CHEVROLET AVEO 2002 Service Repair Manual

D - 2nd Gear
1. The input shaft rotates clockwise.
The forward clutch (C1) operates. Connect the input shaft to the front sun gear.
2. The front sun gear rotates clockwise.
3. The planetary short pinion rotates itself counterclockwise.
4. The planetary long pinion rotates itself clockwise.
5. The rear planetary sun gear is going to rotate counterclockwise.
The 2nd brake (B2) and 1-way clutch No. 1 operates, lock counterclockwise rotation of the rear planetary
sun gear.
6. The planetary carrier revolves clockwise due to reaction force of the planetary long pinion.
7. The ring gear rotates clockwise.
8. The counter drive gear rotates clockwise for the ring gear and one.
9. The counter driven gear rotates counterclockwise.
10. The differential gear drive pinion rotates counterclockwise for the counter driven gear and one.
11. The differential gear rotates clockwise.
Engine Brake
1. The counter drive gear and planetary ring gear rotates counterclockwise.
2. The planetary long pinion rotates itself counterclockwise.
3. The planetary short pinion rotates itself clockwise.
4. The rear sun gear rotates clockwise due to rotation itself counterclockwise of the planetary long pinion,
but the driving force loses due to free to 1-way clutch No. 1 (F1). Therefore the engine brake does not
operate.
MANUAL FIRST GEAR
Manual First Gear
Position
SolenoidClutchBrake1-Way Clutch
Shift 1Shift 2TimingC1C2C3B1B2B3F1F2
D1stONONOFFONOFFOFFOFFOFFOFFOFFON
11stONONOFFONOFFOFFOFFOFFONOFFON

2006 Chevrolet Aveo
2006 TRANSMISSION Automatic Transaxle - Aisin (81-40LE) - Introduction (2 Of 2) - Aveo
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Fig. 446: Manual First Gear Schematics
Courtesy of GENERAL MOTORS CORP.
A. Front Planetary Gear
B. Rear Planetary Gear
D - 1st Gear

2006 Chevrolet Aveo
2006 TRANSMISSION Automatic Transaxle - Aisin (81-40LE) - Introduction (2 Of 2) - Aveo
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1. The input shaft rotates clockwise.
The forward clutch (C1) operates. Connect the input shaft to the front sun gear.
2. The front sun gear rotates clockwise.
3. The planetary short pinion rotates itself counterclockwise.
4. The planetary long pinion rotates itself clockwise.
5. The planetary carrier is going to rotate counterclockwise.
The one-way clutch No. 2 (F2) operates. The lock revolves counterclockwise of the planetary carrier.
6. The ring gear rotates clockwise.
7. The counter drive gear rotates clockwise for ring gear and one.
8. The counter drive gear rotates counterclockwise.
9. The differential gear drive pinion rotates counterclockwise for the counter driven gear and one.
10. The differential gear rotates clockwise.
Engine Brake
1. The counter drive gear and planetary ring gear rotates counterclockwise.
2. The planetary long pinion rotates itself counterclockwise.
3. The planetary short pinion rotates itself clockwise.
4. The planetary carrier revolves clockwise due to rotation itself counterclockwise of the planetary long
pinion, but driving force loses due to free of 1-way clutch No. 2 (F2). Therefore the engine brake does not
operate.
REVERSE
Reverse
Position
SolenoidClutchBrake1-W
Shift 1Shift 2TimingC1C2C3B1B2B3F1
R
V is
less
than 9
km/h
(5
mph)
ONONONOFFOFFONOFFOFFONOF

V is
greater
than
or
equal
ONONONOFFOFFOFFOFFOFFOFF OF

2006 Chevrolet Aveo
2006 TRANSMISSION Automatic Transaxle - Aisin (81-40LE) - Introduction (2 Of 2) - Aveo
Microsoft
Thursday, July 16, 2009 1:17:33 PMPage 464 © 2005 Mitchell Repair Information Company, LLC.

Fig. 447: Reverse Schematics
Courtesy of GENERAL MOTORS CORP.
to 9
km/h
(5
mph)

2006 Chevrolet Aveo
2006 TRANSMISSION Automatic Transaxle - Aisin (81-40LE) - Introduction (2 Of 2) - Aveo
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A. Front Planetary Gear
B. Rear Planetary Gear
Reverse Gear
1. The input shaft rotates clockwise.
The reverse clutch (C3) operates. Connect the input shaft to the rear planetary sun gear.
2. The planetary long pinion rotates itself counterclockwise.
3. The 1st and reverse brake (3) operates. Lock rotates the planetary carrier.
4. The ring gear rotates counterclockwise.
5. The counter drive gear rotates counterclockwise for the ring gear and one.
6. The counter driven gear rotates clockwise.
7. The differential gear drive pinion rotates clockwise for the counter driven gear and one.
8. The differential gear rotates counterclockwise.
Engine Brake
The driving force is connected to the input shaft directory without the 1-way clutch. Therefore the engine brake
operates.
TRANSMISSION GENERAL DESCRIPTION
The new automatic transmission AISIN (81-40LE) is an electronically controlled 4-speed automatic
transmission with lock-up mechanism.
The transmission is mainly composed of the torque converter with lock up clutch, newly developed 4-speed
planetary gear unit, the hydraulic control system and the electric control system.
Hydraulic Control System
Based on the hydraulic pressure created by the oil pump, the TCM sends signals to the solenoid and the
hydraulic control system governs the hydraulic pressure acting on the torque converter, planetary gear, clutches,
and brakes in accordance with the vehicle driving conditions.
Function of Components
NOTE: Lack of basic knowledge of this powertrain when performing diagnostic
procedures could result in incorrect diagnostic performance or damage to
powertrain components. Do not attempt to diagnose a powertrain problem
without this basic knowledge.

