fuse box ISUZU TROOPER 1998 Service Repair Manual

4B1±12
DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Parts Location (LHD / Diesel Engine Model)
D08RW852
Legend
(1) I±12
(2) I±9
(3) H±7, H±8, H±24, H±25
(4) Fuse Box
(5) C±16
(6) C±94
(7) H±4, H±5(8) P±17
(9) P±18
(10) P±19
(11) H±60
(12) Relay & Fuse Box
(13) H±12, H±16
(14) E±21
(15) E±45

4B1±13 DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Parts Location (LHD / Gasoline Engine Model)
D08RW854
Legend
(1) I±12
(2) I±9
(3) H±7, H±8, H±24, H±25
(4) Fuse Box
(5) C±16
(6) C±94
(7) H±5
(8) M±11, M±12(9) M±22
(10) M±23
(11) M±24
(12) H±10
(13) M±26
(14) Relay & Fuse Box
(15) H±12, H±16
(16) E±30

4B1±14
DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Parts Location (RHD / Diesel Engine Model)
D08RW831
Legend
(1) I±9
(2) I±12
(3) E±45
(4) E±21
(5) H±7, H±9
(6) C±16
(7) C±94(8) H±4, H±5
(9) P±17
(10) P±18
(11) P±19
(12) H±60
(13) Relay & Fuse Box
(14) H±15, H±16, H±25, H±26, H±27
(15) Fuse Box

4B1±15 DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Parts Location (RHD / Gasoline Engine Model)
D08RW853
Legend
(1) I±9
(2) I±12
(3) H±7, H±9
(4) C±16
(5) H±5
(6) C±94
(7) M±26
(8) M±11, M±12(9) M±22
(10) M±23
(11) M±24
(12) H±10
(13) H±12
(14) Relay & Fuse Box
(15) E±30
(16) H±15, H±16, H±25, H±26, H±27
(17) Fuse Box

4B2±17 DRIVE LINE CONTROL SYSTEM (TOD)
Parts Location
D08RW621
Legend
(1) I±9
(2) B±13 or B±14
(3) H±12
(4) I±12
(5) A±3
(6) H±7, H±8
(7) H±32
(8) C±16
(9) H±5, H±6
(10) C±63
(11) H±49(12) M±22
(13) M±23
(14) M±24
(15) H±10
(16) E±5
(17) E±29
(18) H±42
(19) E±30
(20) Battery
(21) H±13, H±15, H±26
(22) Fuse Box
(23) B±67, B±68

5A±5 BRAKE CONTROL SYSTEM
FR
Front Right
GEN
Generator
MV
Millivolts
RL
Rear Left
RR
Rear RightRPS
Revolution per Second
VDC
Volts DC
VA C
Volts AC
W/L
Warning Light
WSS
Wheel Speed Sensor
General Diagnosis
General Information
ABS malfunction can be classified into two types, those
which can be detected by the ABS warning light and those
which can be detected as a vehicle abnormality by the
driver.
In either case, locate the fault in accordance with the
ªBASIC DIAGNOSTIC FLOWCHARTº 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.
J-39200 High Impedance Multimeter
When circuit measurements are requested, use a circuit
tester with high impedance.
Computer System Service Precautions
The Anti-lock Brake System interfaces directly with the
Electronic Hydraulic Control Unit (EHCU) which is a
control computer that is similar in some regards to the
Powertrain Control Module. These modules are designed
to withstand normal current draws associated with
vehicle operation. However, care must be taken to avoid
overloading any of the EHCU circuits. In testing for opens
or shorts, do not ground or apply voltage to any of the
circuits unless instructed to do so by the appropriate
diagnostic procedure. These circuits should only be
tested with a high impedance multimeter (J-39200) or
special tools as described in this section. Power should
never be removed or applied to any control module with
the ignition in the ªONº position.
Before removing or connecting battery cables, fuses or
connectors, always turn the ignition switch to the ªOFFº
position.
General Service Precautions
The following are general precautions which should be
observed when servicing and diagnosing the Anti-lock
Brake System and/or other vehicle systems. Failure toobserve these precautions may result in Anti-lock Brake
System damage.

If welding work is to be performed on the vehicle using
an electric arc welder, the EHCU and valve block
connectors should be disconnected before the
welding operation begins.

The EHCU and valve block connectors should never
be connected or disconnected with the ignition ªONº .

EHCU of the Anti-lock Brake System are not
separately serviceable and must be replaced as
assemblies. Do not disassemble any component
which is designated as non-serviceable in this
Section.

If only rear wheels are rotated using jacks or drum
tester, the system will diagnose a speed sensor
malfunction and the ªABSº warning light will
illuminate. But actually no trouble exists. After
inspection stop the engine once and re-start it, then
make sure that the ªABSº warning light does not
illuminate.
If the battery has been discharged
The engine may stall if the battery has been completely
discharged and the engine is started via jumper cables.
This is because the Anti-lock Brake System (ABS)
requires a large quantity of electricity. In this case, wait
until the battery is recharged, or set the ABS to a
non-operative state by removing the fuse for the ABS
(40A). After the battery has been recharged, stop the
engine and install the ABS fuse. Start the engine again,
and confirm that the ABS warning light does not light.
Note on Intermittents
As with virtually any electronic system, it is difficult to
identify an intermittent failure. In such a case duplicating
the system malfunction during a test drive or a good
description of vehicle behavior from the customer may be
helpful in locating a ªmost likelyº failed component or
circuit. The symptom diagnosis chart may also be useful
in isolating the failure. Most intermittent problems are
caused by faulty electrical connections or wiring. When
an intermittent failure is encountered, check suspect
circuits for:

Suspected harness damage.

