Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 1176

BRAKE CONTROL SYSTEM

5A–33

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

Chart A-4 Brake Pedal Feed Is Abnormal

Step

Action

Yes

No

1

Is ABS working?

Go to Step 2

Go to Step 4

2

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

Go to Step 3

Normal.

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

Repair.

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

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?

Normal.

(It is self

checking

sound.)

Go to Step 2

2

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

Normal.

(It is self

checking

sound.)

Go to Step 3

3

Check for the following condition:

• At the time of shift down or clutch operation.

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

road drive.

• At the time of high-speed turn.

• At the time of passing curb.

• At the time of operating electrical equipment switches.

• At the time of racing the engine (over 5000 rpm).
Did it occur under any one condition above?

ABS may

sometimes 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

BRAKE CONTROL SYSTEM

5A–35

Diagnostic Trouble Codes

Choose and trace an appropriate flowchart by the
numbers listed below to find fault and repair.

Code

Diagnosis

Item

Chart

No.

Flash out

Serial

Communications

12

—

—

—

—

13

C0285

2 WD Controller in 4WD Vehicle Controller

Wiring

B-8

14

C0271

RAM read/write error

Coil Integrated

Module

B-2

C0272

ROM checksum error

C0270

ALU function error

C0273

Inoperative isolation item

C0284

Loop time overrun

15

C0277

Low ignition voltage

Wiring

B-3

C0278

High ignition voltage

17

C0269

Excessive dump time

Coil Integrated

Module

B-4

18

C0274

Excessive isolation time

B-5

21

C0276

G-Sensor Failure

B-6

22

C0281

Brake switch Failure

B-7

24

C0282

Open or shorted 4

´4 input signal (4WD only)

Wiring

B-8

32

C0267

Open motor circuit or shorted ECU output

Motor

B-9

C0268

Stalled motor or open ECU output

35

C0265

Open relay circuit

Relay

B-10

C0266

Shorted relay circuit

41

C0245

FL Open isolation solenoid or shorted ECU output

Solenoid

B-11

C0247

FL Shorted isolation solenoid or open ECU output

42

C0246

FL Open dump solenoid or shorted ECU output

B-12

C0248

FL Shorted dump solenoid or open ECU output

43

C0241

FR Open isolation solenoid or shorted ECU output

B-13

C0243

FR Shorted isolation solenoid or open ECU output

44

C0242

FR Open dump solenoid or shorted ECU output

B-14

C0244

FR Shorted dump solenoid or open ECU output

45

C0251

Rear Open isolation solenoid or shorted ECU output

B-15

C0253

Rear Shorted isolation solenoid or open ECU output

46

C0252

Rear Open dump solenoid or shorted ECU output

B-16

C0254

Rear Shorted dump solenoid or open ECU output

5A–36

BRAKE CONTROL SYSTEM

51

C0225

FL Open or shorted sensor

Sensor or

Wiring

B-17

52

C0221

FR Open or shorted sensor

B-18

53

C0235

Rear Open or shorted sensor

B-19

61

C0226

FL Missing sensor signal

B-20

C0227

FL Sensor signal dropout

62

C0222

FR Missing sensor signal

B-21

C0223

FR Sensor signal dropout

63

C0236

Rear Missing sensor signal

B-22

C0237

Rear Sensor signal dropout

64

C0229

Simultaneous dropout of front sensor signal

B-23

65

C0238

Wheel speed error

Vehicle or

Sensor

B-24

—

C0286

Shorted indicator lamp

Wiring

—

Code

Diagnosis

Item

Chart

No.

Flash out

Serial

Communications