2 

Detect TCUpower supply circuit 

See 3.5.7.8 P0603 P0604 P1604 P1701 P1703 

 

 

3 

Detect ON/OFF electromagnetic valveS4resistance 

 

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 24 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 S4 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

1379

 
 

 

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.24 

of the electromagnetic valve harness connector 
J-4 and Terminal No.11 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.24 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 (24) — J-1(11) 

Less than 3 Ω 

J-4 (20) — J-1(15) 

Less than 3 Ω 

J-4 (24) — 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

1380

 
 

 

 

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.

1381

 
 

 

3.5.7.28U0100U0121 U0146 U0415 

1. DTC 

description: 

DTC U0100 Circling CAN information from the ECU is unavailable. 

 

DTC U0121 Circling CAN information from the ABS is unavailable. 

 

DTC U0146 Lost with Gateway communication 

 

DTC U0415 The CAN signal of the TCU is out of the range or invalid. 

Control area network (CAN) bus is used for sharing the vehicle system information in the control unit which is 
connected with the bus. If the transmission control unit does not regularly receive specific information sent to the 
CAN bus through the electronic control unit, the transmission control unit will trigger a DTC with respect to 
communication. 

2.  Conditions For Setting DTC and The Fault Position : 

DTC Code 

DTC Detection Strategy 

Conditions For Setting The DTC 

(Control Strategy) 

Fault Position s 

U0100 

U0121 

U0146 

U0415 

Hardware Circuit Inspection 

1.Ignition switch is in the “ON” 
position  

2.Communication signals lost，

logic signal 

is error 

 

1. ECU,TCU, 

ABS 

2. CAN 

bus 

3. Circuit 

sketch 

1382