2007 ISUZU KB P190 ignition

Fuel System – V6 Page 6C – 13

4 Service Operations
4.1 Fuel Lines And Quick Connect Fittings
Description
The fuel line connector fittings contain the following
components:
1 O-rings
2 Fuel line port
3 Connector
4 Plastic fuel line tube

Figure 6C – 8

Leak Test and Inspection
1. Turn the ignition key to the ON position and ensure the fuel pump runs for a short time by listening for the pump start up sound. The fuel pressure will increase when the fuel pump is actuated.
2 Perform a preliminary check of the system by inspecting the system for any leaks around the connections and fittings.
3 Perform steps 1 and 2 several times.
4 If the preliminary check of the system produces no leaks, start the engine and check the system again for any sign of leaks around the connections and lines.

Ensure all service precautions have been
observed prior to removing any connector
fittings.


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ISUZU KB P190 2007

Fuel System – V6 Page 6C – 19

Remove

• A depressurised fuel system contains fuel
in the fuel filter and fuel lines that can be
spilled during service operations.
• Fuel vapour remains in the fuel tank even
when completely empty. Seal all openings
in the fuel tank using suitable material or a
plastic plug. Ensure no naked flames or
other ignition sources are nearby. Ensure
all cellular phones (and transmission
devices that may cause any metal objects
to become unintentional receiving
antennas) are switched off.
• Place a dry chemical (Class B) fire
extinguisher nearby before performing any
on-vehicle service procedures. Failure to
follow these precautions may result in
personal injury.
1 Remove the fuel pump relay, refer to 8A Electrical Body and Chassis.
2 Depressurise the fuel system, refer to 3.4 Fuel System Depressurisation.

Never drain or store fuel into an open
container, due to the possibility of fire or
explosion.
3 Siphon the fuel tank, using commercially-available equipment.

Before proceeding, clean all traces of dirt and
other foreign material from the top of the fuel
tank, near the modular fuel pump and sender
assembly.
7 Place a drain tray under the fuel filter area.

Fuel can spill from the disconnected filter.

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Fuel System – V6 Page 6C – 23

4.5 Modular Fuel Pump and Sender
Assembly
NOTE
If the modular fuel pump and sender assembly
develops a fault it must be replaced as a
complete unit. The only serviced parts are the
retainer locking ring and the O-ring seal.
Remove

• A depressurised fuel system contains fuel
in the fuel filter and fuel lines that can be
spilled during service operations.
• Fuel vapour remains in the fuel tank even
when completely empty. Seal all openings
in the fuel tank using suitable material or a
plastic plug. Ensure no naked flames or
other ignition sources are nearby. Ensure
all cellular phones (and transmission
devices that may cause any metal objects
to become unintentional receiving
antennas) are switched off.
• Place a dry chemical (Class B) fire
extinguisher nearby before performing any
on-vehicle service procedures. Failure to
follow these precautions may result in
personal injury.
• Wear safety glasses when using
compressed air. Do not blow compressed
air directly onto any body part.
1 Remove the fuel pump relay, refer to 8A Engine Body and Chassis.
2 Remove the fuel tank assembly from the vehicle, refer to 4.4 Fuel Tank.

Before proceeding, clean all traces of dirt and
other foreign material from the top of the fuel
tank, near the modular fuel pump and sender
assembly.
3 Use compressed air to ensure all dirt and foreign materials are removed from all fuel connections before disconnecting the parts.

Fuel can spill from the disconnected modular
fuel pump and sender assembly.

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Fuel System – V6 Page 6C – 26


Fuel vapour remains in the fuel tank even
when completely empty. Seal all openings in
the fuel tank using suitable material or a
plastic plug. Ensure no naked flames or other
ignition sources are nearby. Ensure all
cellular phones (and transmission devices
that may cause any metal objects to become
unintentional receiving antennas) are
switched off.
15 Place a suitable material over the opening in the fuel tank to prevent any foreign matter from entering the fuel system.
Fuel Level Sender Assembly
Test
1 Measure the resistance across terminals 2 and 3 of the fuel pump connector. Take the following
measurements:
a W ith the float arm assembly in the empty position, the resistance should be approximately
250 Ω.
b W ith the float arm assembly rotated to the full position, the resistance should be approximately
40 Ω.
2 If the resistance at either of these positions is not within tolerance, replace the modular fuel pump and
sender assembly.

