2007 ISUZU KB P190 Workshop Repair Manual

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Page 3617 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Starting System – V6 Page 6D1-2–9

Figure 6D1-2 – 3

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ISUZU KB P190 2007

Page 3618 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Starting System – V6 Page 6D1-2–10

2.5 Starting System Inoperative /
Malfunctioning
Circuit Description
The battery cable supplies a constant connection from the battery to starter solenoid

Starting System – V6 Page 6D1-2–10

2.5 Starting System Inoperative /
Malfunctioning
Circuit Description
The battery cable supplies a constant connection from the battery to starter solenoid connector P – 4.
W hen the ignition switch is turned to the START position, 12 V is applied to the ECM connector C – 56 pin 31.
For vehicles with 4 speed automatic transmission, when the transmission is in park (P) or neutral (N), the park / neutral
and back-up switch grounds ECM connector C – 56 pin 32.
The ECM provides a ground for the start relay, ECM connector C – 56 pin 35 to start relay connector X – 13 pin 5.
W hen activated the start relay provides 12 V to starter solenoid connector P – 3 pin 1.
The solenoid closes its switch contacts to connect the battery voltage at the solenoid switch terminal P – 4 terminal B to
the DC motor. The pull-in winding of the solenoid switch is grounded through the DC motor winding and brushes. The
hold-in winding is grounded through the solenoid casing. The DC motor is grounded through the starter motor casing.
Refer to 2.4 W iring Diagram to aid in diagnosis.
Diagnostic Table Notes
Reference to following information will assist when diagnosing starting circuit faults:
1 If the battery, starter motor and fuel system are deemed as serviceable and a ‘no crank’ and / or ‘no start’ condition exists, refer to the following Sections as required:
a 11A Immobiliser for theft deterrent engine crank inhibitor related faults
b 6C1-2 Engine Management V6 Diagnostics, for starter relay circuit faults
2 For all wiring harness fault diagnoses, refer to 8A Electrical Body and Chassis.
3 For wiring harness repairs, refer to 8A Electrical Body and Chassis.
4 Refer to 8A Electrical Body and Chassis for harness routing.
5 Ensure the battery, cables and connections are in good order. Refer to 8A Electrical Body and Chassis.
Diagnostic Table
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 Turn the ignition switch to the START position and then release it.
Did the engine crank or were there any clicking or chattering sounds
from the solenoid? Go to Diagnostic
Table – Slow
Cranking, Solenoid Clicks or Chatters Go to Step 4
4 Inspect fusible link SBF9, refer to 8A Electrical Body and Chassis.
Is fusible link SBF9 blown? Replace the faulty
fusible link (refer to
Note 3).
If the fusible link
blows again, repair
or replace the circuit from SBF9 to the
starter relay X – 13 pin 1 or ignition
switch B – 62 pin 2 (refer to Note 2) Go to Step 5

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ISUZU KB P190 2007

Page 3619 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Starting System – V6 Page 6D1-2–11

Step Action Yes No
5
Inspect fusible link SBF1, refer to 8A Electrical Body and Chassis.
Is fusible link SBF1 blown? Replace the faulty
fusible link (r

Page 3620 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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 /

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 W hile 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 W ith the aid of an assistant, monitor the voltage on the multimeter and turn the ignition switch to START.
• W ith the ignition switch in the START position, the
multimeter should display battery voltage
• W ith 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.
W as 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.
W as the circuit serviceable? Go to Step 2 Repair as required
(refer to Note 2).
Go to Step 21
15 NOTE
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 W hile 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

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ISUZU KB P190 2007

Page 3621 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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 W hile monitoring Tech 2, turn the ignition

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 W hile 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 W ith 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 W ith 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.
W as 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.

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ISUZU KB P190 2007

Page 3622 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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
Syste

Page 3623 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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 c

Page 3624 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Starting System – V6 Page 6D1-2–16

Engine Compartment Relay And Fuse Panel

Figure 6D1-2 – 4

1 Remove fuses SBF5 and SBF9 from the engine compartment fuse panel to disable the ignit

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