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

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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