lock DAEWOO LACETTI 2004 Service Repair Manual

AISIN AUTOMATIC TRANSAXLE 5A2 – 205
DAEWOO V–121 BL4
Lower Valve Body
1. Key
2. Spring
3. 4–3 Shift Timing Valve
4. Key
5. Plug
6. 2–3 Shift Valve
7. Spring
8. Key
9. Plug
10. 1–2 Shift Valve
11. Spring
12. Key
13. Sleeve
14. Plunger15. Spring
16. Primary Regulator Valve
17. Key
18. Sleeve
19. Plunger
20. Spring
21. Lock–up Relay Valve
22. Key
23. Spring
24. Solenoid Modulator Valve
25. Solenoid Oil Strainer
26. Lower Modulator Valve
27. Spring
28. Key

5A2 – 206IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
Lower Valve Body Spring
MarkName (Color)Free length/Outer diameter mm
(in.)Total number of
coils
A4–3 shift timing valve No.1 (None)33.95 (1.3366) / 8.2 (0.323)12.5
BLow modulator valve (None)30.43 (1.1980) / 7.75 (0.3051)12.72
C2–3 shift valve (Red)25.50 (1.0039) / 9.73 (8.1694)7.75
D1–2 shift valve (Red)25.50 (1.0039) / 9.73 (8.1694)7.75
EPrimary regulator valve (None)50.53 (1.9894) / 13.6 (0.535)11.07
FLock up relay valve (Red)23.42 (0.9221) / 5.86 (0.2307)12.25
GSolenoid modulator valve (Yellow)32.13 (1.2650) / 8.0 (0.315)15.75

AISIN AUTOMATIC TRANSAXLE 5A2 – 207
DAEWOO V–121 BL4
Lower Valve Body Key
MarkRetainerHeight/Width/Thickness mm (in.)
A4–3 shift timing valve No.136.0 (1.417) / 5.0 (0.197) / 3.2 (0.126)
BLow modulator valve24.0 (0.945) / 5.0 (0.197) / 3.2 (0.126)
C2–3 shift valve10.0 (0.394) / 5.0 (0.197) / 3.2 (0.126)
D1–2 shift valve10.0 (0.394) / 5.0 (0.197) / 3.2 (0.126)
EPrimary regulator valve9.8 (0.386) / 5.2 (0.205) / 3.2 (0.126)
FLock up relay valve16.0 (0.630) / 5.0 (0.197) / 3.2 (0.126)
GSolenoid modulator valve24.0 (0.945) / 5.0 (0.197) / 3.2 (0.126)

AISIN AUTOMATIC TRANSAXLE 5A2 – 213
DAEWOO V–121 BL4
8. Install the pinion shaft so as to align the lock pin
holes on the pinion shaft and differential case.
9. Measure the side gear backlash while holding 1
pinion gear toward the case.
S Standard backlash:
0.05
0.20 mm (0.0020–0.0079 in.)
If the backlash is out of specification, install the
correct thrust washer to the side gear.
10. Referring to the table below, select thrust washers
which will ensure that the backlash is within the
specification.
Try to select washers of the same size for both
sides.
Thrust washer thickness : mm (in.)
Thickness
Thickness
0.95 (0.0374)1.10 (0.0433)
1.00 (0.0394)1.15 (0.0453)
1.05 (0.0413)1.20 (0.0472)
If the backlash is not within the specification,
install a thrust washer of a different thickness.
11. Using a hammer and punch, drive in the pin
through the case and hole in the pinion shaft.

5A2 – 218IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
TRANSAXLE DESCRIPTION
The new automatic transmission is an electronically con-
trolled 4–speed automatic transmission with Lock–up
mechanism.
The transmission is mainly composed of the torque con-
verter with lock up clutch, newly developed 4–speed plan-
etary gear unit, the hydraulic control system and the elec-
tric control system.
ELECTRONICAL COMPONENTS
Transmission Control Module (TCM)
The TCM primarily controls shift points and lockup en-
gagement. It is located on the driver side under the instru-
ment panel.
The transmission is controlled by an electronic shift sys-
tem. The Transmission Control Module (TCM) processes
input signals. From the information received, the TCM
controls the transmission hydraulic system.
The electronic shift system consists of the following :
S Transmission control module (TCM)
S Shift solenoids (SS1 and SS2)
S Pressure control solenoid (PCS)
S Lockup solenoid
S Input shaft speed (ISS) sensor
S Output shaft speed (OSS) sensor
S Transmission Fluid Temperature (TFT) sensor
S Transmission Range (TR) Switch
Transmission Range (TR) Switch
Transmission Range (TR) Switch transmits the informa-
tion which range includes shift lever of A/T to Starter and
TCM.
S It is possible for TR switch to start an engine in only
”P” and ”N”. (Prevention of reckless driving)
S TR switch makes backup lamp turn on when re-
versing.
S It is used for TR switch to shift control.
TR switch transmits the information by combination of
starter and reverse circuit to vehicle side directly without
TCM.
Shift Solenoid No 1,2 (SS1, SS2)
2 shift solenoids are installed directly in the valve body.
The solenoids operate of ON and OFF by the control sig-
nal from TCM. Combinations of 2 solenoids, SS1 and SS2
changes gear ranges.

