Geely Emgrand X7. Manual part — 321

3.5.7.8 P0603 P0604 P1604 P1701 P1703

1. DTC

description:

DTC P0603

TCU Self-learning data memory error

DTC P0604

Reach to TCU self-learning data limit

DTC P1604

TCU EMM data error

DTC P1701

TCU power supply voltage is low

DTC P1703

TCU power supply voltage is high

The transmission control unit (TCU) controls the transmission through the variable flow electromagnetic valve
and switching electromagnetic valve. The transmission control unit operates under a voltage ranging from 8 to
16V and usually consumes less than 4A current and needs to change gear when the current consumption reaches
10A.

If the transmission element is worn to a certain extent, the transmission control unit TCU can compensate these
differences within the range of the service life of the transmission through self-learning function, thereby ensuring
the shift quality. However, in case the parts in the transmission are worn to a certain point, the gear shifting
quality can not be ensured no matter how the transmission control unit (TCU) teaches oneself; and at this tie, the
transmission control unit (TCU) shall report a fault code.

2. Conditions for setting DTC and the gault position:

DTC code

DTC detection strategy

Conditions for setting the DTC

(control strategy)

Fault positions

P0603

Detect hard part circuit

P0604

Detect hard part circuit

P1604

EMM digital image stored in

the TCU was damaged and

lost

Ignition switch is in ON position

P1701

System pressure is less than

work voltage of

electromagnetic valve

1. ignition switch is in the opening

position

2. Engine speed >300 r/min

3. Transmission control unit power

supply voltage <8 V for 0.5 s

1. TCU

2. TCU power supply

circuit

3. TCUgrounding

circuit

1283

P1703

System voltage is higher

than work required voltage

of electromagnetic valve

1. ignition switch is in the opening
position

2. Voltage of transmission control
unit power supply >17 V for 60s

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
P0603, P0604, P1604, P1701, and P1703 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

Gears switch

Main relay

JF-1

Reverse output

signal

Start relay JB-2

Shifter

Electromagnetic

valve

1284

DTC codes shown

To step

DTC P0603, P0604, P1604, P1701, P1703

Yes

DTC except for DTC P0603, P0604, P1604, P1701, P1703

No

2

Check power supply and charging system

A. Check negative and positive connection of battery is loosed

B. Check engine harness connector was damaged or loosed

3

Check TCUpower supply circuit

A. Rotated ignition switch to OFF position.

B. Disconnect TCU harness connector J-1

C. Rotated ignition switches to ON position.

D.

Measure resistance value of automatic
transmission harness connector J-1No.16
terminal and reliable grounding

E. Measure voltage value of automatic transmission

harness connector J-1No.16 terminal and reliable
grounding

自动变速器控制模块线束连接器

J-1

1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

SL03-0034c

Results

Test items

Standard value

J-1(16)-Reliable grounding resistance value

10 kΩ or higher

J-1(16)-Reliable grounding voltage value

11 - 14 V

Does it conform to the standard value?

No

Yes

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

Yes

No

Connect to harness connector or replace harness

Auto-transmissioncontrol module harness connectorJ-1

1285

4

Check TCU grounding circuit

A. Rotated ignition switch to OFF position.

B. Disconnect TCU harness connector J-1

C. Rotated ignition switches to ON position.

D. Measure resistance value of automatic transmission harness connector J-1No.8 terminal and reliable

grounding

E. Measure voltage value of automatic transmission harness connector J-1No.8 terminal and reliable grounding

Results

Test Items

Standard value

J-1(16)-Reliable grounding resistance value

Less than 3 Ω

J-1(16)-Reliable grounding voltage value

0 V

Does it conform to the standard value?

5 Replace

TCU

Refer to3.5.7.8 replace automatic transmission control module

6

Go to automatic transmission fresh process.

Refer to 3.5.7.4 replace 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

Circuit fault, repair circuit.

No

Yes

Circuit fault, repair circuit.

Next

Next

1286