-1 servo feed passage to stroke the manual 2-1 servo assembly (104-115).

Located in the case cover (400), it directs 3rd clutch/lo-reg exhaust fluid into the 3rd clutch passage, releasing the 3rd clutch.

When energized, it allows line pressure to enter the 2-3 signal fluid passage and sends it to the 4-3 manual downshift valve (360) and 3-2 manual downshift valve (356).

The PCM increases the PC solenoid duty cycle to increase the operating range of torque signal fluid pressure in Manual Second. This provides increased line pressure for the additional torque requirements during engine compression braking and increased engine load in Manual Second.

Drive Range, Manual First (from Drive, Manual Second) (Without Touch Activated Power)

A manual 2-1 downshift is initiated by moving the gear selector lever to the Manual First (1) position. However, the transmission will not downshift into First gear until vehicle speed is below approximately 60 km/h (37 mph). At higher vehicle speeds the PCM will keep 1-2 shift solenoid (SS) valve de-energized (OFF) and the transmission will operate in Manual First - Second Gear. In Manual First the transmission is electronically prevented from upshifting into Third or Fourth gears under any conditions. Also, the third clutch is applied in Manual First - First Gear to provide engine compression braking.

Line pressure is routed into the Lo fluid circuit when the selector lever is moved into the Manual First (1) position. Line pressure continues to feed the D4, D3 and D2 fluid circuits as in Manual Second.

Number 7 Ball Check Valve (372)

Located in the control valve body (300), directs Lo fluid to the 1-2 shift valve (318).

When shifted against spring force, allows Lo fluid to enter the Lo-1st passage to the pressure regulator valve (313). During release of the 2nd clutch, exhausting 2nd fluid passes through the valve and enters the 3rd fluid passage.

Lo Blow Off Valve (407)

A relief valve that exhausts excess Lo fluid pressures above 448 kPa (65 psi) from the 3rd clutch apply circuit.

Located in the case cover (400), it seats against 3rd clutch fluid allowing Lo-1st fluid to enter the 3rd clutch fluid passage and apply the 3rd clutch.

Energizes, allowing line pressure to feed into the 1-2, 3-4 signal fluid passage and to the 3-4 shift valve (362).

Located in the case cover (400), forces exhausting 2nd clutch apply fluid through an orifice into the 2nd clutch passage and to the 1-2 shift valve (318).

Lo fluid is directed through the 1-2 shift valve (318) into the Lo-1st fluid passage. Lo-1st fluid is sent to the pressure regulator valve (313) to boost line pressure and at the same time to the Lo blow off valve (407). The addition of Lo-1st fluid pressure increases the operating range of line pressure in Manual First.

Scheme 177

Manual First Gear (With Touch Activated Power)

A manual 2-1 downshift is initiated by moving the gear selector lever to the Manual position. However, the transmission will not downshift into First gear until vehicle speed is below approximately 60 km/h (37 mph). At higher vehicle speeds the PCM will keep 1-2 shift solenoid (SS) valve de-energized (OFF) and the transmission will operate in Manual - Second Gear. Also, the third clutch is applied in Manual First - First Gear to provide engine compression braking.

Line pressure is routed into the braking circuit when the selector lever is moved into the Manual position. Line pressure continues to feed the D4 in Manual.

Located in the control valve body (300), directs braking to the 1-2 shift valve (318).

When shifted against spring force, allows braking to enter the braking-1st gear passage to the low regulator valve (313). During release of the 2nd clutch, exhausting 2nd fluid passes through the valve and enters the 3rd fluid passage.

Lo Blow Valve (443)

When shifted against spring force, allows braking first gear fluid to be directed into low reg fluid passage.

Located in the case cover (400), it seats against 3rd clutch fluid allowing low reg fluid to enter the 3rd clutch/lo-1st fluid passage and apply the 3rd clutch.

Energizes, allowing line pressure to feed into the 1-2, 3-4 signal fluid passage and to the 3-4 shift valve (362).

Located in the case cover (400), forces exhausting 2nd clutch apply fluid through an orifice into the 2nd clutch passage and to the 1-2 shift valve (318).

Scheme 178

Scheme 179

Scheme 180

Scheme 181

Scheme 182

Scheme 183

Scheme 184

Scheme 185

Scheme 186

Scheme 187

Scheme 188

Scheme 189

Scheme 190

Scheme 191

Scheme 192

Scheme 193

Scheme 194

Scheme 195

Scheme 196

Scheme 197

Scheme 198

Scheme 199