Geely Emgrand X7. Manual part — 342

3.5.7.25 P0976 P0977

1. DTC

description:

DTC P0976 On/off electromagnetic valve S2 high current (short circuit)

DTC P0977 On/off electromagnetic valve S2 low current (open circuit)

The transmission control unit (TCU) uses a switching electromagnetic valve to select among different clutch
elements within the transmission. During operation, the transmission control unit evaluates the current
actually-delivered current to open/close the electromagnetic valve and compares with the expected. If the current
is not in the pre-defined parameter currently, the DTC is set to display abnormal load of the transmission control
unit.

2. Conditions For Setting DTC and The Fault Position :

DTC Code

DTC Detection Strategy

Conditions For Setting The DTC

(Control Strategy)

Fault Position s

P0976

Feedback information of
on/off electromagnetic valve
S2 is that existence of short
circuit.

P0977

Feedback information of
on/off electromagnetic valve
S2 is that existence of open
circuit.

1. Ignition switch is in the “ON”

position.

2. Electromagnetic valve power on

3. TCU power supply voltage is
normal

1. Electromagnetic

valve

2. Electromagnetic

valve circuit

3. TCU

3. Circuit

sketch

1367

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
P0976 and P0977 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 P0976 P0977

Yes

DTCs other than DTCs P0976 and P0977

No

Gears switch

Main relay

JF-1

Reverse output

signal

Start relay JB-2

Shifter

Electromagnetic

valve

1368

2

Detect TCUpower supply circuit

See 3.5.7.8 P0603 P0604 P1604 P1701 P1703

3

Detect ON/OFF electromagnetic valveS2resistance

A. Turn the ignition switch to the OFF position.

B. Disconnect the harness connector J-4 of the

electromagnetic valve.

C. Measure the resistance between Terminals 22 and

20 of the electromagnetic valve harness
connector J-4.

Standard resistant value :20.8Ω-23.2Ω

电磁阀线束连接器

J-4

1

8

20

14

9

15

10

16

11

17

12

18

13

19

2

21

3

22

4

23

5

24

6

25

7

26

SL03-0036c

Does it conform to the standard value?

3

Detect ON/OFF electromagnetic valve S2 circuit

No

Yes

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

Next

No

Yes

Replace auto-transmission assembly, refer
to3.4.7.6 auto-transmission assembly replacement

Electromagnetic valveharness connectorJ-4

1369

A. rotated ignition switch to OFF position.

B. Disconnect the harness connector J-4 of the

electromagnetic valve.

C. Measure the resistance between Terminal No.22

of the electromagnetic valve harness connector
J-4 and Terminal 9 of the automatic control
module J-1.

D. Measure the resistance between Terminal No.20

of the electromagnetic valve harness connector
J-4 and Terminal No.15 of the automatic control
module J-1.

E. Turn the ignition switch to the ON position.

F. Measure voltage of electromagnetic valve

harness connector J-4No.22 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

G. Measure the resistance between Terminal No.20 of the electromagnetic valve harness connector J-4 and

secure ground wire.

Results

Test Items

Standard Value

J-4 (22) — J-1(9)

Less than 3 Ω

J-4 (20) — J-1(15)

Less than 3 Ω

J-4 (22) — Reliable grounding voltage value

0 V

J-4 (20) — Reliable grounding resistance value

Less than 3 Ω

Does it conform to the standard value?

4 ReplaceTCU

Refer to3.5.7.8 replace automatic transmission control module

5

Go to automatic transmission fresh process.

Refer to3.5.7.4 Automatic transmission refresh process

No

Yes

Circuit malfunction, repair circuit.

Next

Auto-transmissioncontrol module harness connectorJ-1

1370