AISIN AUTOMATIC TRANSAXLE 5A2 – 219
DAEWOO V–121 BL4
Timing Solenoid
Timing solenoid is installed directly in the valve body. The
solenoid operates of ON/OFF by the control signal from
TCM. The solenoid change timing valve of inside the valve
body, operate hydraulic control with apply and drain of for-
ward clutch.
Lock–Up Solenoid
Lock–up solenoid is installed in the valve body. It recieves
control signal from TCM.
Lock–up solenoid operates the lock–up valve inside the
valve body and controls the torque converter lockup func-
tion.
Pressure Control Solenoid (PCS)
The pressure control solenoid (PCS) is located inside the
valve body and regulates the transmission’s fluid pressure
system. It is internally grounded in the TCM and operates
when it is supplied with battery voltage from the TCM,
through the PCS and back to the TCM.
The battery voltage is controlled by a varying current from
the TCM.
The strength of the current is a function of the throttle posi-
tion.
Transmission Fluid Temperature (TFT)
Sensor
TFT sensor provides TCM with information on the trans-
mission fluid temperature.
The TCM uses information from the TFT sensor to calcu-
late the gear shift points and to engage the torque convert-
er lockup function.
Input Shaft Speed (ISS) Sensor
ISS sensor is located on the upper position of the transaxle
and detects A/T input speed from the rotation number of
the direct clutch drum.
They transmit to TCM as a signal.

5A2 – 222IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
AUTOMATIC TRANSAXLE SYSTEM
Function of Components
ComponentFunction
C1Forward ClutchConnects input shaft and front sun gear.
C2Direct ClutchConnects input shaft and planetary carrier.
C3Reverse ClutchConnects input shaft and rear sun gear.
B1O/D & 2nd BrakePrevents rear planetary sun gear from turning either clockwise
or counterclockwise.
B22nd BrakePrevents outer race of F1 from turning either clockwise or coun-
terclockwise, thus preventing the rear sun gear turning conter-
clockwise.
B31st & Reverse BrakePrevents planetary carrier from turning either clockwise or
counterclockwise.
F1No.1 One–way ClutchWhen B2 is operating, this clutch prevents rear sun gear from
counterclockwise.
F2No.2 One–way ClutchPrevents planetary carrier from turning counterclockwise.
Planetary GearThese gears change the route through which driving froce is
transmitted, in accordance with the operation of each clutch
and brake, in order to increase or reduce the input and output
speed.

AISIN AUTOMATIC TRANSAXLE 5A2 – 223
DAEWOO V–121 BL4
Operations of Clutches and Brakes
Clutch & BrakeOperation
C1Forward ClutchConnects intermediate shaft and front sun gear.
C2Direct ClutchConnects input shaft and Planetary carrier.
C3Reverse ClutchConnects intermediate shaft and rear sun gear.
B1O/D & 2nd BrakeLock rear sun gear
B22nd BrakeLock rear sun gear
B31st & Reverse BrakeLock Planetary carrier
F11way Clutch No.1Lock counterclockwise rotation of rear sun gear, when B2 op-
erations
F21way Clutch No.2Lock counterclockwise rotation of planetary carrier

AISIN AUTOMATIC TRANSAXLE 5A2 – 225
DAEWOO V–121 BL4
D–1st Gear
PositionSolenoidClutchBrake1 way
Clutch
Shift 1Shift 2TimingC1C2C3B1B2B3F1F2
D1stONONOFFONOFFOFFOFFOFFOFFOF
–FON
11stONONOFFONOFFOFFOFFOFFONOF
–FON
”D” – 1st Gear
1. Input shaft rotates clockwise.
S Forward clutch (C1) operates. (Connect input shaft to front sun gear)
2. Front sun gear rotates clockwise.
3. Planetary short pinion rotates itself counterclockwise.
4. Planetary long Pinion rotates itself clockwise.
5. Planetary carrier is going to rotate counterclockwise.
S One way clutch No.2(F2) operates. (Lock revolves counterclockwise of planetary carrier)

5A2 – 226IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
6. Ring gear rotates clockwise.
7. Counter drive gear rotates clockwise for ring gear and one.
8. Counter drive gear rotates counterclockwise
9. Differential gear drive pinion rotates counterclockwise for counter driven gear and one.
10. Differential gear rotates clockwise.
( Engine Brake)
1. Counter drive gear and Planetary ring gear rotates counterclockwise.
2. Planetary long pinion rotates itself counterclockwise.
3. Planetary short pinion rotates itself clockwise.
4. Planetary carrier revolves clockwise due to rotation itself counterclockwise of planetary long pinion, but driving
force loses due to free of 1 way clutch NO.2 (F2). Therefore Engine brake does not operate.