CHEVROLET AVEO 2002 Service Repair Manual

Fig. 451: PNP Switch, Nut, Washer & Control Lever
Courtesy of GENERAL MOTORS CORP.
Shift Solenoid No 1, 2 (SS1, SS2)
Two shift solenoids are installed directly in the valve body. The solenoids operate of ON and OFF by the
control si
gnal from TCM. Combinations of 2 solenoids, SS1 (2) and SS2 (1) changes gear ranges.

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Fig. 452: Shift Solenoid No 1, 2 (SS1, SS2)
Courtesy of GENERAL MOTORS CORP.
Timing Solenoid
The timing solenoid (1) 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
appl
y and drain of forward clutch.

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Fig. 453: Timing Solenoid
Courtesy of GENERAL MOTORS CORP.
Lock-Up Solenoid
The lock-up solenoid (1) is installed in the valve body. It receives control signal from TCM.
The lock-up solenoid operates the lock-up valve inside the valve body and controls the torque converter lockup
function.

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Fig. 454: Lock-Up Solenoid
Courtesy of GENERAL MOTORS CORP.
Pressure Control Solenoid (PCS)
The PCS (1) 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 position.

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Fig. 455: Pressure Control Solenoid (PCS)
Courtesy of GENERAL MOTORS CORP.
Transmission Fluid Temperature (TFT) Sensor
The TFT sensor (1) provides the TCM with information on the transmission fluid temperature.
The TCM uses information from the TFT sensor to calculate the gear shift points and to engage the torque
converter loc
k-up function.

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Fig. 456: Transmission Fluid Temperature (TFT) Sensor
Courtesy of GENERAL MOTORS CORP.
Input Shaft Speed (ISS) Sensor
The ISS sensor (1) 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.

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Fig. 457: Input Shaft Speed (ISS) Sensor
Courtesy of GENERAL MOTORS CORP.
Output Shaft Speed (ISS) Sensor
The OSS sensor (1) is located on the upper position of the transaxle and detects the vehicle speed from the
rotation number of the differential
gear.

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Fig. 458: Output Shaft Speed (ISS) Sensor
Courtesy of GENERAL MOTORS CORP.
Shift Control
When the AFT is below the specified 15°C (59°F), 4th up-shift is prevented.
SPECIAL TOOLS AND EQUIPMENT
SPECIAL TOOLS
Special Tools
IllustrationTool Number/ Description

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DT 46450 (DW 240-010)
Auto Transaxle Pressure Gage Set
DT 46451 (DW 240-020)
Brake/Clutch Spring Compressor
DT 46452 (DW 240-030)
Forward Clutch Adapter
DT 46453 (DW 240-040)
Direct Clutch Adapter

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DT 46454 (DW 240-050)
Overdrive Brake Adapter
DT 46455 (DW 240-060-01)
Brake Spring Compressor Bolt/Nut
DT 46456 (DW 240-060-02)
Brake Spring Compressor Plate

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