2004 ISUZU TF SERIES ABS

BRAKE CONTROL SYSTEM 5A-1


SECTION 5A
BRAKE CONTROL SYSTEM
CONTENTS

Service Precaution ............................................................................................................. 5A-4
General Description ........................................................................................................... 5A-5
EHCU, Brake Pipe Diagram .......................................................................................... 5A-6
Hydraulic Unit (H/U)....................................................................................................... 5A-7
Normal Braking ......................................................................................................... 5A-8
Pressure Isolation (Pressure Maintain) .................................................................. 5A-9
Pressure Reduction .................................................................................................. 5A-10
Brake Release ........................................................................................................... 5A-11
Circuit Diagram.............................................................................................................. 5A-12
Connector List ............................................................................................................... 5A-13
Part Location ................................................................................................................. 5A-15
EHCU Pin-outs ............................................................................................................... 5A-17
System Components ..................................................................................................... 5A-19
Electronic Hydraulic Control Unit (EHCU) .............................................................. 5A-19
ABS Warning Lamp .................................................................................................. 5A-19
Wheel Speed Sensor (WSS)..................................................................................... 5A-19
G-Sensor ................................................................................................................... 5A-19
Normal and Anti-lock Braking ................................................................................. 5A-19
Electronic Brake-force Distribution (EBD) System ................................................ 5A-20
Brake Pedal Travel.................................................................................................... 5A-20
Acronyms and Abbreviations ....................................................................................... 5A-20
General Diagnosis ............................................................................................................. 5A-20
General Information ...................................................................................................... 5A-20
ABS Service Precautions.............................................................................................. 5A-20
Computer System Service Precautions....................................................................... 5A-21
General Service Precautions........................................................................................ 5A-21
Note on Intermittents .................................................................................................... 5A-21
Test Driving ABS Complaint Vehicles ......................................................................... 5A-21
"ABS and Brake" Warning Lamp ................................................................................. 5A-22
Normal Operation .......................................................................................................... 5A-22

5A-2 BRAKE CONTROL SYSTEM

Brake (EBD) Warning Lamp.......................................................................................... 5A-22
Tech 2 Scan Tool ........................................................................................................... 5A-23
DATA LIST (Tech 2) ....................................................................................................... 5A-26
Actuator Test (Tech 2)................................................................................................... 5A-27
Diagnostic Trouble Codes................................................................................................. 5A-30
Diagnosis By "ABS" Warning Lamp Illumination Pattern .............................................. 5A-32
Basic Diagnostic Flow Chart ............................................................................................ 5A-35
Basic Inspection Procedure .............................................................................................. 5A-37
1. Basic Inspection of Service Brake ........................................................................... 5A-37
2. Ground Inspection .................................................................................................... 5A-37
Wheel Speed Sensor Inspection Procedure .................................................................... 5A-38
Symptom Diagnosis........................................................................................................... 5A-39
ABS Works Frequently But Vehicle Does Not Decelerate ......................................... 5A-39
Uneven Braking Occurs While ABS Works ................................................................. 5A-40
The Wheels Are Locked ................................................................................................ 5A-40
Brake Pedal Feed Is Abnormal ..................................................................................... 5A-41
Braking Sound (From EHCU) Is Heard
While Not Braking ....................................................................................................... 5A-42
No ABS Warning Lamp ................................................................................................. 5A-43
DTC C0221 (Flash Code 21) Front Right Wheel Speed Sensor
Short Circuit or Circuit Open ......................................................................................... 5A-44
DTC C0222 (Flash Code 22) Front Right Wheel Speed Sensor Incorrect Signal.......... 5A-46
DTC C0223 (Flash Code 23) Front Right Wheel Speed Sensor
Signal - Tooth Chipping................................................................................................... 5A-48
DTC C0225 (Flash Code 25) Front Left Wheel Speed Sensor Short Circuit or
Circuit Open .................................................................................................................... 5A-50
DTC C0226 (Flash Code 26) Front Left Wheel Speed Sensor Incorrect Signal ............ 5A-52
DTC C0227 (Flash Code 27) Front Left Wheel Speed Sensor Signal - Tooth
Chipping ........................................................................................................................... 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 Incorrect Signal ........... 5A-58
DTC C0233 (Flash Code 33) Rear Right Wheel Speed Sensor Signal - Tooth
Chipping ........................................................................................................................... 5A-60

