2007 ISUZU KB P190 relay

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Page 149 of 6020

ISUZU KB P190 2007 Workshop Repair Manual HEATER AND AIR CONDITIONING 1-115
MAGNETIC CLUTCH DOES NOT RUN (C24SE)

Replace
YES
• Are the A/C thermo (X-15), heater & A/C (X-11)
and A/C compressor (X-14) relay OK?
• Are the No. SB

Page 150 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 1-116 HEATER AND AIR CONDITIONING

Open circuit between the No. EB-13
fuse and the engine room harness
connector terminal No.1 (X-14).
NO
YES
• Is there battery voltage between the engine

Page 151 of 6020

ISUZU KB P190 2007 Workshop Repair Manual HEATER AND AIR CONDITIONING 1-117

YES
• Disconnect the condenser fan relay connector condenser
fan.
YES
• Is there battery voltage between the engine room
harness connector terminal

Page 595 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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 Cir

Page 608 of 6020

ISUZU KB P190 2007 Workshop Repair Manual BRAKE CONTROL SYSTEM 5A-15

No. Connector face No. Connector face
H-6
White
Engine room ~ INST P-7
Battery (ALT)
H-7
White
Engine room ~ INST P-10
SilverEngine ground
H-9
White
Eng

Page 615 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 5A-22 BRAKE CONTROL SYSTEM
System Components
Electronic Hydraulic Control Unit (EHCU), four W heel
Speed Sensors, two W arning Lamps, and G sensor.

Electronic Hydraulic Control Unit (EHCU)

5A-22 BRAKE CONTROL SYSTEM
System Components
Electronic Hydraulic Control Unit (EHCU), four W heel
Speed Sensors, two W arning 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 and a
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: W hen failure occurs in ABS.
The power supply to solenoid Valve is cut.

ABS Warning Lamp

RTW 75ASH000101
Vehicles equipped with the Anti-lock Brake System
have an amber “ABS” warning lamp on 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 the
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
in the “ON” position.
If the “ABS” warning lamp stays “ON” after the ignition
switch is in 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
diagnostic 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 4W D 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
the 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 feature is being used.
W hen 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.

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ISUZU KB P190 2007

Page 622 of 6020

ISUZU KB P190 2007 Workshop Repair Manual BRAKE CONTROL SYSTEM 5A-29
8. According to indication of Tech 2 press the
"Confirm".

RTW 75ASH000901

9. According to indication of Tech 2 press the
"Confirm".

RTW 75ASH00

Page 625 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 5A-32 BRAKE CONTROL SYSTEM
Data List (Tech 2)
The data displayed by DATA LIST are as follows:
Strings Units Description
FL W heel Speed (Front Left) Km/h (MPH)
FR W heel Speed (Front Rig

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