charging ISUZU TROOPER 1998 Service Workshop Manual

6E±341 ENGINE DRIVEABILITY AND EMISSIONS
this is done, if the problem still exists, it may be diagnosed
in the normal manner.
Electrostatic Discharge Damage
Electronic components used in the PCM are often
designed to carry very low voltage. Electronic
components are susceptible to damage caused by
electrostatic discharge. Less than 100 volts of static
electricity can cause damage to some electronic
components. By comparison, it takes as much as 4000
volts for a person to feel even the zap of a static
discharge.
TS23793
There are several ways for a person to become statically
charged. The most common methods of charging are by
friction and induction.

An example of charging by friction is a person sliding
across a vehicle seat.

Charge by induction occurs when a person with well
insulated shoes stands near a highly charged object
and momentary touches ground. Charges of the
same polarity are drained off leaving the person
highly charged with the opposite polarity. Static
charges can cause damage, therefore it is important
to use care when handling and testing electronic
components.
NOTE: To p r e ve n t p ossible electrostatic discharge
damage, follow these guidelines:

Do not touch the PCM connector pins or soldered
components on the PCM circuit board.

Do not touch the knock sensor module component
leads.

Do not open the replacement part package until the
part is ready to be installed.

Before removing the part from the package, ground
the package to a known good ground on the vehicle.

If the part has been handled while sliding across the
seat, while sitting down from a standing position, or
while walking a distance, touch a known good ground
before installing the part.
Upshift Lamp
Refer to Manual Transmission.
General Description (Air Induction)
Air Induction System
The air induction system filters contaminants from the
outside air, and directs the progress of the air as it is
drawn into the engine. A remote-mounted air cleaner
prevents dirt and debris in the air from entering the
engine. The air duct assembly routes filtered air to the
throttle body. Air enters the engine by to following steps:
1. Through the throttle body.
2. Into the common chamber.
3. Through the cylinder head intake ports.
4. Into the cylinders.
055RV010
General Description (Fuel Metering)
Acceleration Mode
The PCM provides extra fuel when it detects a rapid
increase in the throttle position and the air flow.
Accelerator Controls
The accelerator control system is a cable-type system
with specific linkage adjustments.
Refer to
Cable Adjustment.
Battery Voltage Correction Mode
When battery voltage is low, the PCM will compensate for
the weak spark by increasing the following:

The amount of fuel delivered.

The idle RPM.

Ignition dwell time.
CMP Signal
The PCM uses this signal to determine the position of the
number 1 piston during its power stroke, allowing the

SERVICE INFORMATION 00 Ð 15
ENGINE ELECTRICAL
Check if the battery is normal, then perform the following diagnosis.
STARTER DOES NOT RUN
CHECK BATTERY
CHARGING FAILURE OR LIFE
CHECK BATTERY
BATTERY IS NORMAL
CHECK TERMINAL CONNECTION
CONNECTION FAILURE
CLEAN BATTERY TERMINALS, AND RECONNECT
TERMINAL CONNECTION IS NORMAL
CHECK STARTER OR STARTER SWITCH
FAILURE
REPAIR OR REPLACE
TURN ON HEAD LAMP AND STARTER SWITCH
HEAD LAMP DOES NOT COME ON
OR IT IS EXTREMELY DARK
a) LACK OF BATTERY CHARGING
b) SHORT-CIRCUIT IN STARTER COIL
c) FAULTY STARTER PARTS
HEAD LAMP ILLUMINATES
a) DISCONNECTED STARTER CIRCUIT
b) DISCONNECTED STARTER COIL
c) FAULTY STARTER SWITCH

00 Ð 22 SERVICE INFORMATION
Charging System
Model (HITACHI)
Rated voltage
Rated outputLR150 – 446
12
50LR180 – 501B
12
80
Rotating direction
(As viewed from pulled)
Pulley effective diameter
Weight (with pump)
Clockwise Clockwise
80 (3.15)
65(6.6 /14.6)
80 (3.15)
76(7.8 /17.2) V
A
mm(in)
N(Kg/lb)