Poor mating of connector halves or terminals not fully
seated in the connector body (backed out).

Improperly formed or damaged terminals.

5A±20
BRAKE CONTROL SYSTEM
Part Location (LHD model)
D08RW808
Legend
(1) F±2
(2) F±3
(3) H±33
(4) H±7, H±8, H±25
(5) H±46
(6) C±16
(7) C±63
(8) Fuse Box
(9) B±13 or B±14
(10) C±13
(11) H±5
(12) H±10, H±11(13) E±30
(14) C±41
(15) H±42
(16) C±85
(17) C±4 (EHCU)
(18) Relay & Fuse Box
(19) C±39
(20) H±12, H±13, H±15, H±16
(21) E±47, E±48, M±1
(22) E±42, E±43, M±8
(23) B±25
(24) I±10
(25) I±9

5A±34
BRAKE CONTROL SYSTEM
Part Location (RHD model)
D08RW623
Legend
(1) F±2
(2) F±3
(3) H±33
(4) H±7
(5) H±46
(6) C±16
(7) E±42, E±43, M±8
(8) E±47, E±48, M±1
(9) B±13 or B±14
(10) C±13
(11) H±4, H±5, H±6
(12) H±10, H±11
(13) E±4 (4JX1)(14) E±30 (4GJ2, 6VD1/6VE1)
(15) Fuse Box
(16) H±42
(17) C±41
(18) C±85
(19) C±4 (EHCU)
(20) Relay & Fuse Box
(21) C±39
(22) H±13, H±15, H±16, H±26, H±27
(23) I±10
(24) I±9
(25) H±12
(26) C±63
(27) B±25

5C – 10 POWER ASSISTED BRAKE SYSTEM
BLEEDING BRAKE HYDRAULIC SYSTEM
A bleeding operation is necessary to remove air from
the hydraulic brake system whenever air is introduced
into the hydraulic system. It may be necessary to
bleed the hydraulic system at all four brakes if air has
been introduced through a low fluid level or by
disconnecting brake pipes at the master cylinder. If a
brake pipe is disconneted at one wheel, only that
wheel cylinder/caliper needs to be bled. If pipes are
disconnected at any fitting located between master
cylinder and brakes, then the brake system served by
the disconnected pipe must be bled.
1. For 4-wheel Antilock Brake System (ABS)
equipped vehicle, be sure to remove the ABS main
fuse 40A located at the relay and fuse box before
bleeding air. If you attempt to bleed air without
removing the main fuse, air cannot be let out
thoroughly, and this may cause damage to the
hydraulic unit. After bleeding air, be sure to
replace the ABS main fuse back to its original
position.
2. Set the parking brake completely, then start the
engine.
NOTE:
The vacuum booster will be damaged if the bleeding
operation is performed with the engine off.
3. Remove the master cylinder reservoir cap.
4. Fill the master cylinder reservoir with brake fluid.
Keep the reservoir at least half full during the air
bleeding operation.
5. Always use new brake fluid for replenishment.
6. In replenishing brake fluid, take care that air
bubbles do not enter the brake fluid.
•When the master cylinder is replaced or
overhauled, first bleed the air from the master
cylinder, then from each wheel cylinder and
caliper following the procedures described
below.
Bleeding the Master Cylinder
7. Disconnect the rear wheel brake pipe 1from the
master cylinder. Check the fluid level and
replenish as necessary. If replenished, leave the
system for at least one minute.
8. Depress the brake pedal slowly once and hold it
depressed.
9. Completely seal the delivery port of the master
cylinder where the pipe was disconnected with
your finger, then release the brake pedal slowly.
10. Release your finger from the delivery port when
the brake pedal returns completely.
11. Repeat steps 7 through 9 until the brake fluid
comes out of the delivery port during step 7.
NOTE:
Do not allow the fluid level in the reservoir to go
below the half-way mark.
21

6A±5
ENGINE MECHANICAL
4. Engine Lacks Compression
Condition
Possible causeCorrection
Engine lacks compressionSpark plug loosely fitted or spark
plug gasket defectiveTighten to specified torque or replace
gasket
Valve timing incorrectAdjust
Cylinder head gasket defectiveReplace gasket
Valve incorrectly seatedLap valve
Valve stem seizedReplace valve and valve guide
Valve spring weakened or brokenReplace
Cylinder or piston rings wornOverhaul engine
Piston ring seizedOverhaul engine.
Engine Compression Test Procedure
1. Start and run the engine until the engine reaches
normal operating temperature.
2. Turn the engine off.
3. Remove all the spark plugs.
4. Remove ignition coil fuse (15A) and disable the
ignition system.
5. Remove the fuel pump relay from the relay and fuse
box.
6. Engage the starter and check that the cranking speed
is approximately 300 rpm.7. Install cylinder compression gauge into spark plug
hole.
8. With the throttle valve opened fully, keep the starter
engaged until the compression gage needle reaches
the maximum level. Note the reading.
9. Repeat the test with each cylinder.
If the compression pressure obtained falls below the
limit, engine overhaul is necessary.
Limit; 1000 kPa (145 psi)