6 

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. 

 

 

7 Troubleshooting 

5. Maintenance 

guide: 

Replace Automatic transmission control module, refer to3.5.7.8 replace automatic transmission control module 

Replace Automatictransmission assembly, refer to3.5.7.6 Automatictransmission assembly replacement 

Yes

No

Next

Refer to 2.2.7.3 Intermittent Fault Inspection for 
intermittent fault.

1351

 
 

 

3.5.7.22 P099B P099C 

1. DTC 

description: 

DTC P099B High current of electromagnetic valveS7(short circuit) 

 

DTC P099C electromagnetic valveS7low current(open circuit) 

The transmission control unit (TCU) uses a variable pressure electromagnetic valve to regulate the hydraulic 
pressure. The hydraulic system controls the clutch in the transmission to realize the torque transmission. 

The transmission control unit (TCU) can control a certain amount of pressure by adjusting the current of the 
electromagnetic valve to enter the clutch and the transmission of the clutch torque is directly related to the current 
of the electromagnetic valve. 

During operation, the transmission control unit evaluates the current actually delivered to the electromagnetic 
valve and compares with the expected. If there is no 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 

P099B 

Feed back message of 
electromagnetic 
valveS7 exist short 
circuit 

P099C 

Feed back message of 
electromagnetic 
valveS7 exist 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 

1352

 
 

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 
P0998 and P0999 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 P099B P099C 

Yes 

DTCs other than DTCs P099B and P099C 

No 

 

Gears switch 

Main relay 

JF-1

Reverse output 

signal

Start relay JB-2

Shifter 

Electromagnetic 

valve 

1353

 
 

 

 

 

2 

Detect TCU power supply circuit 

See 3.5.7.8 P0603 P0604 P1604 P1701 P1703 

 

 

3 

Detect S7electromagnetic valve resistance 

 

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 4 and 

1 of the electromagnetic valve harness connector 
J-4. 

Standard resistant value :4.11Ω-4.17Ω 

 

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 S7 electromagnetic valve circuit 

 

No

Yes

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

Next 

No

Yes 

Replace auto-transmission assembly, refer to 
3.4.7.6 auto-transmission assembly replacement 

Electromagnetic valve harness connectorJ-4

1354