ENGINE ELECTRICAL 6D1 Ð 1
SECTION 6D
ENGINE ELECTRICAL
CONTENTS
Battery................................................................................................................................... Section 6D1
Starting System ................................................................................................................... Section 6D2
Charging System.................................................................................................................. Section 6D3
QOS-IIIPreheating System ................................................................................................. Section 6D6
SECTION 6D1
BATTERY
CONTENTS
General Description ......................................... 6D1Ð1
Diagnosis .......................................................... 6D1Ð1
On-Vehicle Service........................................... 6D1Ð3
Battery Charging .......................................... 6D1Ð3Jump Starting .............................................. 6D1Ð3
Removal and Installation of Battery .......... 6D1Ð4
GENERAL DESCRIPTION
There are six battery fluid caps at the top of the
battery. These are covered by a paper label.
The battery is completely sealed except for the six
small vent holes at the side. These vent holes per-
mit the escape of small amounts of gas generated
by the battery.
This type of battery has the following advantages
over conventional batteries:1. There is no need to add water during the entire
service life of the battery.
2. The battery protects itself against overcharging.
The battery will refuse to accept an excessive
charge.
(A conventional battery will accept an excessive
charge, resulting in gassing and loss of battery
fluid.)
3. The battery is much less vulnerable to self-
discharge than a conventional type battery.
DIAGNOSIS
1. VISUAL INSPECTION
Inspect the battery for obvious physical damage,
such as a cracked or broken case, which would
permit electrolyte loss.
Replace the battery if obvious physical damage is
discovered during inspection.
Check for any other physical damage and correct it
as necessary. If not, proceed to Step 2.
2. HYDROMETER CHECK
There is a built-in hydrometer (Charge test indica-
tor) at the top of the battery. It is designed to be
used during diagnostic procedures.Before trying to read the hydrometer, carefully
clean the upper battery surface.
If your work area is poorly lit, additional light may
be necessary to read the hydrometer.
a. BLUE RING OR DOT VISIBLE Ð Go to Step
4.
b. BLUE RING OR DOT NOT VISIBLE Ð Go to
Step 3.

6D1 Ð 2 ENGINE ELECTRICAL
3. FLUID LEVEL CHECK
The fluid level should be between the upper level
line and lower level line on side of the battery.
a. CORRECT FLUID LEVEL Ð Charge the bat-
tery.
b. BELOW LOWER LEVEL Ð Replace battery.
4. VOLTAGE CHECK
(1) Put voltmeter test leads to battery terminals.
a. VOLTAGE IS 12.4V OR ABOVE Ð Go to
Step 5.
b. VOLTAGE IS UNDER 12.4V Ð Go to proce-
dure (2) below.
(2) Determine fast charge amperage from specifi-
cation. (See Main Data and Specifications in
this section).
Fast charge battery for 30 minutes at amperage
rate no higher than specified value.
Take voltage and amperage readings after
charge.
a. VOLTAGE IS ABOVE 16V AT BELOW 1/3 OF
AMPERAGE RATE Ð Replace battery.
b. VOLTAGE IS ABOVE 16V AT ABOVE 1/3 OF
AMPERAGE RATE Ð Drop charging voltage
to 15V and charge for 10 - 15 hours.
Then go to Step 5.
c. VOLTAGE IS BETWEEN 12V AND 16V Ð
Continue charging at the same rate for an
additional 3-1/2 hours. Then go to Step 5.
d. VOLTAGE IS BELOW 12V Ð Replace battery.
5. LOAD TEST
(1) Connect a voltmeter and a battery load tester
across the battery terminals.
(2) Apply 300 ampere load for 15 seconds to
remove surface charge from the battery.
Remove load.
(3) Wait 15 seconds to let battery recover. Then
apply specified load from specifications (See
Main Data and Specifications in this section).
Read voltage after 15 seconds, then remove
load.
a. VOLTAGE DOES NOT DROP BELOW THE
MINIMUM LISTED IS FOLLOWING TABLE Ð
The battery is good and should be returned
to service.
b. VOLTAGE IS LESS THAN MINIMUM
LISTED Ð Replace battery.
ESTIMATED
MINIMUM
TEMPERATURE
VOLTAGE
¡F ¡C
70 21 9.6
60 16 9.5
50 10 9.4
40 4 9.3
30 Ð1 9.1
20 Ð7 8.9
10 Ð12 8.7
0 Ð18 8.5
The battery temperature must be estimated by feel and by the
temperature the battery has been exposed to for the
preceding few hours.

