Isuzu KB P190. Manual — part 166

BRAKE CONTROL SYSTEM 5A-71

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-72 BRAKE CONTROL SYSTEM

DTC C0265 (Flash Code 65) Valve Relay Circuit Malfunction

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-73

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-74 BRAKE CONTROL SYSTEM

DTC C0267 (Flash Code 67) Return Pump Circuit Malfunction

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