Isuzu KB P190. Manual - part 157

BRAKE CONTROL SYSTEM   5A-35 

Diagnosis By “ABS” Warning Lamp 

Illumination Pattern 

In the event that there is abnormality in the “ABS”  

 

Warning Lamp Illumination Pattern while the key is in 
the “ON” position or if the warning lamp is actuated 
during driving, the fault should be diagnosed on an 
illumination pattern basis as follows: 

 

No. 

Condition 

“ABS” Warning Lamp Illumination Pattern 

Diagnostic 

1 

Warning Lamp is 
actuated normally 

 

Normal 

2 

Warning Lamp is not 
lit 

 

Warning Lamp lighting circuit 
trouble.  Go to No ABS 
Warning Lamp. 

3 Warning 

Lamp 

remains ON 

 

Diagnostic trouble codes are 
stored. 

Display diagnostic trouble 
codes and diagnose on a 
code basis according to the 
flow charts. 

If diagnostic trouble codes are 
not stored, it means warning 
lamp lighting circuit or meter 
trouble.   Go to ABS warning 
Lamp On Steady. 

4 

Warning Lamp is 
actuated while driving 

 

Diagnostic trouble codes are 
stored. 

Display diagnostic trouble 
codes and diagnose on a 
code basis according to the 
flow charts. 

 

Diagnostic Trouble Codes (DTCs) 

When the warning lamp in the meter remains ON, the 
EHCU stores the fault identification and disables the 
ABS. 

 

 

 

 

5A-36   BRAKE CONTROL SYSTEM 

How to display and erase DTCs: 

Note: 

• 

DTCs can be displayed also by TECH 2 use 
“Diagnostic Trouble Codes” mode. 

  1. How to start DTC display: 

• 

Confirm that the vehicle has come to a 
complete stop (with the wheels standing still) 
and that the brake pedal is not depressed.  
(Unless these two conditions are satisfied, the 
DTC display cannot be started.) 

• 

With IGN OFF, connect #12 terminal with #4 
terminal or # 5 terminal (GND) . Then turn IGN 
ON. 

 

 

 

The DLC is located behind the driver side kick panel 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

This illustration is based on RHD model 

 

350L300005 

 

• 

Keep #12 terminal connected with #4 terminal 
or # 5 terminal (GND) during DTC display.  (If 
#12 terminal is separated from #4 terminal or # 
5 terminal (GND) during display, display will 
stop.) 

 2. DTC display: 

• 

DTC is displayed by blinking warning lamp. 

• Double-digit 

display. 

• 

First, normal DTC 12 is displayed three times 
and then any other DTCs are displayed three 
times.  (If no other DTCs have been stored, the 
display of DTC 12 will be repeated.) 

 

  3. How to erase code: 

• 

Conduct brake switch ON/OFF operation 6 or 
more times within 3 seconds of self-diagnosis 
startup. 

• 

The code cannot be erased if more than 3 
seconds have passed since self-diagnosis 
startup, or if self-diagnosis has started with 
brake switched on (brake pedal depressed). 

 

 

 

B05RW0005 

BRAKE CONTROL SYSTEM   5A-37 

 4. Notes 

• 

If the following should occur during Diagnostic 
Trouble Code (DTC) display, the display will be 
discontinued.  After initial check, the status that 
is under the control of ABS will be returned : 
–  The vehicle starts (The wheels turn) or the 
brake pedal is depressed.  

• 

Up to 3 different codes can be stored.  

 

• 

If the ABS should turn OFF due to an 
intermittent defect, the system will be restored 
at the next key cycle, if the initial check finds no 
abnormality (when IGN is switched from OFF to 
ON). 

  5. An example of DTC display 

Display of DTC 23 

 

 

B05R100001 

After displaying DTC 12 three times, one DTC after 
another is displayed. DTC is displayed in numeric 
order. 

 

 

 

C05L300017 

The DTC 12 is displayed repeatedly. 

 

 

 
 

5A-38   BRAKE CONTROL SYSTEM 

Basic Diagnostic Flow Chart 

 

 

 

 

RTW75ALF000201 

 

Step Action  Value(s) 

Yes 

No 

1 

  1. Ignition “ON”, engine “OFF”. 

  2. Observe the ABS warning lamp. 

Note: If the starter switch is turned ON, the ABS 
warning lamp will turn on and then turn off after 3 
seconds. 

Is the ABS warning lamp “ON”? 

- 

Go to Step 2 

Go to “No 

ABS warning 

lamp” 

2  

1. 

Ignition 

“OFF”. 

  2. Install Tech 2. 

 3. Ignition “ON”. 

  4. Attempt to display ABS data with the Tech 2. 

Does the Tech 2 display ABS data? 

- 

Go to Step 5 

Go to Step 3