ENGINE ELECTRICAL 6D1 Ð 3
BATTERY CHARGING
Observe the following safety precautions when
charging the battery:
1. Never attempt to charge the battery when the
fluid level is below the lower level line on the
side of the battery. In this case, the battery
must be replaced.
2. Pay close attention to the battery during the
charging procedure.
Battery charging should be discontinued or the
rate of charge reduced if the battery feels hot to
the touch.
Battery charging should be discontinued or the
rate of charge reduced if the battery begins to
gas or spew electrolyte from the vent holes.
3. In order to more easily view the hydrometer
blue dot or ring, it may be necessary to jiggle or
tilt the battery.
4. Battery temperature can have a great effect on
battery charging capacity.
5. The sealed battery used on this vehicle may be
either quick-charged or slow-charged in the
same manner as other batteries.
Whichever method you decide to use, be sure
that you completely charge the battery. Never
partially charge the battery.
JUMP STARTING
JUMP STARTING WITH AN AUXILIARY
(BOOSTER) BATTERY
CAUTION:
Never push or tow the vehicle in an attempt to
start it. Serious damage to the emission system
as well as other vehicle parts will result.
Treat both the discharged battery and the
booster battery with great care when using
jumper cables. Carefully follow the jump
starting procedure, being careful at all times to
avoid sparking.
WARNING:
Failure to carefully follow the jump starting
procedure could result in the following:
1. Serious personal injury, particulaly to
your eyes.
2. Property damage from a battery explo-
sion, battery acid, or an electrical fire.
3. Damage to the electronic components of
one or both vehicles particularly. Never expose the battery to an open flame or elec-
trical spark. Gas generated by the battery may catch
fire or explode.
Remove any rings, watches, or other jewelry before
working around the battery. Protect your eyes by
wearing an approved set of goggles.
Never allow battery fluid to come in contact with
your eyes or skin.
Never allow battery fluid to come in contact with
fabrics or painted surfaces.
Battery fluid is a highly corrosive acid.
Should battery fluid come in contact with your
eyes, skin, fabric, or a painted surface, immediately
and thoroughly rinse the affected area with clean
tap water.
Never allow metal tools or jumper cables to come
in contact with the positive battery terminal, or any
other metal surface of the vehicle. This will protect
against a short circuit.
Always keep batteries out of the reach of young
children.
JUMP STARTING PROCEDURE
1. Set the vehicle parking brake.
If the vehicle is equipped with an automatic
transmission, place the selector lever in the
ÒPARKÓ position.
If the vehicle is equipped with a manual trans-
mission place the shift lever in the ÒNEUTRALÓ
position.
Turn ÒOFFÓ the ignition.
Turn ÒOFFÓ all lights and any other accessory
requiring electrical power.
2. Look at the built-in hydrometer.
If the indication area of the built-in hydrometer
is completely clear, do not try to jump start.
3. Attach the end of one jumper cable to the posi-
tive terminal of the booster battery.
Attach the other end of the same cable to the
positive terminal of the discharged battery.
Do not allow the vehicles to touch each other.
This will cause a ground connection, effectively
neutralizing the charging procedure.
Be sure that the booster battery has a 12 volt
rating.
4. Attach one end of the remaining cable to the
negative terminal of the booster battery.
Attach the other end of the same cable to a
solid engine ground (such as the A/C com-
pressor bracket or the generator mounting
bracket) of the vehicle with the discharged bat-
tery.
This ground connection must be at least 450
mm (18 in) from the battery of the vehicle
whose battery is being charged.
ON-VEHICLE SERVICE

CHARGING SYSTEM 6D3 Ð 1
SECTION 6D3
CHARGING SYSTEM
CONTENTS
PAGE
General Description ........................................................................................................ 6D3-1
Diagnosis ......................................................................................................................... 6D3-4
Unit Repair ....................................................................................................................... 6D3-5
GENERAL DESCRIPTION
The generator does not require particular
maintenance such as voltage adjustment. The
rectifier connected to the stator coil has nine diodes
to transform A.C. voltage into D.C. voltage. This
D.C. voltage is connected to the output terminal of
generator. The charging system is the IC integral regulator
charging system and its main components are
connected as shown in Figure.
The regulator is a solid state type and it is mounted
along with the brush holder assembly inside the
generator installed on the rear end cover.

6D3 Ð 2 CHARGING SYSTEM

CHARGING SYSTEM 6D3 Ð 3

6D3 Ð 4 CHARGING SYSTEM
DIAGNOSIS
GENERAL ON-VEHICLE INSPECTION
The operating condition of charging system is indicated
by the charge warning lamp. The warning lamp comes on
when the starter switch is turned to ÒONÓ position. The
charging system operates normally if the lamp goes off
when the engine starts. If the warning lamp shows
abnormality or if undercharged or overcharged battery
condition is suspected, perform diagnosis by checking the
charging system as follows:
1. Check visually the belt and wiring connector.
2. With the engine in stop status, turn the starter switch
to ÒONÓ position and observe the warning lamp.
·If lamp does not come on:
Disconnect wiring connector from generator, an
ground the terminal ÒLÓ on connector side.
·If lamp comes on:
Repair or replace the generator.