2007 ISUZU KB P190 trans

REAR AXLE 4B-55
4. POWER NOT BEING TRANSMITTED TO THE WHEELS
(PROPELLER SHAFT OPERATION IS NORMAL)

Checkpoint Trouble Cause Countermeasure

Replace the rear axle shaftBroken rear axle shaft
NG
Replace the drive pinion and
the ring gear as a setDrive pinion and ring gearBroken drive pinion and/or ring
gear
Replace the differential gears
and/or the spiderDifferential cage gearsBroken differential cage gears
and/or spider
NG
NG
OK
OK
Rear axle shaft













BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

4C1-54 FRONT WHEEL DRIVE



Important Operations
1. Bolt
Before removal, shift transfer lever into “2H” position and set
free wheeling hub knob into “FREE” position.



6. Hub nut
W rench : 5-8840-2 117-0




7. Hub and disc assembly
Before disassembly, remove the disc brake caliper assembly
and hang it on the frame with wires.
Refer to Section “Brake” for disc brake caliper removal
procedure.



14. Clutch Assembly
W hile pushing follower knob, turn clutch assembly clockwise
and then remove clutch assembly from knob.





19. Retaining Spring
Remove retaining spring from clutch assembly by turning it
counterclockwise.


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

4C1-70 FRONT WHEEL DRIVE
PROPELLER SHAFT 1. NOISE

Checkpoint Trouble Cause Countermeasure

Spider bearingReplaceWorn or jammed
ReplaceDamaged or worn
NG
NG
OKYoke spline



2. VIBRATION

Shaft balanceAdjustUnbalance
ReplaceIncorrect
NG
NG
OKShaft runout
Transmission rear housing
bushing, transfer case
housing bushing
ReplaceWorn
NG
OK
Yoke splineReplaceJammed
NG
OK



BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

4C2-2 SHIFT ON THE FLY SYSTEM
SHIFT ON THE FLY SYSTEM
Outline of Shift on The Fly System
The shift on the fly system switches between 2 wheel
drive (2W D) and 4 wheel drive (4W D) electrically b
y
driver's pressing the 4W D switch (push button type) on
instrument panel.
This system controls below operations.
1. Shifting the transfer front output gear (Connecting to,
and disconnecting from, front propeller shaft b
y
motor actuator).
2. Retrial of shifting the transfer front output gear.
3. Connecting front wheels to, and disconnecting them from, the front axles by axle motor actuator.
4. Indicator on instrument panel.
5. 4W D out signal to other Electronic Hydraulic Control Unit.

System Diagrams
RUW 34BLF000201


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

5A-14 BRAKE CONTROL SYSTEM
Connector List
No. Connector face No. Connector face
B-23
White

Meter-A C-36
SilverEngine room - LH ; Ground
B-24
White

Meter-B C-44
WhiteStoplight switch
B-48
Black
G sensor C-53
OrangeABS sensor Front-RH
B-54
White
J/B I2 C-54
OrangeABS sensor Front-LH
B-56
White
J/B I4 C-67
Black
EHCU
B-58
Black
Data link connector C-107
WhiteJ/B E2
B-62
White
Ignition switch (IGSUB : G1) C-108
WhiteJ/B E1
B-63
White
Ignition switch (IGSUB : G2) C-109
SilverBody-LH ; ground
B-82
Silver
W eld splice 6 (Ground) C-111
BlackTransfer case control module
C-2
Silver
Engine room - RH ground F-4
Gray ABS sensor


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-21
EHCU Side
Pin No. Pin Function
Wire Color Typical Value Note
20 Stop Light Switch RED Open: 0V
Close: Battery Voltage Close Condition:
Step on the Brake
Pedal
21 G Sensor Signal YEL/BLK 2.0~3.0V
(MAX 4.0V, MIN 1.0V) 4W D Only
It checks in a flat place
(0G: 2.5V)
DTC C0276, C0285
22 ABS W arning Lamp YEL More than 10V -
23 Not Used - - -
24 Transfer (2-4W D Control Unit) GRY Pulse Signal
(High 4.5V, Low 1.5V) 4W D Only
DTC C0282
25 Serial ORN/W HT- Short to GND:
Flash out DTCs
26 Not Used - - -


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-83
Step Action
Value(s) Yes No
5 1. Ignition "OFF".
2. Connect 2-4W D control unit.
3. Disconnect EHCU.
4. Ignition "ON," engine "OFF."
5. Install the high impedance digital multimeter.
6. Check the transfer (2-4W D control unit) signal value. (Battery voltage is more than 10V.)
W as the value normal? Transfer 2W D
Mode: 8.3Hz (± 15%)
Transfer 4W D Mode: 4.2Hz (± 15%) Go to Step 7 Go to Step 6
6 Replace 2-4W D control unit.
Is the action complete?
- Go to Step 7 -
7 1. Ignition “ON”, engine “OFF”. 2. Select “Display DTCs” with the Tech 2. Note: Perform the various tests (actuator test, test
run, brake test, etc.) then observe the DTC with a
Tech 2.
Are any DTCs stored? - Go to Step 8 Verify repair
8 Replace EHCU.
Note: Check the EHCU type for specification, when
the EHCU is replaced.
(Specification ; 2W D model or 4W D model)
Is the action complete? - Verify repair -


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

5C-22 BRAKES
RTW 35CSH001001

•
••
•
Operation
1) Outline
W hen the LSPV (Load Sensing Proportioning Valve) detects a change in load weight, the load sensing spring
stretches.
Its reaction force is transmitted to the bottom of the load sensing valve to secure an optimum rear wheel cylinde
r
fluid pressure break point in proportion to the actual load
weight.
Besides, if the front brake system should fail, the device is designed to prevent the master cylinder fluid pressure from
decreasing and to apply it directly to the rear wheel cylinde
r
to obtain a sufficient braking performance.

RTW 35CSH001101

2) Bellow cutting point.
The Force (F) keeps the main piston (1) the rest position. The inlet pressure (A) and outlet pressure (B) are the same
as well as the inlet pressure (C) from front master cylinder.
The bypass piston (2) is kept on rest position by equilibrium
of the pressures (A) and (C) and the bypass spring load (3).

RTW 35CSH001201
3) Cutting point.
The cutting point is given by relation between force (F), that is the load applied by suspension of the vehicle and the
main piston area (1). The cutting point is achieved when the
force generated by hydraulic pressure is upper than the
force (F) given by the load suspension. The main piston (1)
moves from the rest position closing the valve. In this
moment the inlet pressure (A) is upper than the outlet
pressure (B). The bypass piston (2) continues on the rest
position by equilibrium of (A) and (C) pressure.


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007