2.5.7 diagnostic message and steps 

2.5.7.1 Diagnosis descriptions 

Refer to 2.5.2 Description and Operation, get familiar with the system functions and operation 
before starting system diagnosis, so that it will help to determine the correct diagnostic steps, more 
importantly, it will also help to determine whether the situation described by the customer is 
normal. 

2.5.7.2 Visual inspection 

z  Inspect the after-service retrofitting device that may affect the engine anti-theft system. 

z  Check the system components that is easy to access to identify whether there is significant 

damage or potential faults. 

z  If the system shows the engine is locked, prior to the fault diagnostic Inspect and confirm 

whether the ignition key completed self learn, otherwise carry out the ignition key learn 
process. 

2.5.7.3 Anti-theft Engine Control Module Connector List 

NL02-2189b

1

2

4

6

8

3

5

7

IP24 发动机防盗控制模块线束连接器1

 

Terminal 
No . 

Terminal 
Definition 

Wiring 

Rated 
Working 
Voltage 

Working 
Current 

Terminal 
descriptions 

1 +B 

O/Y 

12V 

Less than 200 
mA 

Less than 50 
mA 

2 GND 

B  0V 

Less than 200 
mA 

Ground 

3 Ceiling 

lamp 

W/R 

12V 

Less than 50 
mA 

Anti-theft 
indicator of 
engine 

4 ON 

G/R 

12V 

Less than 200 
mA 

Ignition Switch 
Signal 

5 To 

R-Line 

L  12V 

Less than 50 
mA 

Engine Control 
Module 

IP24Engine anti-theft control module harness 

connector1 

383

Request Signal 

6 — 

— — 

—  — 

7 To 

K-Line 

Gr/P 

12V 

Less than 200 
mA 

Diagnostic 
Information 

8 W-Line  Gr/W 

12V 

Less than 200 
mA 

Communication 
with the Engine 
Control Module

 

NL02-2190b

IP25 发动机防盗控制模块线束连接器2

1

2

3

 

Terminal 
No . 

Terminal 
Definition 

Wiring 

Rated 
Working 
Voltage 

Working 
Current 

Terminal 
descriptions 

1 COIL 

A  W/G 

125 KHz 
Modulation 
Waveform 

— 

Antenna 
Signal 

2 COIL 

B  Gr/O 

125 KHz 
Modulation 
Waveform 

— 

Antenna 
Signal 

3 GND 

B  0 

V 

—  Ground 

 

IP25Engine anti-theft control module harness 

connector2 

384

2.5.7.4 Fault diagnostic code (DTC) table 

DTC 

Code Meaning 

Fault Cause Trouble-shooting 

Method 

9000 

Antenna Failure 
(Tested Only at 
Reading Anti-theft 
Transponder, other 
than Continuously 
Tested). 

EAS Coil Open 
circuit or short; 
anti-theft controller 
internal failure. 

1.  Inspect the connection between 

the EAS Coil and the Anti-theft 
controller jointer. 

2.  Inspect the EAS Coil plug 

harness for breaking off or 
collision. 

3.  Pluck off the EAS Coil plug and 

measure the resistance between 
IP25 terminal #1 and IP25 
terminal #2 with the resistance 
scale of the multimeter. The 
normal value is about 10-20 Ω, 
and if the resistance value 
approaches zero, the coil is 
short. If the resistance coil is 
open, measure the resistance 
between IP25(1) and IP25(3), 
and between IP25(2) and 
IP25(3). The normal value 
should be infinity, otherwise the 
coil is short or leaky. 

4.  If the coil has no fault, inspect 

the anti-theft controller with the 
interchange method to replace a 
matched new or reset anti-theft 
controller. Insert the key into 
the steering lock and turn to 
“ON” to read the fault code. If 
no DTC 9000 is shown, it 
indicates that there is certain 
fault in the anti-theft controller. 
Then use the replaced new 
controller to repeat the 
matching. 

B040 

W line Error, no 
electric injector 
response 

No electric injector 
controller response 
was received after 
anti-theft controller 
sending the 
communication 
request. 

1. Inspect whether anti-theft 

controller IP24 wire harness 
connector is plugged well. 
Inspect whether IP24 terminal 8 
(W line) and ECM wire harness 
are well connected, without 
short-circuit or bad connection. 
Inspect ECM. 

2.  Wire harness and connector are 

connected well. 

3.  Replace the anti-theft device 

and Inspect the above 
mentioned faults. If no fault 
occurred, the problem can be 
deemed as within the anti-theft 

385

device. 

4.  Replace the ECM and inspect 

the above faults. If no fault 
occurred, the problem can be 
deemed as within the ECM. 

B402 

W line short to 
ground, 

W line is short to 
the ground 

1.  Inspect the contact between the 

IP24 plug harnesses of the 
anti-theft controller; 

2.  Inspect the short circuit of the 

harness between the IP24 
terminal 8 (W line) and the 
electric injector. 

3.  Replace the anti-theft controller 

and inspect the above 
mentioned faults. If no fault 
occurred, the fault can be 
deemed within the anti-theft 
controller. 

4.  Replace the ECM and inspect 

the above faults. If no fault 
occurred, the problem can be 
deemed as within the ECM. 

B403 

W line short to 
power Supply 

W line is short to 
the anode of the 
battery . 

1.  Inspect the contact between the 

IP24 harnesses of the anti-theft 
controller 

2.  Inspect if the harness between 

the IP24 terminal 8 and ECM is 
short to the battery anode. 

3.  Replace the electric anti-theft 

controller and inspect the 
above-mentioned problems. If 
no problem occurred, the 
problem can be deemed as 
within the electric anti-theft 
controller. 

4.  Replace ECM, and inspect 

whether above faults exist. 

If not, it can be deemed that the 
electronic fuel injection faults. 

B055 

No Key was 
Detected 

Missing 
transponder in the 
key or damaged 
transponder or 
damaged EAS Coil 
results in that the 
anti-theft controller 
can not receive the 
response from the 
transponder. 

−  Inspect whether there is a 

transponder in the key. 

− 

Inspect whether the EAS Coil is 
normal. 

− Replace 

the 

transponder. 

386