Geely Emgrand X7. Manual part — 332

8 Troubleshooting

5. Maintenance

guide:

Replace Automatictransmission assembly , refer to3.5.7.6 Automatictransmission assembly replacement

Yes

No

Refer to 2.2.7.3 Intermittent Fault Inspection for
intermittent fault.

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3.5.7.17 P0741 P0742 P0744

1. DTC

description:

DTC P0741 Hydraulic torque converter clutch in the lock status

DTC P0742 Hydraulic torque converter clutch lock in the lock status

DTC P0744 Clutch slippage error of hydraulic torque converter

The automatic transmission controls the hydraulic torque converter clutch to lock or separate through the
hydraulic control system.

The piston pressure of the hydraulic torque converter lock clutch is decided by pressure controllable
electromagnetic valve (VBS). During operation, the transmission control unit (TCU) compares with the expected
by calculating the torque converter slide speed, If the torque converter slip sheet is not within the predefined
parameters, DTC will be set to indicate the torque converter lockout .

2. Conditions for setting DTC and the fault position :

DTC code

DTC detection strategy

Conditions for setting the DTC (control

ftrategy)

Fault Position s

P0741

When requesting Lock,
the hydraulic converter
always keeps Open.
When requiring Lock,
the slippage revolution
speed is higher than
50rpm and the time of
duration is more than
0.5s.

P0742

When requesting Open,
the hydraulic converter
always keeps Lock.
When requiring Open,
the slippage revolution
speed is lower than
50rpm, the engine torque
is more than 150Nm, and
the time of duration is
more than 0.5s.

P0744

The sliding speed of the
hydraulic torque
converter is not
controlled. The duration
is more than 0.5s.

1. ignition switch is in ON position

2. Engine speed >300 rpm

3. Engine is in the LHM

4. Transmission oil temperature >0°C

5. Transmission does not in the shift

process.

6. Shift lever is in the D gear position

1. Automatic

transmission fluid

2. Automatic

transmission fluid
level

3.

AutomaticTrans
mission assembly

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3. Circuit

sketch

T

C

U

电磁阀

换挡器

档位开关

LEVER

REVERSE

START

VBS5

VBS6

VBS7

VBS8

VBS

9

VBS1

0

O

n

O

ff

1

O

n

O

ff2

O

n

O

ff3

O

n

O

ff

4

EMM

INPU

T

SHAFT

SPEED

SE

NSOR

OUTPU

T

SHAFT

t

SPEED

SENSOR

25

26

10

11

9

8

13

12

24

23

22

21

20

7

6

5

4

3

2

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

J-4

1

18

8

1

3

2

12

14

4

11

12

9

10

15

2

1

4

3

6

5

7

7

J-5

5

16

17

J-5

4

J-5

1

J-5

6

J-5

2

J-5

3

4

11

10

10

15

3

CAN H

启动继电器

倒车信号

输出

主继电器

JF-1

IG2

JB-2

CAN L

10

20

J-3

J-1

J-3

J-2

J-2

J-3

J-3

J-3

J-1

8

J-3

J-3

J-3

J-3

J-3

J-3

J-3

J-3

J-1

J-1

J-1

J-1

J-1

J-1

J-1

J-1

J-1

J-1

J-1

J-1

IF36

NL03-2005c

4. Diagnostic

procedures:

Note: Before carrying out this diagnosis step, observe the data list on fault diagnosis tester and analyze the
accuracy of the data, as these will help with quick diagnosis.

1

Read the fault code again after clearing away the fault code to check if fault codes, except DTC
P0741, P0742 and P0744 exist in the control system.

A. Connect fault diagnosis tester to the datalink connector.

B. Rotated ignition switch to ON position

C. Switch on fault diagnostic device power supply

D. Clear DTC code.

E. Reset reading fault code, and check if DTCs meet setting condition of fault code in current

DTC Codes Shown

To Step

DTC P0741 P0742 P0744

Yes

DTCs other than DTCs P0741, P0742 and P0744

No

Gears switch

Main relay

JF-1

Reverse output

signal

Start relay JB-2

Shifter

Electromagnetic

valve

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2

Check if the automatic transmission leaks oil.

3

Check if the automatic transmission oil level and oil quality accord with the standard.

See 3.5.7.2 Automatic transmission oil level inspection procedures

4

Check if the automatic transmission has obvious mechanical damage.

5 Replace

AutomaticTransmission

assembly

Replace AutomaticTransmission assembly , refer to3.5.7.6 AutomaticTransmission assembly replacement

6

Go to automatic transmission fresh process.

Refer to3.5.7.4 Automatic transmission refresh process

7

Use fault diagnosis tester to confirm if DTC is stored again.

A. Connect fault diagnosis tester to the data link connector.

B. Rotated ignition switch to ON position.

C. Clear DTC code.

D. Start and run the engine at idle speed to warm up the engine for at least 5min.

E. Read control system DTC code again to confirm that the system has no DTC code exported.

No

Yes

Refer to3.4.7.6 fault diagnosis code (DTC) chapter
index

No

Yes

Refer to 3.4.7.3 Replacement Procedure of
Automatic Transmission Oil to fill or replace
automatic transmission oil.

No

Yes

Repair or replace the damaged part

Yes

No

Repair or replace the fault part

Next

Next

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