Chery Tiggo 5 (T21). Service manual — part 205

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Electronic control system consists of the components below:
 Transmission control unit (TCU)
 Pressure control solenoid
 Torque converter solenoid
 Clutch control solenoid
 Gear shift lever locking solenoid
 Turbine speed sensor
 Primary shaft speed sensor
 Secondary shaft speed sensor
 Oil pressure sensor
 Transmission fluid temperature sensor
 Transmission range sensor
 Manual mode switch

Transmission Range Sensor

The transmission range sensor is located at the top of the
transmission. It is used to input the current gear signal into
the TCU, and the TCU will output the operation requirements
to control the clutch and transmission for gear shifting. The
engine can be started only when the gear shift lever is at
parking (P) and neutral (N) gear, thus avoiding misoperation.

Manual Mode Switch

No matter whether the vehicle is static or running, you could
push the gear shift lever to shift between "M" and "D" gear.
On the gear shift mechanism panel, there are two gears of
"+" and "-" at the "M" gear, they are also called manual



shift-up and manual shift-down.

 M+: push the gear shift lever once to "M+" and the transmission will be increased one gear.
 M-: push the gear shift lever once to "M-" and the transmission will be reduced one gear.
 In the automatic mode, when the engine speed is too low, it will automatically shift down; and shift up when

the engine speed is high.

 In the manual mode, the driver should shift up the gear in advance based on the experience to prevent the

engine speed entering the red area of tachometer.

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Transmission Fluid Temperature Sensor

The transmission fluid temperature sensor is located in the
valve body. The sensor converts the transmission fluid
temperature signals into electronic signals and sends them
to the transmission control unit (TCU).

Primary Shaft Speed Sensor

The TCU calculates the primary shaft speed based on the
impulse signals. It is mainly used for the operations of torque
converter locking, clutch engagement and transmission
control.

Turbine/Secondary Shaft Speed Sensor

The TCU calculates the turbine and secondary shaft speeds
based on the impulse signals. It is mainly used for the
operations of torque converter locking, clutch engagement
and transmission control.

Fluid Pressure Sensor

The transmission fluid pressure sensor is used to monitor
the CVT pulley shaft pressure and send the signals to the
TCU.

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Oil Pressure Control Solenoid

The input and output pulley shaft oil pressure control
solenoids (1) and (2) are installed on the valve body. The
TCU receives accelerator pedal signals, gear signals and
speed signals, then the TCU sends the operation
requirements to start the oil pressure control solenoid for
changing speed ratio of the CVT.

Clutch Pressure Control Solenoid

The clutch pressure control solenoid (1) is installed on the
valve body. The TCU receives accelerator pedal signals,
gear signals and speed signals, then the TCU sends the
operation requirements to start the clutch pressure control
solenoid for changing clutch engagement.

Torque Converter Pressure Control Solenoid

The torque converter pressure control solenoid (1) is
installed on the valve body. The TCU receives accelerator
pedal signals, gear signals and speed signals, then the TCU
sends the operation requirements to start the torque
converter pressure control solenoid for locking the torque
converter.

Gear Shift Lock Solenoid

The gear shift lock solenoid (arrow) is installed in the
transmission gear shift control mechanism. Before moving
out of the "P" gear, the brake pedal should be fully
depressed and the ignition switch set to the "ON" position.

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Sport Mode Switch

The transmission is equipped with sport mode, which can be
switched on with the sport mode switch on the gear shift
indication panel.

System Control Logic

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S

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TCU

CAN

Turbine speed sensor

Primary shaft speed sensor

Secondary shaft speed sensor

Oil temperature sensor

Transmission range sensor

Mode select switch

Oil pressure sensor

TCU relay

Torque converter solenoid

Input pulley shaft oil pressure

control solenoid

Output pulley shaft oil pressure

control solenoid

Clutch control solenoid

Gear shift lock solenoid

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