2006 Chevrolet Aveo
2006 TRANSMISSION Automatic Transaxle - Aisin (81-40LE) - Introduction (2 Of 2) - Aveo
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Fig. 448: Function Of Components
Courtesy of GENERAL MOTORS CORP.
Function of Components
ComponentFunction
7Forward ClutchConnects the input shaft and front sun gear.
3Direct ClutchConnects the input shaft and planetary carrier.
5Reverse ClutchConnects the input shaft and rear sun gear.
6O/D and 2nd BrakePrevents rear planetary sun gear from turning
either clockwise or counterclockwise.
42nd Brake
Prevents outer race of 8 from turning either
clockwise or counterclockwise, thus
preventing the rear sun gear turning

2006 Chevrolet Aveo
2006 TRANSMISSION Automatic Transaxle - Aisin (81-40LE) - Introduction (2 Of 2) - Aveo
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Thursday, July 16, 2009 1:17:33 PMPage 467 © 2005 Mitchell Repair Information Company, LLC.

Operations of Clutches and Brakes
Fig. 449: Operations Of Clutches And Brakes
Courtesy of GENERAL MOTORS CORP.
Operations of Clutches and Brakes
counterclockwise.
21st and Reverse BrakePrevents the planetary carrier from turning
either clockwise or counterclockwise.
8No. 1 One-Way ClutchWhen 4 is operating, this clutch prevents rear
sun gear from turning counterclockwise.
1No. 2 One-Way ClutchPrevents the planetary carrier from turning
counterclockwise.
Planetary Gear
These gears change the route through which
driving force is transmitted, in accordance
with the operation of each clutch and brake, in
order to increase or reduce the input and
output speed.

2006 Chevrolet Aveo
2006 TRANSMISSION Automatic Transaxle - Aisin (81-40LE) - Introduction (2 Of 2) - Aveo
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Transmission Range Reference
Clutch and BrakeOperation
C1Forward Clutch
Connects the intermediate shaft and the front
sun gear.
C2Direct ClutchConnects the input shaft and the planetary
carrier.
C3Reverse ClutchConnects the intermediate shaft and the rear
sun gear.
B1O/D and 2nd BrakeLock rear sun gear
B22nd BrakeLock rear sun gear
B31st and Reverse BrakeLock planetary carrier
F11-Way Clutch No. 1Lock counterclockwise rotation of the rear sun
gear, when B2 operations
F21-Way Clutch No. 2Lock counterclockwise rotation of the
planetary carrier
PositionSolenoidClutchBrakeOne-Way
Clutch
Shift 1Shift 2TimingC1C2C3B1B2B3F1F2
PONONOFFOFFOFFOFFOFFOFFOFFOFFOFF
R
V less
than 9
km/h (5
mph)
ONONOFFOFFOFFONOFFOFFONOFFOFF
V
greater
than or
equal to
9 km/h
(5 mph)
ONONONOFFOFFOFFOFFOFFOFFOFFOFF
NONONOFFOFFOFFOFFOFFOFFOFFOFFOFF
D
1stONONOFFONOFFOFFOFFOFFOFFOFFON
2ndONOFFOFFONOFFOFFOFFONOFFONOFF
3rdOFFOFFOFFONONOFFOFFONOFFOFFOFF
3-4OFFONON-
OFFON-
OFFONOFFOFF-
ONONOFFOFFOFF
4thOFFONOFFOFFONOFFONONOFFOFFOFF
2
1stONONOFFONOFFOFFOFFOFFOFFOFFON
2ndONOFFOFFONOFFOFFONONOFFONOFF
3rdOFFOFFOFFONONOFFOFFONOFFOFFOFF
11stONONOFFONOFFOFFOFFOFFONOFFON
2ndONOFFOFFONOFFOFFONONOFFONOFF

2006 Chevrolet Aveo
2006 TRANSMISSION Automatic Transaxle - Aisin (81-40LE) - Introduction (2 Of 2) - Aveo
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ELECTRONIC COMPONENT DESCRIPTION
Transmission Control Module (TCM)
The transmission control module (TCM) primarily controls shift points and lockup engagement. It is located on
the driver side under the instrument panel.
The transmission is controlled by an electronic shift system. The TCM processes input signals. From the
information received, the TCM controls the transmission hydraulic system.
The electronic shift system consists of the following components.
TCM
Shift solenoids (SS1 and SS2)
Pressure control solenoid (PCS)
Lockup solenoid
Input shaft speed (ISS) sensor
Output shaft speed (OSS) sensor
Transmission fluid temperature (TFT) sensor
Park/neutral position (PNP) switch
Park/Neutral Position (PNP) Switch
The PNP switch transmits the information which range includes the shift lever of the automatic transmission
(A/T) to the starter and TCM.
It is possible for the PNP switch to start an engine in only park (P) and neutral (N) prevention of reckless
driving
The PNP switch makes the backup lamp turn on when reversing.
It is used for PNP switch to shift control.
The PNP switch transmits the information by combination of starter and reverse circuit to the vehicle side
directl
y without TCM.

2006 Chevrolet Aveo
2006 TRANSMISSION Automatic Transaxle - Aisin (81-40LE) - Introduction (2 Of 2) - Aveo
Microsoft
Thursday, July 16, 2009 1:17:34 PMPage 470 © 2005 Mitchell Repair Information Company, LLC.

Fig. 450: PNP Switch Chart
Courtesy of GENERAL MOTORS CORP.

2006 Chevrolet Aveo
2006 TRANSMISSION Automatic Transaxle - Aisin (81-40LE) - Introduction (2 Of 2) - Aveo
Microsoft
Thursday, July 16, 2009 1:17:34 PMPage 471 © 2005 Mitchell Repair Information Company, LLC.