Geely Emgrand X7. Manual part — 331

3.5.7.16 P0729 P0731 P0732 P0733 P0734 P0735 P0736

1. DTC

description:

DTC P0729 6th speed transmission ratio error

DTC P0731 1st speed or M1 speed transmission ratio error

DTC P0732 2 nd speed transmission ratio error

DTC P0733 3rd speed transmission ratio error

DTC P0734 4th speed transmission ratio error

DTC P0735 5th speed transmission ratio error

DTC P0736 Reverse gear transmission ratio error

The transmission gear shift is controlled by the transmission control unit (TCU). The transmission control unit
receives the input information from the engine RPM sensor and other vehicle sensors. During each gear shift, it
selects the time to change gear, controls the gear shift feel and the hydraulic torque converter clutch (TCC).

2. Conditions For Setting DTC and The Fault Position :

DTC Code DTC Detection Strategy

Conditions For Setting The DTC
(Control Strategy)

Fault Position s

P0729

When do not shift ,system
observed transmission ratio of
6th speed is over the standard
value

P0731

It is observed that the
transmission ratio when the
shift gear is in the 1st speed
position exceeds the
calibration value when no gear
shift is carried out.

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. Output shaft speed of

transmission>300 rpm

1. Automatic

transmission fluid

2. Automatic

transmission fluid
level

3.

AutomaticTransmissi
on assembly

1323

P0732

When do not shift , system
observed transmission ratio of
2nd speed is over the standard
value

P0733

When do not shift , system
observed transmission ratio of
3rd speed is over the standard
value

P0734

It is observed that the
transmission ratio when the
shift gear is in the 4st speed
position exceeds the
calibration value when no gear
shift is carried out.

P0735

It is observed that the
transmission ratio when the
shift gear is in the 5th speed
position exceeds the
calibration value when no gear
shift is carried out.

P0736

It is observed that the
transmission ratio when the
shift gear is in the Gear R
position exceeds the
calibration value when no gear
shift is carried out.

6. Transmission shift lever is

not in N speed and parking
position.

3. Circuit

sketch

1324

T

C

U

电磁阀

换挡器

档位开关

LEVER

REVERSE

START

VBS5

VBS6

VBS7

V

BS8

VBS9

VBS1

0

O

n

O

ff

1

O

n

O

ff

2

O

n

O

ff

3

O

n

O

ff

4

EMM

INPUT

SHAFT

SPEE

D

SENSOR

OU

TPUT

SHAFT

t

SPE

ED

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
P0729, P0731, P0732, P0733, P0734, P0735 and P0736 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 P0729 P0731 P0732 P0733 P0734 P0735 P0736

Yes

DTCs other than DTCs P0729, P0731, P0732, P0733, P0734, P0735 and P0736

No

Gears switch

Main relay

JF-1

Reverse output

signal

Start relay JB-2

Shifter

Electromagnetic

valve

1325

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 switches 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

1326