Isuzu Rodeo UE. Manual — part 102

5A–31

BRAKE CONTROL SYSTEM

Chart TA-1 ABS Works Frequently But Vehicle Does Not Decelerate (Use TECH 2)

Step

Action

Yes

No

1

1. Connect TECH 2.
2. Make sure of the output conditions of each sensor.

Is the output of each sensor normal?

Go to Step 2

Replace wheel

speed sensor.

Go to Step 3

2

Return to Chart A-1.

Was the Chart A-1 finished?

Go to Step 3

Go to Step 2

3

Reconnect all components, ensure all components are properly
mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to Step 3

Chart A-2 Uneven Braking Occurs While ABS Works

Step

Action

Yes

No

1

Is there play in each or any sensor?

Repair.

Go to Step 5

Go to Step 2

2

Damage or powdered iron sticking to each or any sensor/sensor
ring?

Repair.

Go to Step 5

Go to Step 3

3

Is the output of each sensor normal? (Refer to chart C-1 or TC-1)

Go to Step 4

Replace sensor

or repair harness.

Go to Step 5

4

Is brake pipe connecting order correct?

Replace H/U.

Go to Step 5

Reconnect brake

pipe correctly.

Go to Step 5

5

Reconnect all components, ensure all components are properly
mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to Step 5

Chart TA-2 Uneven Braking Occurs While ABS Works (Use TECH 2)

Step

Action

Yes

No

1

1. Connect TECH 2.
2. Make sure of the output conditions of each sensor.

Is the output of each sensor normal?

Go to Step 2

Go to Step 3

2

Check piping by TECH 2 ACTUATOR TEST

Is the piping normal?

Replace EHCU.

Go to Step 4

Repair the pipe.

Go to Step 4

3

Repair and check the wheel speed sensor (Refer to chart B-20 to
B-23 , C-1 or TC-1).

Was the each chart finished?

Go to Step 4

Go to Step 3

4

Reconnect all components, ensure all components are properly
mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to Step 4

5A–32

BRAKE CONTROL SYSTEM

Chart A-3, TA-3 The Wheels Are Locked

Step

Action

Yes

No

1

Is ABS working?

Go to Step 2

Go to Step 6

2

Is vehicle speed under 10 km/h (6mph)?

Normal.

Go to Step 3

3

Is sensor output normal? (Chart C-1 or TC-1)

Go to Step 4

Replace sensor

or repair harness.

Go to Step 6

4

Is front 4WD controller normal?

Go to Step 5

Replace 4WD

controller or

repair harness.

Go to Step 6

5

Is hydraulic unit grounded properly?

Replace EHCU.

Go to Step 6

Correct.

Go to Step 6

6

Reconnect all components, ensure all components are properly
mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to Step 6

5A–33

BRAKE CONTROL SYSTEM

Chart A-4 Brake Pedal Feed Is Abnormal

Step

Action

Yes

No

1

Is the stop light actuated when the brake pedal is depressed?

Go to Step 2

Go to Step 3

2

1. Turn the ignition switch off.
2. Disconnected EHCU connector.

Is the check voltage EHCU connector terminals 13 to 7 when
brake pedal is depressed than battery voltage?

Go to Step 4

Harness NG

between brake

SW and EHCU.

Go to Step 6

3

Is stop light fuse normal?

Go to Step 5

Replace stop light

fuse.

Go to Step 6

4

Is the check continuity between EHCU connector terminals, 7 to
body grounded?

Go to Step 6

Repair body

grounded

harness.

Go to Step 6

5

Is brake SW normal?

Repair stop light

harness.

Go to Step 6

Replace brake

SW.

Go to Step 6

6

Reconnect all components, ensure all components are properly
mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to Step 6

5A–34

BRAKE CONTROL SYSTEM

Chart A-5, TA-5 Braking Sound (From EHCU) Is Heard While Not Braking

Step

Action

Yes

No

1

Is this the first vehicle start after engine start?

It is self checking

sound

Normal.

Go to Step 2

2

Is vehicle speed under 10 km/h (6 mph)?

It is self checking

sound

Normal.

Go to Step 3

3

Check for the following condition:

f

At the time of shift down or clutch operation.

f

At the time of low road friction drive (ice or snow road) or rough
road drive.

f

At the time of high-speed turn.

f

At the time of passing curb.

f

At the time of operating electrical equipment switches.

f

At the time of racing the engine (over 5000 rpm).

Did it occur under any one condition above?

ABS may

sometime be

actuated even

when brake pedal

is not applied.

Go to Step 4

4

Is there play in each or any sensor/wheel speed sensor rings?

Repair.

Go to Step 7

Go to Step 5

5

Damage or powdered iron sticking to each or any sensor/wheel
speed sensor ring?

Repair.

Go to Step 7

Go to Step 6

6

Is each sensor output normal? (Refer to chart C-1 or TC-1).

Check harness/

connector for

suspected

disconnection

If no

disconnection is

found, replace

Coil integrated

module.

Go to Step 7

Repair.

Go to Step 7

7

Reconnect all components, ensure all components are properly
mounted.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart”

Go to Step 7