2007 ISUZU KB P190 brake sensor

FRONT WHEEL DRIVE 4C1-55




12. Bolt
13. Wheel Pin ; Front Hub
( 1 ) Scribe mark on hub to disc before disassembly to insure
proper assembly.
(2) Drive out the ABS sensor rotor using a metal bar and hammer through the two bolt holes.
• Discard the used ABS sensor rotor
Refer to the section Brake.





(3) Clamp hub and disc assembly in vise using protective pads
and remove six (6) disc to hub retaining bolts.




(4) Place hub on a suitable work surface and remove wheel
studs, as required, using a hammer.


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ISUZU KB P190 2007

4C1-56 FRONT WHEEL DRIVE
INSPECTION AND REPAIR
Make necessary correction or parts replacement if wear, damage or any other abnormal conditions are found
through inspection.
For inspection and servicing of disc caliper, and relative parts, and ABS parts, refer to Section Brakes.



• Hub
• Hub bearing, oil seal
• Knuckle spindle
• Disc
• Caliper
• ABS sensor rotor
• Cap, Hub flange, Shim, Snap ring
• Free wheeling hub parts (Option)
• Clutch, Knob, follower, inner, ring and
spring


Visual Check
Check the following parts for wear, damage or other abnormal
conditions.



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ISUZU KB P190 2007

FRONT WHEEL DRIVE 4C1-59


13. Wheel Pin
( 1 ) Place hub on a wood workbench or a block of wood,
approx. 6” by 6” to protect the wheel stud ends and threads.
(2) Install wheel stud using a hammer.
Be sure wheel stud is started squarely and seats completely.



(3) Align index marks and install hub to disc.



14. Bolt
Torque N ⋅m (kgf ⋅m/lb ⋅ft)
1 03 ( 10.5/76)


15. ABS sensor rotor
( 1 ) Set a new ABS sensor rotor, if replacement is required.
(2) Install the ABS sensor rotor in the hub, using special tools.
Installer : 5-8840-2789-0
Grip : 5-8840-0007-0
Refer to the section Brake.




16. Inner Bearing
Outer race ; outer bearing
Install the outer race by driving it into the hub.
Installer : 5-8840-2 119-0
Grip : 5-8840-0007-0


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ISUZU KB P190 2007

BRAKE CON TROL SY STE M 5 A


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 ............................................................................................................... 5 A-14
Parts Location ............................................................................................................... 5 A-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-2 5
SECTION 5A
BRAKE CONTROL SYSTEM
TABLE OF CONTENTS
Ser vice Precau tion ............................................................................................................ 5A -3
General Descrip tio n........................................................................................................... 5A -4

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ISUZU KB P190 2007

5A -1 BR AKE CON TROL SY STE M
Brake (E BD) Warning Lamp ......................................................................................... 5 A -25
Tech 2 Scan Tool .......................................................................................................... 5 A -2 6
Da ta List ( T ech 2 ).......................................................................................................... 5 A -32
Diagnostic Trouble Codes ................................................................................................ 5 A -33
Diagnosis By " A BS" Warning Lamp Illumination Patter n.............................................. 5 A -35
Basic Diagnostic Flow Chart ............................................................................................ 5 A -38
Basic Inspec tion Procedure ............................................................................................. 5 A -40
1. Basic Inspec tion of Ser vice Brake .......................................................................... 5 A -40
2. Ground Inspection .................................................................................................... 5 A -40
W heel Speed Sensor Inspec tion Procedure.................................................................... 5 A -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

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ISUZU KB P190 2007

BRAKE CON TROL SY STE M 5 A-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


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ISUZU KB P190 2007

5A-4 BRAKE CONTROL SYSTEM
General Description
EHCU has controlled ABS (Anti-lock Brake System) and
EBD (Electronic Brake-force Distribution System). ABS
works on all four wheels. EBD system works on rear 2
wheels. A combination of wheel speed sensor and
Electronic Hydraulic Control Unit (EHCU) can determine
when a wheel is about to stop turning and adjust brake
pressure to maintain best braking. This system helps the driver maintain greater control of
the vehicle under heavy braking conditions.

Note: The Electronic Hydraulic Control Unit (EHCU)
comprises the Hydraulic Unit (H/U) and Control Unit.













This illustration is based on RHD model

RTW 75AMF001101
Legend
(1) Electronic (6) Front Left W heel Speed Sensor
(2) Hydraulic (7) Rear Right W heel Speed Sensor
(3) Hydraulic Unit (H/U) (8) Rear Left W heel Speed Sensor
(4) Control Unit (9) G sensor (4W D only)
(5) Front Right W heel Speed Sensor (10) 2-4W D Control Unit (4W D only)


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ISUZU KB P190 2007

5A-8 BRAKE CONTROL SYSTEM
Pressure Isolation (Pressure Maintain)
The electronic-hydraulic control unit is activated when
the brakes are applied.
If the information from the wheel speed sensors
indicates excessive wheel deceleration (imminent
lockup), the first step in the anti-lock sequence is to
isolate the brake pressure being applied by the brake
pedal.
The microprocessor in the Control Unit sends a voltage
to the coil to energize and close the outlet valve. This
prevents any additional fluid pressure applied by the
brake pedal from reaching the wheel. W ith the outlet
valves closed, unnecessary increase in the brake
pressure is prevented.

RTW 75AMF000301
Legend
(1) Master Cylinder (5) Brake
(2) Brake Pedal (6) Outlet Valve
(3) Motor and Pump (7)Inlet Valve
(4) Accumulator



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ISUZU KB P190 2007