Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual - part 161

5A–22

BRAKE CONTROL SYSTEM

F05R200006

Basic Diagnostic Flow Chart

Step

Action

Yes

No

1

1. Verify complaint with the customer.
2. Questioning to customer.
3. Basic inspection (Refer to 

Basic inspection procedure)

Using TECH 2?

Go to 

Step 2

Go to 

Step 4

2

Verify DTC through: “F0: Diagnostic Trouble Codes.”

Is the DTC stored in the EHCU?

Clear code and

check for

repeatability.
Go to 

Step 3

Go to 

Step 5

3

1. Repair of faulty part.
2. Clear DTC.
3. Inspection of “ABS” W/L Illumination pattern with ignition SW

“ON”.

4. Test drive.

Does trouble repeat?

Repeat the

diagnosis it the

symptom or DTC

appears again

Go to 

Step 1

Go to 

Step 5

4

Verify DTC through: “F0: Diagnostic Trouble Codes.”

Is the DTC stored in the EHCU?

Clear code and

check for

repeatability

Go to 

Step 3

Trouble diagnosis

based on

symptom (Refer

to 

Symptom

Diagnosis)

Go to 

Step 3

5

1. Reconnect all components. Ensure that all component are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Finished

Go to 

Step 5

5A–23

BRAKE CONTROL SYSTEM

Basic Inspection Procedure

1. Basic Inspection of Service Brake 

Step

Action

Yes

No

1

Is the fluid level normal?

Go to 

Step 2

Replenish with

fluid

Go to 

Step 2

2

Does fluid leak?

Repair

Go to 

Step 3

Go to 

Step 3

3

Is the booster functioning properly?

Go to 

Step 4

Repair

Go to 

Step 4

4

Is the pad and rotor within specs?

Go to 

Step 5

Repair

Go to 

Step 5

5

Reconnect all components. Ensure all component are properly
mounted.

Was this step finished?

Finished

Go to 

Step 5

2. Ground Inspection 

Step

Action

Yes

No

1

Is there good contact with the ABS ground points?

Go to 

Step 2

Repair

Go to 

Step 2

2

Reconnect all components. Ensure that all component are
properly mounted.

Finished

Go to 

Step 2

5A–24

BRAKE CONTROL SYSTEM

EHCU Connector Pin-out Checks

D

Disconnect Electronic Hydraulic Control Module.

D

Perform checks with high impedance digital
multimeter J-39200 or equivalent.

No.

Circuit to be Tested

Ignition

Switch

Position

Multimeter

Scale/Range

Measure

between Pin

Number

Nominal Value

Note

1

Power supply

OFF

20DCV

1 (C–5)
2 (C–5)

11.5V to 14.5V

2

Ignition enable

OFF

20DCV

1 (C–6)
7 (C–6)

0V to 0.1V

ON

20DCV

1 (C–6)
7 (C–6)

11.5V to 14.5V

3

Stoplamp switch

OFF

20DCV

13 (C–6)

 7 (C–6)

10.5V to 14.5V

Press brake pedal

4

Ground connection

OFF

200

W

7 (C–6)
Ground

Less than 2

W

OFF

1

W

2 (C–5)
Ground

Less than 0.2

W

5

FL speed sensor

OFF

2k

W

 2 (C–6)

10 (C–6)

2.0k

W

 to 2.8k

W

Internal Resistance

OFF

200k

W

2 (C–6)
7 (C–6)

more than

100k

W

Insulation Resistance

OFF

200mACV

 2 (C–6)

10 (C–6)

more than

200mV

Turn wheel at 1RPS

6

FR speed sensor

OFF

2k

W

 3 (C–6)

11 (C–6)

2.0k

W

 to 2.8k

W

Internal Resistance

OFF

200k

W

3 (C–6)
7 (C–6)

more than

100k

W

Insulation Resistance

OFF

200mACV

 3 (C–6)

11 (C–6)

more than

200mV

Turn wheel at 1RPS

7

RR speed sensor

OFF

2k

W

 4 (C–6)

12 (C–6)

1.2k

W

 to 2.0k

W

Internal Resistance

OFF

200k

W

4 (C–6)
7 (C–6)

more than

100k

W

Insulation Resistance

OFF

200mACV

 4 (C–6)

12 (C–6)

more than

200mV

Turn wheel at 1RPS

5A–25

BRAKE CONTROL SYSTEM

Circuit Diagram

D05R200004