Isuzu KB P190. Manual — part 148

BRAKES 5

SECTION 5

BRAKES

TABLE OF CONTENTS

Section 5A Brake Control System. . . . . . . . . . . . . . . . . . . . . .. 593

Section 5B Anti-Lock Brake System . . . . . . . . . . . . . . . . . . . . . 680

PAGE

BRAKES 5C-1

Section 5C Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 700

PARKING BRAKE SYSTEM 5D-1

Section 5D Parking Brake System. . . . . . . . . . . . . . . . . . . . . . 770

TO MODEL INDEX

BACK TO MAIN INDEX

ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A

EHCU, Brake Pipe Diagram . . . . . . . . . . . . . . . . . . . . . . .. 5A-5

Hydraulic Unit (H/U) . . . . . . . . . . . . . . . . . . . . . . . . . .. 5A-6

Normal Braking . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5A-7

Pressure Isolation (Pressure Maintain). . . . . . . . . . . . . . . . . ... 5A-8

Pressure Reduction . . . . . . . . . . . . . . . . . . . . . . . . . .. 5A-9

Brake Release . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 5A-10

Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5A-11

Connector List. . . . . . . . . . . . . . . . . . . . . . . . . . . ... 5A-14

Parts Location . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 5A-16

EHCU Pin-Assignment. . . . . . . . . . . . . . . . . . . . . . . . .. 5A-20

System Components . . . . . . . . . . . . . . . . . . . . . . . . . 5A-22

Electronic Hydraulic Control Unit (EHCU). . . . . . . . . . . . . . . .. 5A-22

ABS Warning Lamp . . . . . . . . . . . . . . . . . . . . . . . . .. 5A-22

Wheel Speed Sensor (WSS) . . . . . . . . . . . . . . . . . . . . . 5A-22

G Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 5A-22

Normal and Anti-lock Braking . . . . . . . . . . . . . . . . . . . . . 5A-22

Electronic Brake-force Distribution (EBD) System. . . . . . . . . . . . 5A-23

Brake Pedal Travel . . . . . . . . . . . . . . . . . . . . . . . . ... 5A-23

Acronyms and Abbreviations. . . . . . . . . . . . . . . . . . . . . ... 5A-23

General Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5A-23

General Information . . . . . . . . . . . . . . . . . . . . . . . . . .. 5A-23

ABS Service Precautions . . . . . . . . . . . . . . . . . . . . . . . . 5A-23

Computer System Service Precautions . . . . . . . . . . . . . . . . . .. 5A-24

General Service Precautions . . . . . . . . . . . . . . . . . . . . . ... 5A-24

Note on Intermittents . . . . . . . . . . . . . . . . . . . . . . . . . 5A-24

Test Driving ABS Complaint Vehicles . . . . . . . . . . . . . . . . . . . 5A-24

"ABS" Warning Lamp . . . . . . . . . . . . . . . . . . . . . . . . ... 5A-25

Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . .. 5A-25

SECTION 5A

BRAKE CONTROL SYSTEM

TABLE OF CONTENTS

Service Precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . 5A-3

General Description. . . . . . . . . . . . . . . . . . . . . . . . . . ... 5A-4

5A-1 BRAKE CONTROL SYSTEM

Brake (EBD) Warning Lamp . . . . . . . . . . . . . . . . . . . . . . . 5A-25

Tech 2 Scan Tool . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5A-26

Data List (Tech 2) . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5A-32

Diagnostic Trouble Codes . . . . . . . . . . . . . . . . . . . . . . . . 5A-33

Diagnosis By "ABS" Warning Lamp Illumination Pattern . . . . . . . . . . . .. 5A-35