BRAKE CONTROL SYSTEM 5A-3

DTC C0235 (Flash Code 35) Rear Left Wheel Speed Sensor Short Circuit or
Circuit Open .................................................................................................................... 5A-62
DTC C0236 (Flash Code 36) Rear Left Wheel Speed Sensor Incorrect Signal ............. 5A-64
DTC C0237 (Flash Code 37) Rear Left Wheel Speed Sensor Signal - Tooth
Chipping ........................................................................................................................... 5A-66
DTC C0238 (Flash Code 38) Tire Diameter Error ............................................................. 5A-68
DTC C0241 (Flash Code 41) Front Right Isolation Solenoid Circuit Open or
Shorted to Ground ........................................................................................................... 5A-69
DTC C0242 (Flash Code 42) Front Right Dump Solenoid Circuit Open or Shorted
to Ground.......................................................................................................................... 5A-69
DTC C0243 (Flash Code 43) Front Right Isolation Solenoid Circuit Shorted to
Battery............................................................................................................................... 5A-69
DTC C0244 (Flash Code 44) Front Right Dump Solenoid Circuit Shorted to
Battery............................................................................................................................... 5A-69
DTC C0245 (Flash Code 45) Front Left Isolation Solenoid Circuit Open or
Shorted to Ground ........................................................................................................... 5A-71
DTC C0246 (Flash Code 46) Front Left Dump Solenoid Circuit Open or Shorted
to Ground.......................................................................................................................... 5A-71
DTC C0247 (Flash Code 47) Front Left Isolation Solenoid Circuit Shorted to
Battery............................................................................................................................... 5A-71
DTC C0248 (Flash Code 48) Front Left Dump Solenoid Circuit Shorted to
Battery............................................................................................................................... 5A-71
DTC C0251 (Flash Code 51) Rear Isolation Solenoid Circuit Open or Shorted to
Ground .............................................................................................................................. 5A-73
DTC C0252 (Flash Code 52) Rear Dump Solenoid Circuit Open or Shorted to
Ground .............................................................................................................................. 5A-73
DTC C0253 (Flash Code 53) Rear Isolation Solenoid Circuit Shorted to Battery ......... 5A-73
DTC C0254 (Flash Code 54) Rear Dump Solenoid Circuit Shorted to Battery .............. 5A-73
DTC C0265 (Flash Code 65) Fail Safe Relay (FSR) Shorted to Ground ......................... 5A-75
DTC C0266 (Flash Code 66) Fail Safe Relay (FSR) Shorted to Battery.......................... 5A-75
DTC C0267 (Flash Code 67) ABS Motor Shorted to Ground .......................................... 5A-77
DTC C0268 (Flash Code 68) ABS Motor Shorted to Battery ........................................... 5A-77
DTC C0271 (Flash Code 71) ECU Failure or Valve +B Circuit Open .............................. 5A-79
DTC C0274 (Flash Code 74) ABS Operation Long Time ................................................. 5A-80
DTC C0276 (Flash Code 76) G-Sensor Malfunction ........................................................ 5A-82

BRAKE CONTROL SYSTEM 5A-5

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
C05L300010
Legend

(1) Electronic (6) Front Left Wheel Speed Sensor
(2) Hydraulic (7) Rear Right Wheel Speed Sensor
(3) Hydraulic Unit (H/U) (8) Rear Left Wheel Speed Sensor
(4) Control Unit (9) G-sensor (4WD only)
(5) Front Right Wheel Speed Sensor (10) 2-4WD Control Unit (4WD only)

