Isuzu KB P190. Service manual — part 167

BRAKE CONTROL SYSTEM 5A-75

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-76 BRAKE CONTROL SYSTEM

DTC C0271 (Flash Code 71) ECU 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-77

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-78 BRAKE CONTROL SYSTEM

DTC C0276 (Flash Code 76) G Sensor Malfunction

RTW75AMF001501

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 G sensor

harness connector.

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

Was a problem found?

-

Verify repair

Go to Step 3

3

1. Ignition “OFF”, disconnect the G sensor and EHCU.

2. Ignition “ON”, engine “OFF”.

3. Check the supply voltage to G sensor.

Was the value normal?

Battery

Voltage

Go to Step 5

Go to Step 4

4

Repair or replace the power supply circuit.

Is the action complete?

-

Verify repair

-

5

1. Check the circuit between EHCU and G sensor.

(Check circuit for an open, short to ground, or short
to voltage.)

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

Was a problem found?

-

Verify repair

Go to Step 6