Basic Diagnostic Flow Chart . . . . . . . . . . . . . . . . . . . . . . . 5A-38

Basic Inspection Procedure . . . . . . . . . . . . . . . . . . . . . . . . 5A-40

1. Basic Inspection of Service Brake . . . . . . . . . . . . . . . . . . .. 5A-40

2. Ground Inspection . . . . . . . . . . . . . . . . . . . . . . . . . 5A-40

Wheel Speed Sensor Inspection Procedure. . . . . . . . . . . . . . . . . 5A-41

Symptom Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5A-42

ABS Works Frequently But Vehicle Does Not Decelerate . . . . . . . . . . . 5A-42

Uneven Braking Occurs While ABS Works . . . . . . . . . . . . . . . . 5A-43

The Wheels Are Locked. . . . . . . . . . . . . . . . . . . . . . . . 5A-43

Brake Pedal Feed Is Abnormal . . . . . . . . . . . . . . . . . . . . . 5A-44

Braking Sound (From EHCU) Is Heard While Not Braking . . . . . . . . . . 5A-45

No ABS Warning Lamp . . . . . . . . . . . . . . . . . . . . . . . . . 5A-46

ABS Warning Lamp ON Steady. . . . . . . . . . . . . . . . . . . . . 5A-47

DTC C0221 (Flash Code 21) Front Right Wheel Speed Sensor

Short Circuit or Circuit Open . . . . . . . . . . . . . . . . . . . . . . . 5A-48

DTC C0222 (Flash Code 22) Front Right Wheel Speed Sensor Signal Malfunction. . 5A-50

DTC C0225 (Flash Code 25) Front Left Wheel Speed Sensor Short Circuit or

Circuit Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5A-52

DTC C0226 (Flash Code 26) Front Left Wheel Speed Sensor Signal Malfunction . ... 5A-54

DTC C0231 (Flash Code 31) Rear Right Wheel Speed Sensor Short Circuit or

Circuit Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5A-56

DTC C0232 (Flash Code 32) Rear Right Wheel Speed Sensor Signal Malfunction. .. 5A-58

DTC C0235 (Flash Code 35) Rear Left Wheel Speed Sensor Short Circuit or

Circuit Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5A-60

DTC C0236 (Flash Code 36) Rear Left Wheel Speed Sensor Signal Malfunction . . 5A-62

DTC C0238 (Flash Code 38) Front Speed Sensor Correlation . . . . . . . . . ... 5A-64

DTC C0241 (Flash Code 41) Front Right Hold Solenoid Valve Circuit . . . . . . .. 5A-66

DTC C0242 (Flash Code 42) Front Right Release Solenoid Valve Circuit. . . . . . 5A-66

DTC C0245 (Flash Code 45) Front Left Hold Solenoid Valve Circuit. . . . . . . . 5A-68

DTC C0246 (Flash Code 46) Front Left Release Solenoid Valve Circuit . . . . . ... 5A-68

BRAKE CONTROL SYSTEM 5A-2

DTC C0251 (Flash Code 51) Rear Hold Solenoid Valve Circuit . . . . . . . . . . 5A-70

DTC C0252 (Flash Code 52) Rear Release Solenoid Valve Circuit. . . . . . . . 5A-70

DTC C0265 (Flash Code 65) Valve Relay Circuit Malfunction . . . . . . . . . . 5A-72

DTC C0267 (Flash Code 67) Return Pump Circuit Malfunction . . . . . . . . . . 5A-74

DTC C0271 (Flash Code 71) ECU Malfunction . . . . . . . . . . . . . . . . 5A-76

DTC C0276 (Flash Code 76) G Sensor Malfunction . . . . . . . . . . . . . . 5A-78

DTC C0277 (Flash Code 77) System Voltage Low . . . . . . . . . . . . . . .. 5A-80

DTC C0278 (Flash Code 78) System Voltage High. . . . . . . . . . . . . . .. 5A-80

DTC C0282 (Flash Code 82) 4 Wheel Drive State Input Signal Failure. . . . . . .. 5A-82

DTC C0285 (Flash Code 85) Control Module Vehicle Options Incorrect . . . . . .. 5A-84

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5A-86