Upshift Control and TCC Apply

UPSHIFT CONTROL AND TCC APPLY
The Transaxle control module (TCM) calculates the upshift points based primarily on two inputs: Accelerator pedal position (APP) angle and vehicle speed. When the TCM determines that conditions are met for a shift to occur, the TCM commands the shift by closing or opening the voltage circuit for the appropriate solenoids.
Perform the following steps:
1. Refer to the Shift Speed chart and choose an APP angle of 12 percent, 25 percent, or 50 percent. All throttle angles shown should be tested to cover the normal driving range.
2. Monitor the following scan tool parameters:
^ APP Angle
^ Vehicle Speed
^ Engine Speed
^ Transmission ISS
^ Transmission OSS
^ Commanded Gear
^ Gear Ratio
^ Shift Solenoids 1-5
^ TCC Slip Speed
3. Place the gear selector in the Drive position.
4. Accelerate the vehicle using the chosen APP angle. Hold the throttle steady.
5. As the transmission upshifts, note the vehicle speed when the shift occurs for each gear change. There should be a noticeable shift feel or engine speed change within I second of the commanded gear change.
6. Compare the shift speed to the Shift Speed Chart. Shift speeds may vary slightly due to transmission fluid temperature.
7. Repeat steps I through 6 to complete all 3 APP angles.
8. Check for TCC apply in 3rd, 4th, and 5th gears.

PART THROTTLE DETENT DOWNSHIFT
Perform the following steps:
1. Place the gear selector in the Drive position.
2. Accelerate the vehicle to 72 km/h (45 mph) in 5th gear.
3. Quickly increase the APP angle to approximately 50 percent.
4. Verify that the TCC releases, and the transmission downshifts to 4th gear.

FULL THROTTLE DETENT DOWNSHIFT
Perform the following steps:
1. Place the gear selector in the Drive position.
2. Accelerate the vehicle to 72 km/h (45 mph) in 5th gear.
3. Quickly increase the APP angle to approximately 100 percent (WOT).
4. Verify that the TCC releases, and the transmission downshifts to 3rd gear.

MANUAL DOWNSHIFTS
Shifts between all forward gears are controlled by the shift solenoids, not the manual valve. "Manual" downshifts are accomplished by the TCM, based on the Transaxle Range Switch input.

Manual 5-3 Downshift
1. Place the gear selector in the Drive position.
2. Accelerate the vehicle to 72 km/h (45 mph) in 5th gear.
3. Release the accelerator pedal while moving gear selector to Intermediate.
4. Verify the following:
^ The TCC releases
^ The transaxle downshifts immediately to 3rd gear
^ The engine slows the vehicle

Manual 5-2 Downshift
1. Place the gear selector in the Drive position.
2. Accelerate the vehicle to 72 km/h (45 mph) in 5th gear.
3. Release accelerator pedal while moving gear selector to Low.
4. Verify the following:
^ The TCC releases
^ The transmission downshifts immediately to 2nd gear.
^ The engine slows the vehicle.