Isuzu KB P190. Manual — part 905

Starting System – V6

Page 6D1-2–12

Step Action

Yes

No

10 1

Connect Tech 2 to the DLC.

2

Ignition on, engine off.

3

On Tech 2 select:
Engine / V6 Engine / Data Display / Data List /
Electrical/Theft Data.

4

On Tech 2 scroll to Crank Request.

5

While monitoring Tech 2, turn the ignition switch to START.

Does Tech 2 display the following:

Inactive with the ignition switch in the ON position, Active with the
ignition switch in the START position?

Go to Step 15

Go to Step 11

11 1

Disconnect the ECM connector C – 56.

2

Using a multimeter set to measure voltage, back probe between
the harness connector C56 – X2 pin 31 and ground.

3

With the aid of an assistant, monitor the voltage on the
multimeter and turn the ignition switch to START.

•

With the ignition switch in the START position, the
multimeter should display battery voltage

•

With the ignition switch in the ON position, the multimeter
should display 0 V

Does the multimeter display as described?

Refer to 6C1 - 3

Engine

Management – V6 –

Service Operations

for further diagnosis.

Go to Step 21

Go to Step 12

12 Test the ignition switch, refer to 3B Steering.

Is the ignition switch serviceable?

Go to Step 13

Replace the faulty

ignition switch.

Refer to 3B

Steering

Go to Step 21

13 Check for short to ground or open circuit from the ignition switch start

terminal to the ECM connector C – 56 pin 31.

Was the circuit serviceable?

Go to Step 14

Repair as required

(refer to Note 2).

Go to Step 21

14 Check for short to ground or open circuit from the ignition switch

terminal B1 to the fuse SBF5.

Was the circuit serviceable?

Go to Step 2

Repair as required

(refer to Note 2).

Go to Step 21

15

N O T E

This procedure is only required on vehicles fitted with
manual transmissions. If the vehicle is fitted with an
automatic transmission, go to Step 16

1 Scroll

to

Starter Relay

2

While monitoring Tech 2, turn the ignition switch to START.

Does Tech 2 display the following:

Off with the ignition switch in the ON position,

On with the ignition switch in the START position?

Go to Step 21

Go to Step 16

Starting System – V6

Page 6D1-2–13

Step Action

Yes

No

16 1 Scroll

to

Starter Relay

2

Ensure the transmission is in park (P) or neutral (N).

3

While monitoring Tech 2, turn the ignition switch to START.

Does Tech 2 display the following:

Off with the ignition switch in the ON position,

On with the ignition switch in the START position?

Go to Step 18

Go to Step 17

17 1

Disconnect the ECM connector C – 56.

2

Using a multimeter set to measure voltage, back probe between
the harness connector C – 56 pin 32 and ground.

3

With the aid of an assistant, monitor the voltage on the
multimeter.

•

Place the transmission in park (P), the multimeter should
display 0 V

•

Place the transmission in neutral (N), the multimeter should
display 0 V

Does the multimeter display as described?

Refer to 6C1 - 3

Engine

Management – V6 –

Service Operations

for further diagnosis.

Go to Step 21

For vehicles fitted

with the 4 speed

automatic

transmission refer

to 7C2 Automatic

Transmission –

4L60E – On-vehicle
Servicing for further

diagnosis of the

park / neutral and

back-up switch.

Go to Step 21

18 Test the starter relay.

Refer to 6C1-2 Engine Management – V6 – Diagnostics.

Is the starter relay serviceable?

Go to Step 19

Repair or replace

as required

Go to Step 21

19 1

Using a multimeter set to measure voltage, back probe between
the harness connector P – 3 pin 1 and ground.

2

With the aid of an assistant, monitor the voltage on the
multimeter.

•

Turn the ignition switch to START, the multimeter should
display 7.0 V

Does the multimeter display as described?

Repair or replace

the starter motor as

required.

Refer to 4

Major

Service Operations.

Go to Step 21

Go to Step 20

20 Check for short to ground or open circuit from connector P – 3 pin 1

and the starter relay connector X-13 pin 2.

Was the circuit serviceable?

Go to Step 2

Repair as required

(refer to Note 2).

Go to Step 21

21 Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

When all diagnosis and repairs are completed, check the system for correct operation.

Starting System – V6

Page 6D1-2–14

Diagnostic Table – Slow Cranking, Solenoid Clicks or Chatters

Step Action

Yes

No

1

Did you review 1.3

System Operation?

Go to Step 2

Go to 1.3

System

Operation.

2

Did you read 2.3 Diagnostic Systems Check

Go to Step 3

Go to 2.3

Diagnostic

Systems Check.

3

Perform the 3.3 On-Vehicle Testing.

Did you correct the condition?

Go to Step 4

Repair or replace
the starter motor.

Refer to 4

Major

Service Operations.

Go to Step 4

4

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

When all diagnosis and repairs are completed, check the system for correct operation.

Starting System – V6

Page 6D1-2–15

3

Minor Service Operations

3.1 Safety

Precautions

Observe the following precautions. Failure to observe these precautions can result in serious damage to components.

•

Refer to 1.1 WARNING, CAUTION and NOTES in this Service Information before disconnecting the battery.

•

Use the starter motor on a negative ground system only.

•

When installing a battery, attach the positive (+) cable to the battery first. Then attach the negative cable.

•

When using a slave battery for starting purposes, ensure that both batteries are connected in parallel, that is.
positive to positive terminals and negative to negative terminals.

•

Only use jumper leads that have surge protection.

3.2 Maintenance

Regular Checks

Check the following at regular intervals:

•

Starter motor terminals – for corrosion and loose connectors.

•

Wiring – for damaged insulation.

•

Mounting bolts – for tightness.

•

Battery terminals – for clean and secure connections.

3.3 On-Vehicle

Testing

N O T E

The battery must be fully charged and in
serviceable condition before beginning these
tests, refer to 8A Electrical Body and Chassis.