BRAKE CONTROL SYSTEM 5A-13

Connector List
No. Connector face No. Connector face
B-23
Green
Meter-A C-44
WhiteStop Light Switch
B-24
Green
Meter-B C-53
OrangeABS Sensor Front-RH
B-48
Black
G-sensor C-54
OrangeABS Sensor Front-LH
B-54
White
I2 C-67
BlackEHCU
B-56
White
J/B I4 C-107
WhiteJ/B E2
B-58
Black
Data Link Connector C-108
WhiteJ/B E1
B-62
White
Ignition Switch (IGSUB : G1) C-109
SilverBody-LH ; Ground
B-63
White
Ignition Switch (IGSUB : G2) F-4
Gray ABS Sensor Rear
C-2
Silver
Engine Room-RH ; ground H-6
WhiteEngine Room ~ INST
C-36
Silver
Engine Room-LH ; Ground H-7
WhiteEngine Room ~ INST

5A-18 BRAKE CONTROL SYSTEM

EHCU Side
Pin No.
(Harness
side
Pin No.) Pin Function Wire
Color Typical Value Note
14
(C67-17) ABS Warning Lamp YEL More than 10V
15
(C67-16) Not Used - -
16
(C67-15) Not Used - -
17
(C67-14) G-Sensor Signal YEL/BLK 2.0~3.0V
(MAX4.0V,MIN1.0V) 4WD Only
It checks in a flat place
(0G:2.5V)
DTC C0276, C0285
18
(C67-13) Front Left Wheel Speed Sensor (+) RED 12

1.5V DTC C0225, C0226,
C0227
19
(C67-12) Rear Right Wheel Speed Sensor (+) ORN 12

1.5V DTC C0231,C0232,
C0233
20
(C67-26) EBD (Brake) Warning Lamp LT BLU More than 10V
21
(C67-25) Starter Switch ON
(Power Supply and Switch Position) BLU/WHT Battery Voltage Control Unit
DTC C0277,C0278
22
(C67-22) Not Used - -
23
(C67-23) Not Used - -
24
(C67-22) Not Used - -
25
(C67-21) Transfer (2-4WD Control Unit) GRY Pulse Signal
(High 4.5V, Low 1.5V) 4WD Only
DTC C0282
26
(C67-20) Front Left Wheel Speed Sensor (-) WHT High Level: 1.28~2.2V
Low Level: 0.5~0.86V DTC C0225, C0226,
C0227
27
(C67-19) Rear Left Wheel Speed Sensor (+) GRY/BLU 12

1.5V
DTC C0235, C0236,
C0237
28
(C67-18) Rear Left Wheel Speed Sensor (-) WHT/BLU High Level: 1.28~2.2V
Low Level: 0.5~0.86V DTC C0235, C0236,
C0237

BRAKE CONTROL SYSTEM 5A-19

System Components
Electronic Hydraulic Control Unit (EHCU), four Wheel
Speed Sensors, two Warning Lamps, and G-sensor.

Electronic Hydraulic Control Unit (EHCU)

The EHCU consists of ABS control circuits, fault
detector, and a fail-safe. It drives the EHCU according
to the signal from each sensor, cancelling ABS to return
to normal braking when a malfunction has occurred in
the ABS.
The EHCU has a self-diagnosing function which can
indicate faulty circuits during diagnosis.
The EHCU is mounted on the engine compartment rear
left side. It consists of a motor, solenoid valves fail safe
relay.
Solenoid Valves: Reduces or holds the caliper fluid
pressure for each front brake or both rear brakes
according to the signal sent from the EHCU.
Buffer chamber: Temporarily holds the brake fluid that
returns from the front and rear brake so that pressure
of front brake can be reduced smoothly.
Motor: Drives the pump according to the signal from
EHCU.
Fail safe Relay: When failure occurs in ABS.
The power supply to solenoid Valve is cut.

ABS Warning Lamp


825L300001
Vehicles equipped with the Anti-lock Brake System
have an amber “ABS” warning lamp in the instrument
panel. The “ABS” warning lamp will illuminate if a
malfunction in the Anti-lock Brake System is detected
by the Electronic Hydraulic Control Unit (EHCU). In
case of an electronic malfunction, the EHCU will turn
“ON” the “ABS” warning lamp and disable the anti-lock
braking function.

