Isuzu KB P190. Manual — part 911

Battery

Page 6D1-3–4

•

Clarify a procedure,

•

Present additional information for accomplishing a procedure,

•

Give insight into the reasons for performing a procedure in the recommended manner, and / or

Present information that gives the technician the benefit of past experience in accomplishing a procedure with greater
ease.

1.2

Battery Terminals and Cables

The cables attached to the battery posts provide power and ground connections for the vehicle electrical system. These
battery cables attach to the battery posts via nut-tightened terminals. The battery is held in position by a hold-down
bracket and bolts. Refer to Figure 6D1-3 – 1.

Figure 6D1-3 – 1

Legend

1

Negative Battery Post

2

Negative Battery Terminal

3

Negative Battery Terminal Bolt

4

Negative Battery Terminal Nut

5

Positive Connection Cover

6

Battery Positive Cable Nut

7

Battery Positive Cable Assembly

8

Battery Fuse Box Nut

9

Battery Fuse Box Washer

10

Main Fuse Box Supply

11

Positive Battery Terminal

12

Positive Battery Terminal Nut

13

Positive Battery Terminal Bolt

14

Positive Battery Post

15

Battery Positive Cable Assembly

16

Battery Positive Cable Assembly

17

Battery Hold Down Bracket

18

Battery Hold Down Bolts

19

Battery Hold Down Bolt

1.3 Battery

Ratings

There are two battery ratings to consider when replacing a battery, reserve capacity (RC) and cold cranking amps (CCA).
Ensure the replacement battery meets or exceeds these rating specifications.

Reserve Capacity

The RC of a battery is the amount of time (measured in minutes) the vehicle will travel at night with minimum electrical
load and no generator input.

Battery

Page 6D1-3–5

This time is measured as the time taken for the battery voltage to reduce to 10.5 V from the following initial conditions:

•

a fully charged battery at 25

°C, and

•

discharged at a constant current of 25 A.

Cold Cranking Amps

The CCA rating indicates the ability of the battery to maintain enough voltage for ignition requirements while supplying
engine cranking current for long enough to start the engine under severely cold conditions.

The rating is the minimum amperage maintained when the engine is cranked for 30 seconds. The battery must maintain
at least 7.2 V at 18

°C.

Ratings

A specification label on the top of the battery displays the original equipment part number.

All vehicles are fitted with a low maintenance, 85 minute RC and 430 CCA battery.

Battery

Page 6D1-3–6

2 Safety

Precautions

• Battery fluid contains sulphuric acid,

which can cause serious injury. Do not
allow liquid from the battery to contact
eyes or skin. If contact occurs, flush the
area immediately with running water and
contact a physician.

• Lead acid batteries produce explosive

gases. Keep sparks, flames and lighted
cigarettes away from the battery,
especially when the battery is being
charged. Failure to follow this warning
could result in a battery explosion.

• Metal objects that touch a battery terminal

can produce sparks that can cause
serious burns. When working near a
battery, take extra care with metal objects
including tools and items of jewellery,
especially rings and metal watchbands.

Do not allow liquid from the battery to contact
clothing or painted surfaces. If contact occurs,
flush the area immediately with running water.

When working with or near the battery, always:

•

Wear safety glasses and work gloves.

•

Remove items of jewellery such as rings and metal watchbands.

•

Ensure the ignition is switched off when connecting or disconnecting battery cables, battery charging equipment or
battery jumper cables. Failing to do so can damage the vehicle electronic components.

•

Disconnect the negative battery cable before disconnecting the positive cable from the battery. Inversely, connect
the positive battery cable to the battery before connecting the negative cable. This reduces the possibility of
shorting the battery to ground while working near the positive connections.

Battery

Page 6D1-3–7

3 Diagnosis

3.1 Diagnostic

Procedures

Introduction

This test is used to aid in diagnosing faults with the vehicle where the battery seems to be at fault.

With the increased use of electronic sensors and computer control, the battery is much more than just a component used
to start a car. Low battery voltage can:

•

affect the operation of the vehicle control modules and cause driveability problems, and

•

cause the control modules to set diagnostic trouble codes (DTCs).

For example if a control module senses low battery voltage, it may increase fuel injector timing to increase engine rpm to
increase the generator output.

Therefore consider the state of charge of the battery any time a customer complains of a driveability related problem.

Test Description

The following numbers refer to the step numbers in the diagnostic table:

1

Checks the operator understands the safety precautions for working with batteries.

2

Checks if the vehicle is fitted with a battery of the correct specification.

3

Checks if the battery appears serviceable by performing the battery inspection procedure.

4

Checks if the battery loses charge over an extended period. If so the likely problem is excess current draw while
the vehicles ignition is in the off position.

5

Checks the state of charge of the battery.

6

Checks if the battery is capable of delivering the required load by performing the load test procedure.

Diagnostic Table Notes

1

For all wiring harness fault diagnosis, refer to 8A Electrical Body & Chassis.

2

For wiring harness repairs, refer to 8A Electrical Body & Chassis.

3

Refer to 6D1 – 3 Battery – V6.

Diagnostic Table

Step Action

Yes

No

1

Have you read and understood the safety precautions for working with
batteries?

Go to Step 2

Refer to 2

Safety

Precautions

2

Check the battery fitted is the correct specification recommended for
the vehicle? Refer to 5

Specifications.

Is the battery the correct specification?

Go to Step 3

Replace the battery

with the correct

specification

3

Perform the battery inspection, refer to 3.2 Battery Inspection.

Does the battery appear serviceable?

Go to Step 4

Replace the battery,

refer to 4.1

Battery

4

Does the customer complain the battery loses charge if the engine is
not started for an extended period?

Preform the battery

current draw test,

refer to 3.5

Battery

Current Draw Test

Go to Step 5