413 

No.315 Malfunction check list of malfunction free code   

1 

The ignition switch is in ON position (the engine is in stall state) while 
the ABS alarm lamp does not light up 

Possible cause 

[Description] 

ABS alarm lamp does not light up. It might be caused by the 

open circuit of the alarm lamp power return, burnt out of the bulb or damage 
of the alarm lamp controller.   

z

 

The fuse is burnt 

z

 

Bulb of ABS alarm lamp is 
burnt 

z

 

The power circuit is broken 

z

 

ABS alarm lamp controller is 

damaged 

 

Remove the ABS ECU joint, and the 
ignition switch is ON 
Does the alarm lamp light up? 

Inspect if bulb of ABS alarm 
lamp is burnt 

Inspect if the power return 
and the earth return of the 
alarm lamp in ABS harness is 
open 

Inspect the connector of the 
alarm lamp power return and 
the earth return 

Does the failure recur? 

Inspect if the wire connecting ABS 
alarm lamp controller and ECU in 
ABS harness is short or earthed 

Replace the alarm lamp 
controller

Check the ABS alarm lamp fuse in 
the central electric appliance box 

Inspect the fuse socket of the 
central electric appliance box 

See the maintenance 
importance of 
incidental trouble 

Replace it

Repair the fuse socket

Replace it 

Replace the harness

Repair the connector 

Replace the harness 

Abnormal 

Abnormal 

Normal 

Normal 

Yes 

Yes 

No 

Yes

No

Yes

No

Abnormal

Abnormal

Normal

Normal

 
 

 

 

414 

No.316 The ABS alarm lamp is normally open after the engine starts   

2 

The ABS alarm lamp is normally open after the engine is started.  

Possible cause 

[Description] 

The possible cause is that ABS alarm lamp controller is 

damaged or the ABS alarm lamp return is open.   

z

 

The alarm lamp controller is damaged 

z

 

Return of ABS alarm lamp controller is open 

z

 

ABS ECU is damaged 

Note: this failure mode confines to the condition of the system being capable of communicating with the failure 
diagnosis instrument (power supply of ABS ECU is normal) and no malfunction code appeared. 
 

 

No.317 ABS is in abnormal operation   

3 

ABS is in abnormal operation 

Possible cause 

[Description] 

This problem is closely related to the driving condition 

and the road surface, therefore the failure diagnosis is difficult to be 
made. However the following inspections can be made provided there 
is no malfunction code memory.   

z

 

The sensor is of improper installation 

z

 

There is something wrong with the sensor harness

z

 

The sensor is damaged 

z

 

The tooth ring is damaged 

z

 

The sensor is stained with foreign materials 

z

 

The wheel bearing is damaged 

z

 

ABS HCU (hydraulic unit) is damaged 

z

 

ABS ECU (electric control unit) is damaged 

 

Inspect if the wire between ECU and ABS alarm 
lamp controller is open 

Inspect the ABS alarm lamp controller 

Replace the harness

Replace it

Replace ABS ECU

Yes 

No 

Abnormal

Normal 

 
 

 

 

415 

 

Is the sensor installation correct?   

Inspect output voltage of the sensor 

Inspect each sensor 

Inspect each sensor tooth ring 

Carry out the hydraulic control unit 
diagnostic using the failure diagnosis 
instrument 

Replace ABS HCU 

Inspect the wheel bearing 
clearance 

Inspect ABS ECU socket and 
the central connector 

Refer to the 
maintenance gist 
of incidental 
trouble 

Remove ABS ECU and inspect 
ABS 
Does the resistence value 
between the following terminals 
of the harness meet the standard 
value?  Standard value: 1.0 ~ 
1.3 k; shake the sensor harness 
and the connector 
simultaneously during the 
measurement 
MK20 I 

MK20 I/E 

front left: 4 – 11    1 – 2 
front right: 3 – 18   19 – 20 
rear left: 2 – 10    5 – 6 
rear right: 1 – 17    22 – 23 
Normal Replace ABS ECU 

Does the failure recur? 

Install it correctly

Yes 

Abnormal 

Abnormal

Replace it 

Normal 

Normal

Replace it

Abnormal 

Normal

Normal

Normal

Yes

Abnormal

Abnormal

Abnormal

Abnormal 

No

Repair or replace it

Repair the joint 

Repair the harness or the 
connector 

Replace ABS ECU

 
 

 

 

416 

No.318 The brake pedal stroke is too long   

4 

The brake pedal stroke is too long 

Possible cause 

[Description]   Visually inspect if there is any exterior 
leakage or mechanical failure.  Check if there is air in the 
system by the air exhausting method. Check if the normally 
closed valve is leaked with the function test of failure 
diagnosis hydraulic unit.   

z

 

The braking fluid is leaked 

z

 

The normally closed valve is leaked 

z

 

There is air in the system 

z

 

The brake disc is of heavy wear 

z

 

The hand braking is improper adjusted 

 

 

Diagnostic and inspect the sealing property of 
the normally closed valve with the failure 
diagnosis hydraulic control unit 

Inspect worn condition of the brake disc 

Visually inspect if the hydraulic pipe joint is leaked 

Inspect the hand braking adjust device 

Air exhaust inspection 

Tighten the pipe joint as required

Replace the brake disc

Replace the hand braking adjust device 

Carry out the air exhaust again

Replace HCU (hydraulic control unit)

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Normal 

Normal 

Normal 

Normal