Isuzu KB P190. Manual — part 155
BRAKE CONTROL SYSTEM 5A-27
Actuator Test
There are 8 different menus available for this test.
The state of each circuit can be tested by using these
menus. Especially when DTC cannot be detected, a
faulty circuit can be diagnosed by testing each circuit by
means of these menus.
Even when DTC has been detected, the circuit tests
using these menus could help discriminate between a
mechanical fault and an electrical fault.
In all cases test condition; Engine stops with the key
turned to the "ON" position. To be more specific, the
test is conducted with the brake pedal stepped on after
stepping once and releasing.
RTW75ASH000201
Brake Bleed
Purpose: The purpose of this command is air bleeding
of brakes line.
Using the Tech 2 at following operation.
Air Bleeding procedure:
1. Connect the Tech 2 with the vehicle, and select
"Actuator Test" menus.
2. Select a "Brake Bleed" menu from the "Actuator
Test" menus.
RTW75ASH000301
3. According to indication of Tech 2 press the
"Confirm".
RTW75ASH000401
5A-28 BRAKE CONTROL SYSTEM
4. Check the EHCU part number. Press the "Confirm".
RTW75ASH000501
5. Check a DTC is not detected. Press the "Confirm".
RTW75ASH000601
6. According to indication of Tech 2 press the
"Confirm".
RTW75ASH000701
7. According to indication of Tech 2 press the
"Confirm".
RTW75ASH000801
BRAKE CONTROL SYSTEM 5A-29
8. According to indication of Tech 2 press the
"Confirm".
RTW75ASH000901
9. According to indication of Tech 2 press the
"Confirm".
RTW75ASH001001
10. According to indication of Tech 2 press the
"Confirm".
RTW75ASH001101
Return Pump Relay Test
Test condition: Engine stops with the key turned to the
"ON" position. To be more specific, the test is
conducted with the brake pedal stepped on after
stepping once and releasing.
Test Procedure:
1. Connect the Tech 2 with the vehicle, and select
"Actuator Test" menus.
2. Select a " Return Pump Relay Test " menu from the
"Actuator Test" menus.
The circuit is normal if the pump motor is operated in
accordance with Tech 2 instruction.
Front Left Hold Valve Test
Purpose: The purpose of this test is to detect brake pipe
and valve line harness wire for incorrect connections
and valve problem.
This test will help you confirm the result of your repair
service including the removal/ reinstallation of brake
pipe, valve line harness and valve.
Test conditions: The ignition key is in the "ON" position
with the four wheels lifted up. The brake pedal is
stepped on, released and stepped on again with the
parking brake released.
Test Procedure:
1. Connect Tech 2 with the vehicle, and select
"Actuator Test" menus.
2. Select a "Front Left Hold Valve Test" menu from
the "Actuator Test" menus.
3. Step on the brake pedal.
5A-30 BRAKE CONTROL SYSTEM
4. Release the brake pedal.
5. Make sure that the front left hold solenoid valve
"ON" aimed at by Tech 2 and the wheel locked
position are the same.
If different, check brake pipe, valve line harness wiring
and hydraulic unit. Repair is needed if abnormality is
found.
Front Left Release Valve Test
Purpose: The purpose of this test is to detect brake pipe
and valve line harness wire for incorrect connections and
valve problem.
This test will help you confirm the result of your repair
service including the removal/ reinstallation of brake
pipe, valve line harness and valve.
Test conditions: The ignition key is in the "ON" position
with the four wheels lifted up. The brake pedal is stepped
on, released and stepped on again with the parking
brake released.
Test Procedure:
1. Connect Tech 2 with the vehicle, and select
"Actuator Test" menus.
2. Select a "Front Left Release Valve Test" menu from
the "Actuator Test" menus.
3. Step on the brake pedal.
4. Make sure that the front left release solenoid valve
"ON" aimed at by Tech 2 and the wheel released
position are the same.
If different, check brake pipe, valve line harness wiring
and hydraulic unit. Repair is needed if abnormality is
found.
Front Right Hold Valve Test
Purpose: The purpose of this test is to detect brake pipe
and valve line harness wire for incorrect connections and
valve problem.
This test will help you confirm the result of your repair
service including the removal/ reinstallation of brake
pipe, valve line harness and valve.
Test conditions: The ignition key is in the "ON" position
with the four wheels lifted up. The brake pedal is stepped
on, released and stepped on again with the parking
brake released.
Test Procedure:
1. Connect Tech 2 with the vehicle, and select
"Actuator Test" menus.
2. Select a "Front Right Hold Valve Test" menu from
the "Actuator Test" menus.
3. Step on the brake pedal.
4. Release the brake pedal.
5. Make sure that the front right hold solenoid valve
"ON" aimed at by Tech 2 and the wheel locked
position are the same.
If different, check brake pipe, valve line harness wiring
and hydraulic unit. Repair is needed if abnormality is
found.
Front Right Release Valve Test
Purpose: The purpose of this test is to detect brake pipe
and valve line harness wire for incorrect connections
and valve problem.
This test will help you confirm the result of your repair
service including the removal/ reinstallation of brake
pipe, valve line harness and valve.
Test conditions: The ignition key is in the "ON" position
with the four wheels lifted up. The brake pedal is
stepped on, released and stepped on again with the
parking brake released.
Test Procedure:
1. Connect Tech 2 with the vehicle, and select
"Actuator Test" menus.
2. Select a "Front Right Release Valve Test" menu
from the "Actuator Test" menus.
3. Step on the brake pedal.
4. Make sure that the front right release solenoid valve
"ON" aimed at by Tech 2 and the wheel released
position are the same.
If different, check brake pipe, valve line harness wiring
and hydraulic unit. Repair is needed if abnormality is
found.
Rear Hold Valve Test
Purpose: The purpose of this test is to detect brake pipe
and valve line harness wire for incorrect connections
and valve problem.
This test will help you confirm the result of your repair
service including the removal/ reinstallation of brake
pipe, valve line harness and valve.
Test conditions: The ignition key is in the "ON" position
with the four wheels lifted up. The brake pedal is
stepped on, released and stepped on again with the
parking brake released.
Test Procedure:
1. Connect Tech 2 with the vehicle, and select
"Actuator Test" menus.
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