2004 ISUZU TF SERIES ECU

5C-22 BRAKES

RTW35CSH001001






Operation
1) Outline
When 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.

RTW35CSH001101

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).

RTW35CSH001201

3) Cutting point.
The cutting point is given by relation between force (F), tha
t
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 outle
t
pressure (B). The bypass piston (2) continues on the res
t
position by equilibrium of (A) and (C) pressure.

5C-24 BRAKES

RTW35CSH000201
3) Rear wheel cylinder fluid pressure measurement
Step on the brake pedal until the fluid pressure of the
front wheel cylinder gets to 9.8Mpa (100kg/cm
2), and
check the rear wheel cylinder fluid pressure. (Read the
value of the front wheel cylinder fluid pressure 2
seconds after the measurement. When measuring the
L.S.V fluid pressure, keep the brake pedal pressed
down without stepping it down twice or releasing it.)
Rear Wheel Cylinder Fluid Pressure MPa (kg/cm
2)

2WD 6.77
0.83 (69.0
8.5)
2WD (With High Ride
Suspension), 4WD 6.77

0.83 (69.0

8.5)

RTW35CSH000401
2. Oil Pressure Adjustment
1) LSPV spring length adjustment
Loosen the adjust nut of the LSPV spring joint, and
adjust the length of the LSPV spring.
When the oil pressure is insufficient, turn the adjust nu
t
clockwise to extend the span “A”. When the oil pressure
is too high, turn the adjust nut counterclockwise to
reduce the span “A”.


2) After adjustment, tighten the lock nut securely.
Lock Nut Torque N
m (kg
m/lb in)
11-20 (1.1-2.0/95-174)

CAB 10-3



Important Operations - Removal
3. Room Mirror
Remove the screw and pull the room mirror to upper side.


8. Windshield Glass
Remove the windshield glass, carefully following the steps
listed below:
1) Use a knife to cut through part of the adhesive caulking
material.
2) Secure one end of a piece of steel piano wire (0.02 inches
in diameter) to a piece of wood that can serve as a handle.
3) Use a pair of needle nose pliers to insert the other end o
f
the piano wire through the adhesive caulking material at the
edge of the windshield glass.
4) Secure the other end of the piano wire to another piece o
f
wood.




5) With the aid of an assistant, carefully move the piano wire
with a sawing motion to cut through the adhesive caulking
material around the entire circumference of the windshield
glass.
6) Lift the windshield from the body.
7) Clean any remaining adhesive caulking material from the
area of the body which holds the windshield.
8) Use a soft rag and unleaded gasoline to wipe off an
y
adhesive remaining on the windshield glass.

10-8 CAB

Important Operation - Removal
3. Rear Window Glass
Remove the glass, carefully following the steps listed below :
1) Use a knife to cut through part of the adhesive caulking
material.
2) Secure one end of a piece of steel piano wire (0.02 inches
in diameter) to a piece of wood that can serve as a handle.
3) Use a pair of needle nose pliers to insert the other end o
f
the piano wire through the adhesive caulking material at the
edge of the rear window glass.
4) Secure the other end of the piano wire to another piece o
f
wood.




5) With the aid of an assistant, carefully move the piano wire
with a sawing motion to cut through the adhesive caulking
material around the entire circumference of the rear windo
w
glass.
6) Lift the rear window glass from the body.
7) Clean any remaining adhesive caulking material from the
area of the body which holds the rear window glass.
8) Use a soft rag and unleaded gasoline to wipe off an
y
adhesive remaining on the rear window glass.


Important Operation - Installation
3. Rear Window Glass
1) Clean the rear window glass bonding surface.
2) Use a soft rag and unleaded gasoline to wipe off an
y
adhesive remaining on the body.
3) Install the fastener tape to body panel flange.



4) Apply primer 1 sunster #435-40 or equivalent to the rear
window glass side bonding surface.
The primer should extend 23 mm (0.9 in.) form end of the
glass.

ELECTRICAL-BODY AND CHASSIS 8A-9

SPLICING WIRE
Open the Harness
If the harness is taped, remove the tape.
To avoid wire insulation damage, use a sewing "seam ripper"
(available from sewing supply stores) to cut open the harness.
If the harness has a black plastic conduit, simply pull out the
desired wire.
Cut the wire
Begin by cutting as little wire off the harness as possible.
You may need the extra length of wire later if you decide to cut
more wire off to change the location of a splice.
You may have to adjust splice locations to make certain that
each splice is at least 1-1/2" (40 mm) away from other splices,
harness branches, or connectors.
Strip the insulation
When replacing a wire, use a wire of the same size as the
original wire.
Check the stripped wire for nicks or cut strands.
If the wire is damaged, repeat the procedure on a new section
of wire.
The two stripped wire ends should be equal in length.



