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