Isuzu KB P190. Manual - part 165

BRAKE CONTROL SYSTEM   5A-67 

Step Action  Value(s) Yes 

No 

3 

  1. Ignition “ON”, engine “OFF”. 

  2. Select “Display DTCs” with the Tech 2. 

Note: Perform the various tests (actuator test, test 
run, brake test, etc.) then observe the DTC with a 
Tech 2. 

Are any DTCs stored? 

- 

Go to Step 4 

Verify repair 

4 Replace 

EHCU. 

Note: Check the EHCU type for specification, when 
the EHCU is replaced. 

(Specification ; 2WD model or 4WD model) 

Is the action complete? 

- 

Verify repair 

- 

 

5A-68   BRAKE CONTROL SYSTEM 

DTC C0245 (Flash Code 45) Front Left Hold Solenoid Valve Circuit 
DTC C0246 (Flash Code 46) Front Left Release Solenoid Valve Circuit 

 
 

 

 

 

RTW75ALF000301 

 

Step Action  Value(s) Yes 

No 

1 

Were the steps of the “Basic Diagnostic Flow Chart” 
performed? 

- 

Go to Step 2 

Go to Basic 

Diagnostic 

Flow Chart 

2  

1. 

Ignition 

“OFF”. 

  2. Check the EHCU circuit for an open, short to 

ground, or short to voltage. Also, check the EHCU 
ignition feed circuit for an open or short to ground 
and the EHCU ground circuit for an open or short to 
voltage. 

  3. If a problem is found, repair as necessary. 

Was a problem found? 

- 

Verify repair 

Go to Step 3 

BRAKE CONTROL SYSTEM   5A-69 

Step Action  Value(s) Yes 

No 

3 

  1. Ignition “ON”, engine “OFF”. 

  2. Select “Display DTCs” with the Tech 2. 

Note: Perform the various tests (actuator test, test 
run, brake test, etc.) then observe the DTC with a 
Tech 2. 

Are any DTCs stored? 

- 

Go to Step 4 

Verify repair 

4 Replace 

EHCU. 

Note: Check the EHCU type for specification, when 
the EHCU is replaced. 

(Specification ; 2WD model or 4WD model) 

Is the action complete? 

- 

Verify repair 

- 

 

5A-70   BRAKE CONTROL SYSTEM 

DTC C0251 (Flash Code 51) Rear Hold Solenoid Valve Circuit 
DTC C0252 (Flash Code 52) Rear Release Solenoid Valve Circuit 

 
 

 

 

 

RTW75ALF000301 

 

Step Action  Value(s) Yes 

No 

1 

Were the steps of the “Basic Diagnostic Flow Chart” 
performed? 

- 

Go to Step 2 

Go to Basic 

Diagnostic 

Flow Chart 

2  

1. 

Ignition 

“OFF”. 

  2. Check the EHCU circuit for an open, short to 

ground, or short to voltage. Also, check the EHCU 
ignition feed circuit for an open or short to ground 
and the EHCU ground circuit for an open or short to 
voltage. 

  3. If a problem is found, repair as necessary. 

Was a problem found? 

- 

Verify repair 

Go to Step 3