Crimp the Wires
Select the proper clip to secure the splice.
To determine the proper clip size for the wire being spliced,
follow the directions included with your clips.
Select the correct anvil on the crimper.
(On most crimpers your choice is limited to either a small or
large anvil.)
Overlap the two stripped wire ends and hold them between
your thumb and forefinger.
Then, enter the splice clip under the stripped wires and hold it
in place.




Open the crimping tool to its full width and rest one handle
on a firm flat surface.

Center the back of the splice clip on the proper anvil and
close the crimping tool to the point where the back of the
splice clip touches the wings of the clip.

Make sure that the clip and wires are still in the correc
t
position. Then, apply pressure until the crimping tool closes.



Before crimping the ends of the clip, be sure that:

The wires extend beyond the clip in each direction.

No strands of wire are cut loose.

No insulation is caught under the clip.
Crimp the splice again, once on each end.
Do not let the crimping tool extend beyond the edge of the clip
or you may damage or nick the wires.

8A-12 ELECTRICAL-BODY AND CHASSIS
ABBREVIATIONS
Abbreviation Meaning of abbreviation Abbreviation Meaning of abbreviation
A Ampere (S) LH Left hand
ABS Anti-lock brake system LWB Long wheel base
ASM Assembly MPI Multipart fuel injection
AC Alternating current M/T Manual transmission
A/C Air conditioner QOS Quick On Start system
ACC Accessories RH Right hand
CARB Carburetor RR Rear
C/B Circuit breaker RWAL Rear wheel anti-lock brake system
CSD Cold start device SRS Supplemental restraint system
DIS Direct ignition system ST Start
EBCM Electronic brake control module STD Standard
ECGI Electronic control gasoline injection SW Switch
ECM Engine control module SWB Short wheel base
ECU Electronic control unit TCM Transmission control module
EFE Early fuel evaporation V Volt
42 Two-wheel drive VSV Vacuum switching valve
44 Four-wheel drive W Watt (S)
FL Fusible link WOT Wide open throttle
FRT Front W/ With
H/L Headlight W/O Without
IC Integrated circuit
IG Ignition
kW Kilowatt

ELECTRICAL-BODY AND CHASSIS 8A-105
REMOVAL AND INSTALLATION


ECM (ENGINE CONTROL MODULE):
C24SE

Removal
1. Lift both the ECM harness connector locking levers and
remove the two harness connectors form the ECM.
2. Remove the four socket head screws securing the ECM to
the mounting bracket.
3. Remove the ECM from the engine compartment
.


4. Pull out the ECM.
5. Disconnect both red and tan connectors.
Refer to the Section 6E-ENGINE of this Manual.
IMPORTANT: The replacement ECM must be programmed.
“SPS (Service Programming System) and immobiliser
programming (if equipped) is/are necessary”





Installation
Follow the removal procedure in the reverse order to install the
ECM.
Pay close attention to the important points mentioned in the
following paragraphs.



Connector
Be absolutely sure that ECM is securely connected.
This will prevent a poor contact and open circuit.

8A-106 ELECTRICAL-BODY AND CHASSIS
REMOVAL AND INSTALLATION


ECM (ENGINE CONTROL MODULE):
6VE1
Removal
1. Pull both the red ECM harness connector locks toward the
front of the vehicle, and remove the two harness connectors
form the ECM.
2. Remove the four hex-head screws securing the ECM to the
common chamber.
3. Remove the ECM from the engine compartment.


4. Pull out the ECM.
5. Disconnect both red and tan connectors.
Refer to the Section 6E-ENGINE of this Manual.
IMPORTANT: The replacement ECM must be programmed.
“SPS (Service Programming System) and immobiliser
programming (if equipped) is/are necessary”





Installation
Follow the removal procedure in the reverse order to install the
ECM.
Pay close attention to the important points mentioned in the
following paragraphs.



Connector
Be absolutely sure that ECM is securely connected.
This will prevent a poor contact and open circuit.