Isuzu KB P190. Manual - part 164

BRAKE CONTROL SYSTEM   5A-63 

Step Action  Value(s) 

Yes 

No 

8 

Does the sensor rotor have missing tooth or saw-
toothed? 

- 

Go to Step 14 

Go to Step 9 

9 

  1. Clear the DTC. 

  2. Test run the vehicle, and check the DTC. 

Is the DTC displayed repeatedly? 

- 

Go to Step 18 

Go to Step 17

10 

Is the wheel speed sensor damaged or saw-toothed?

- 

Go to Step 15 

Go to Step 16

11 

Repair or replace the wheel bearing. 

Is the action complete? 

- 

Verify repair 

- 

12 

Repair or replace the rear left speed sensor or the 
sensor rotor. 

Is the action complete? 

- 

Verify repair 

- 

13 

Repair the rear left speed sensor or the sensor rotor.

Is the action complete? 

- 

Verify repair 

- 

14 

Replace the sensor rotor. 

Is the action complete? 

- 

Verify repair 

- 

15 

Replace the rear left wheel speed sensor. 

Is the action complete? 

- 

Verify repair 

- 

16 

Repair or replace the rear left speed sensor circuits. 

Is the action complete? 

- 

Verify repair 

- 

17 

Check the connection btween the EHCU and the rear 
left wheel speed sensor and repair as necessary 
Refer to "Note on Intermittents". 

Is the action complete? 

- 

Verify repair 

- 

18 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-64   BRAKE CONTROL SYSTEM 

DTC C0238 (Flash Code 38) Front Speed Sensor Correlation 

 

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. Check for the tire size of each wheels. 

  2. If the tire size is different, replace the tire. 

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

Was a problem found? 

- 

Verify repair 

Go to Step 3 

3 

  1. Check for the gear ratio of a front axle differential 

gear and a rear axle differential gear. 

  2. If the gear ratio is different, repair the gear ratio. 

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

Was a problem found? 

- 

Verify repair 

Go to Step 4 

4 

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 5 

Verify repair 

5 

  1. Check for a poor connection at the wheel speed 

sensor harness connector. 

  2. Check installation condition for wheel speed sensor.

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

Was a problem found? 

- 

Verify repair 

Go to Step 6 

6 

  1. Check condition for sensor rotor. 

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

Was a problem found? 

- 

Verify repair 

Go to Step 7 

7 

  1. Ignition “OFF” disconnect the EHCU and wheel 

speed sensor. 

  2. Check the circuit between EHCU and wheel speed 

sensor. (short ground, or short to voltage) 

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

Was a problem found? 

- 

Verify repair 

Go to Step 8 

8  

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 9 

9 

  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 10 

Verify repair 

BRAKE CONTROL SYSTEM   5A-65 

Step Action  Value(s) Yes 

No 

10 Replace 

EHCU. 

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

(Specification; 2WD model or 4WD model) 

Was the action complete? 

- 

Verify repair 

- 

 

5A-66   BRAKE CONTROL SYSTEM 

DTC C0241 (Flash Code 41) Front Right Hold Solenoid Valve Circuit 
DTC C0242 (Flash Code 42) Front Right 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