405 

No.305 Diagnoses to the ABS system failure 

Flow chart of ABS malfunction diagnosis 

 

Incidental malfunction 

Continuous malfunction   

Clear the malfunction 
code 

Carry out the maintenance by reference to the 

incidental trouble diagnostic gist 

Record the malfunction 

code 

Carry out the maintenance by reference to the malfunction code 

malfunction diagnostic gist 

Clear the malfunction 

code 

The key switch is power off, dismount the malfunction 

diagnosis instrument 

Real car driving inspection 

End 

Start 

Connect the malfunction diagnosis instrument under 

the power off condition 

Turn the key switch to "ON" 

Enter into the ABS system at the address location 

Can it communicate? 

Carry out the inspection refer to the 

malfunction code free malfunction 

Enter into the malfunction inquiry system at the 

function location 

Normal

No 

Yes 

 
 

 

 

406 

No.306 Quick index list of malfunction clearance   

Index of malfunction code malfunction check list 

Diagnostic code 

Malfunction description 

Diagnostic content 

Check list No. 

65535 

Electronic control unit 

Damaged 

 

01276 

ABS hydraulic pump 

The motor is out of service 

1 

00283 

Left front wheel sensor 

00285 

Right front wheel sensor 

00290 

Left rear wheel sensor 

00287 

Right rear wheel sensor 

Electro and mechanical failure 

2, 3, 4 

01044 

ABS code error 

 

5 

00668 

Power supply terminal 30 

 

6 

01130 

Abnormal in ABS operation 

The signal is unreasonable 

7 

No.307 Index of malfunction code free malfunction check list   

Malfunction status 

Check list No. 

Turn the ignition switch to "ON" (the engine is in stall state) and the ABS alarm lamp does not light up 

1 

The alarm lamp does not light off when the engine starts up 

2 

Braking forces at both sides are unequal 

The braking force is inadequate 

ABS is in operation when the brake pedal is stamped slightly (the vehicle is 
in stationary state) 

ABS is in operation when the brake pedal is stamped slightly (the vehicle is 
in driving state) 

ABS is in abnormal 
operation 

The brake pedal vibrates violently when the ABS is in operation 

3 

The brake pedal stroke is too long 

4 

Very big force is required to stamp the brake pedal 

5 

There is no malfunction code output (communication with the malfunction diagnosis instrument is 
unavailable) 

6 

 

 
 

 

 

407 

No.308 Malfunction check list of malfunction code   

1 

Malfunction code: 01276 

Possible cause 

 
[Description] 

When the speed exceeds 20km/h, the ABS ECU will monitor abnormal 

operation of the motor, then a malfunction code will be recorded.   
[Prompt]  When this malfunction code is displayed, it means the harness between the 
motor and ECU is loose. Function test of the hydraulic unit of the failure diagnosis 
instrument can be used to drive the motor to carry out the test.   

z

 

The power is broken or 
earthed 

z

 

The motor harness is loose 

z

 

The motor is damaged 

Note: 
The motor is incapable of being driven if the battery is of excess discharging, so the battery voltage must be 
confirmed to be normal before the motor driving test is made.    The vehicle must be at the stationary state 
when the motor driving test is made. 

 

Unplug the motor harness and connect 
the battery power directly to the motor 
plug, does the motor still operate? 

Inspect the fuse and the ABS ECU joint 

Connect the motor harness 
Turn the ignition switch to "ON" 
  Clear the trouble code 
Carry out the hydraulic control unit diagnostic 
using the failure diagnosis instrument 

Does the failure recur? 

Refer to "gist of incidental trouble 
maintenance" 

Replace the hydraulic control unit 

Replace the fuse or the harness 

Replace the electronic control unit 

Abnormal 

Abnormal 

Yes 

Normal 

Normal 

No 

 
 

 

 

408 

No.309 The malfunction codes are 00283, 00285, 00290 and 00287 

(mechanical malfunction)   

2 

Malfunction codes: 00283, 00285, 00290 and 00287 (mechanical 
malfunction) 

Possible cause 

[Description] 

The malfunction code will appear when open circuit of the return 

can not be checked out and there is no signal output when the speed is above 
20km/h.  
[Prompt]    It may be caused by miss installation of the sensor, short of the sensor 
coil or the harness, ultra large air gap between the sensor and the tooth ring, or the 
damage or the tooth ring.   

z

 

Miss installation of the sensor 

z

 

Short of the sensing coil or the harness

z

 

Ultra big of the air gap between the 
sensor and the tooth ring 

z

 

Miss installation of the tooth ring 

z

 

Malfunction of ABS ECU 

 

 

Is the sensor installation correct? 

Inspect the sensor output voltage at 
the ABS25 core socket 

Inspect each sensor 

Inspect each sensor tooth ring 

Inspect the wheel bearing 
clearance 

Inspect the sensor output voltage at 
the ABS25 core socket 

Install it correctly 

Inspect if the sensor resistance is normal 

Replace ABS ECU 

Replace it 

Repair or replace 

Abnormal 

Normal 

Replace it 

Abnormal 

Abnormal 

Abnormal 

No 

Yes 

Normal 

Normal 

Normal