Isuzu KB P190. Manual - part 160

BRAKE CONTROL SYSTEM   5A-47 

ABS Warning Lamp ON Steady 

 

Step Action  Value(s) 

Yes 

 

No 

1 

  1. Check the ABS warning lamp lighting circuit for a 

short. 

  2. If a problem found, repair as necessary. 

Was a problem found? 

- 

Go to Step 3 

Go to Step 2 

2 

  1. Check the ABS warning lamp lighting circuit at the 

meter for a short. Refer to METER, WARNING 
LIGHT AND INDICATOR LIGHT in 8 section. 

  2. If a problem is found, repair or replace the meter. 

Was a problem found? 

- 

Go to Step 3 

Go to Step 4 

3 

  1. Connect all connectors. 

  2. Ignition “ON”, engine “OFF”. 

  3. Wait for about 10 seconds. 

  4. Observe the ABS warning lamp. 

Is the ABS warning lamp turned “OFF”? 

- 

Verify repair 

Go to Step 4 

4 Replace 

EHCU. 

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

(Specification; 2WD or 4WD Model) 

Is the action complete? 

- Verify 

repair - 

 

5A-48   BRAKE CONTROL SYSTEM 

DTC C0221 (Flash Code 21) Front Right Wheel Speed Sensor Short Circuit or 

Circuit Open 

 

 

 

 

RTW75AMF001301 

 

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 a poor connection at the front right wheel 

speed sensor harness connector. 

  2. Check installation condition for front right wheel 

speed sensor. 

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

Was a problem found? 

- 

Verify repair 

Go to Step 3 

3 

  1. Ignition “OFF”, disconnect the EHCU and front right 

wheel speed sensor. 

  2. Check the circuit between EHCU and front right 

wheel speed sensor. (Circuit for an open, short to 
ground, or short to voltage.) 

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

Was a problem found? 

- 

Verify repair 

Go to Step 4 

BRAKE CONTROL SYSTEM   5A-49 

Step Action  Value(s) Yes 

No 

4 

  1. Replace front right wheel speed sensor. 

  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 5 

Verify repair 

5 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-50   BRAKE CONTROL SYSTEM 

DTC C0222 (Flash Code 22) Front Right Wheel Speed Sensor Signal 

Malfunction 

 

 

 

 

RTW75AMF001301 

 

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 the tire for the following conditions. 

• Tire specification 
• Wear of the outer surface 

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

Was a problem found? 

- 

Verify repair 

Go to Step 3 

3 

Note: 

This DTC is set when certain tire is rotated alone. 

 

Has certain tire been rotated alone by performing for 
lift-up or roller tester? 

- 

Verify repair 

Go to Step 4 

4 

Is the front right wheel bearing rattling? 

- 

Go to Step 11 

Go to Step 5 

5 

Is the front right wheel speed sensor or the sensor 
rotor rattling? 

- 

Go to Step 12 

Go to Step 6 

6 

Is iron powder attached to the front right wheel speed 
sensor or the sensor rotor? 

- 

Go to Step 13 

Go to Step 7