2 

Detect TCUpower supply circuit 

See 3.5.7.8 P0603 P0604 P1604 P1701 P1703 

 

 

3 

Detect S8electromagnetic 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 5 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 S8electromagnetic 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

1359

 
 

 

A.  rotated ignition switch to OFF position. 

B.  Disconnect the harness connector J-4 of the 

electromagnetic valve. 

C.    Measure the resistance between Terminal 5 of the 

electromagnetic valve harness connector J-4 and 
Terminal 4 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.5 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 (5) — J-1(4) 

Less than 3 Ω 

J-4 (1) — J-1(7) 

Less than 3 Ω 

J-4 (5) — 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 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

1360

 
 

 

 

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 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. 

 

 

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.

1361

 
 

 

3.5.7.24 P0973 P0974 

1. DTC 

description: 

DTC P0973 

On/off electromagnetic valve S1 high current (short circuit) 

 

DTC P0974 

On/off electromagnetic valve S1 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 

P0973 

Feedback information of 
on/off electromagnetic valve 
S1 is that existence of short 
circuit. 

P0974 

Feedback information of 
on/off electromagnetic valve 
S1 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 

1362