Isuzu KB P190. Service manual — part 162

BRAKE CONTROL SYSTEM 5A-55

Step Action Value(s)

Yes

No

7

Check the front left wheel speed sensor. Refer to
"Wheel Speed Sensor Inspection procedure"

Was a problem found?

-

Go to Step 10

Go to Step 8

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

Adjust the preload of the wheel bearing.

Is the action complete?

-

Verify repair

-

12

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

Is the action complete?

-

Verify repair

-

13

Repair the front 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 front left wheel speed sensor.

Is the action complete?

-

Verify repair

-

16

Repair or replace the front left speed sensor circuits.

Is the action complete?

-

Verify repair

-

17

Check the connection btween the EHCU and the
front 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-56 BRAKE CONTROL SYSTEM

DTC C0231 (Flash Code 31) Rear 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 rear right wheel

speed sensor harness connector.

2. Check installation condition for rear 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 rear right

wheel speed sensor.

2. Check the circuit between EHCU and rear 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-57

Step Action Value(s) Yes

No

4

1. Replace rear 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-58 BRAKE CONTROL SYSTEM

DTC C0232 (Flash Code 32) Rear 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 rear right wheel bearing rattling?

-

Go to Step 11

Go to Step 5

5

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

-

Go to Step 12

Go to Step 6

6

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

-

Go to Step 13

Go to Step 7