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.