The “ABS” warning lamp will turn “ON” for
approximately three seconds after the ignition switch is
to the “ON” position.
If the “ABS” warning lamp stays “ON” after the ignition
switch is the “ON” position, or comes “ON” and stays
“ON” while driving, the Anti-lock Brake System should
be inspected for a malfunction according to the
diagnosis procedure.

Wheel Speed Sensor (WSS)
It consists of a sensor and a rotor. The sensor is
attached to the knuckle on the front wheels and to the
rear wheels.
The rotor is press-fit in the axle shaft.

G-Sensor
The G-sensor detects the vehicle deceleration speed
and sends a signal to the EHCU. In 4WD operation, all
four wheels may be decelerated in almost the same
phase, since all wheels are connected mechanically.
This tendency is noticeable particularly on roads with
low friction coefficient, and the ABS control is adversely
affected.
The G-sensor judges whether the friction coefficient of
road surface is low or high, and changes the EHCU's
operating system to ensure ABS and EBD control.

Normal and Anti-lock Braking
Under normal driving conditions, the Anti-lock Brake
System functions the same as a standard power
assisted brake system. However, with the detection of
wheel lock-up, a slight bump or kick-back will be felt in
the brake pedal. This pedal “bump” will be followed by a
series of short pedal pulsations which occurs in rapid
succession. The brake pedal pulsation will continue
until there is no longer a need for the anti-lock function
or until the vehicle is stopped. A slight ticking or
popping noise may be heard during brake applications
when the anti-lock features is being used.
When the anti-lock feature is being used, the brake
pedal may rise even as the brakes are being applied.
This is also normal. Maintaining a constant force on
the pedal will provide the shortest stopping distance.

5A-20 BRAKE CONTROL SYSTEM

Electronic Brake-force Distribution (EBD) System

ABS has the EBD function. EBD is a function which
controls braking force distribution of a front wheel and a
rear wheel, and makes brake fluid pressure of a rear
wheel the optimal. If the rate of a slip of a rear wheel
becomes large more than fixed compared with a front
wheel about the rate of a slip in order to perform
braking force distribution of a front wheel and a rear
wheel, the brake fluid pressure of a rear wheel will be
controlled. EBD enables it to always utilize the braking
power of a rear wheel for the maximum according to
the load change concerning the back axis by vehicles
loading states (No luggage, loading, etc.), deceleration,
etc. Brake fluid pressure control to a rear wheel is
performed by the EBD function which used the ABS
function without the mechanical proportioning valve.
C05L300016
Brake Pedal Travel
Vehicles equipped with the Anti-lock Brake System may
be stopped by applying normal force to the brake pedal.
Although there is no need to push the pedal beyond the
point where it stops or holds the vehicle, by applying
more force the pedal will continue to travel toward the
floor.
This extra brake pedal travel is normal.

Acronyms and Abbreviations
Several acronyms and abbreviations are commonly
used throughout this section:
ABS
Anti-lock Brake System
CKT
Circuit
DLC
Data Link Connector
EBD
Electronic Brake-force Distribution
EHCU
Electronic Hydraulic Control Unit
FL
Front Left
FR
Front Right
GEN
Generator
H/U
Hydraulic Unit
MV
Millivolts
RR
Rear
RPS
Revolution per Second
VDC
DC Volts
VAC
AC Volts
W/L
Warning Lamp
WSS
Wheel Speed Sensor

General Diagnosis
General Information
ABS troubles can be classified into two types, those
which can be detected by the ABS warning lamp and
those which can be detected as a vehicle abnormality
by the driver.
In either case, locate the fault in accordance with the
“BASIC DIAGNOSTIC FLOWCHART” and repair.
Please refer to Section 5C for the diagnosis of
mechanical troubles such as brake noise, brake judder
(brake pedal or vehicle vibration felt when braking),
uneven braking, and parking brake trouble.

ABS Service Precautions
Required Tools and Items:

Box Wrench
 Brake Fluid

Special Tool
Some diagnosis procedures in this section require the
installation of a special tool.

5-8840-0366-0 High Impedance Multimeter
When circuit measurements are requested, use a
circuit tester with high impedance.