2 

Detect TCU power supply circuit 

See 3.5.7.8 P0603 P0604 P1604 P1701 P1703 

 

 

3 

Detect S10electromagnetic 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 7 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 S10electromagnetic valve 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 valve harness connectorJ-4

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A.  rotated ignition switch to OFF position . 

B. Disconnect the harness connector J-4 of the 

electromagnetic valve. 

C.    Measure the resistance between Terminal 7 of the 

electromagnetic valve harness connector J-4 and 
Terminal No.2 of the automatic control module 
J-1. 

D.    Measure the resistance between Terminal No.1 of 

the electromagnetic valve harness connector J-4 
and Terminal 7 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.7 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.1 of the electromagnetic valve harness connector J-4 and secure 

ground wire. 

Results 

Test Items 

Standard Value 

J-4 (7) — J-1(2) 

Less than 3 Ω 

J-4 (1) — J-1(7) 

Less than 3 Ω 

J-4 (7) — Reliable grounding voltage value 

0 V 

J-4 (1) — Reliable grounding resistance value 

Less than 3 Ω 

Does it conform to the standard value? 

 

 

 

4 Replace 

TCU 

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

1340

 
 

 

 

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. 

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3.5.7.20 P0985 P0986 

1. DTC 

description: 

DTC P0985 Electromagnetic valveS5 high current (short circuit) 

 

DTC P0986 Electromagnetic valveS5low 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 

P0985 

Feed back message of 
electromagnetic 
valveS5 exist short 
circuit 

P0986 

Feed back message of 
electromagnetic 
valveS5 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 

1342