Figure 6C – 27
Reinstall
Reinstallation of the modular fuel pump and sender assembly is the reverse of the removal procedure, noting the
following:
1 Fit a new O-ring (3) to the modular fuel pump and sender assembly.
2 Install the modular fuel pump and sender assembly into the fuel tank, taking care not to damage the fuel sender float or arm.
3 Ensure the locator in the pump cover engages in the slot in the fuel tank opening.
4 Using tool No. AU469 and a half-inch breaker bar, install the modular fuel pump and sender assembly cover retainer lock ring by turning it clockwise.
5 Refit the three quick connect fittings.




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Fuel System – V6 Page 6C – 30

4.7 Fuel Tank Siphon Procedure

• Fuel vapour remains in the modular fuel
pump and sender assembly and fuel lines
that can be spilled during service
operations. Ensure no naked flames or
other ignition sources are nearby. Ensure
all cellular phones (and transmission
devices that may cause any metal objects
to become unintentional receiving
antennas) are switched off.
• Place a dry chemical (Class B) fire
extinguisher nearby before performing any
on-vehicle service procedures. Failure to
follow these precautions may result in
personal injury.
For an exploded view of fuel tank components, refer Figure 6C – 17.
1 Depressurise the fuel system, refer to 3.4 Fuel System Depressurisation.
2 Reinstall the fuel pump relay, refer to 8A Electrical Body and Chassis.

Disconnecting the battery affects certain
vehicle electronic systems. 1.1 WARNING,
CAUTION and NOTES.
3 Disconnect the negative battery terminal.
4 Remove the fuel filler cap.
NOTE
Lubricate the fuel siphon hose with J36850
TransJel Transmission Assembly Lubricant or
equivalent to aid hose insertion. Use only an
approved lubricant.
5 Install J44284–2 flapper door holder (2) into the fuel filler neck to hold the door open.

Do not siphon, drain or store fuel into an
open container, due to the possibility of fire
or explosion, or contamination. Always use
and approved fuel storage container.
6 Insert the J45004–1 fuel tank siphon hose (1) into the fuel tank filler neck and gradually twist it until the tip of
the hose meets the fuel tank check valve (3) and
continues to the bottom of the fuel tank.
7 Use a hand-operated or air-operated pump device to siphon as much fuel through the fuel fill pipe as
possible.

Figure 6C – 35

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Fuel System – V6 Page 6C – 31


Fuel vapour remains in the fuel tank even
when completely empty. Seal all openings in
the fuel tank using suitable material or a
plastic plug. Ensure no naked flames or other
ignition sources are nearby. Ensure all
cellular phones (and transmission devices
that may cause any metal objects to become
unintentional receiving antennas) are
switched off.

Do not use excessive force when removing
the fuel siphon hose from the fuel filler neck.
If the fuel siphon hose gets stuck upon
removal, gently twist and tug the fuel siphon
hose back and forth until it releases.
NOTE
• If fuel does not siphon from the fuel tank, the
fuel siphon hose may have entered the fuel
tank through a roof-facing check valve
opening. If required, insert the J45004–1 fuel
siphon hose (1) into the fuel tank filler neck,
refer to Figure 6C – 35, but twist the fuel
siphon hose 90° as it slides down the filler
neck. This enables the fuel siphon hose to
enter the fuel tank through a floor-facing
check valve opening.
• The siphon procedure will not remove all fuel
from the fuel tank. If required, fuel remaining
in the fuel tank may be siphoned out through
the top of the fuel tank, once the modular fuel
pump and sender assembly is removed from
the tank, refer to 4.4 Fuel Tank.
8 Remove the siphon equipment.

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Fuel System – V6 Page 6C – 33

4.9 Fuel Lines
Remove

• A depressurised fuel system contains fuel
in the fuel filter and fuel lines that can be
spilled during service operations.
• Fuel vapour remains in the fuel tank even
when completely empty. Seal all openings
in the fuel tank using suitable material or a
plastic plug. Ensure no naked flames or
other ignition sources are nearby. Ensure
all cellular phones (and transmission
devices that may cause any metal objects
to become unintentional receiving
antennas) are switched off.
• Place a dry chemical (Class B) fire
extinguisher nearby before performing any
on-vehicle service procedures. Failure to
follow these precautions may result in
personal injury.
• Wear safety glasses when using
compressed air. Do not blow compressed
air onto any body part.
1 Remove the fuel pump relay, refer to 8A Electrical Body and Chassis.
2 Depressurise the fuel system, refer to 3.4 Fuel System Depressurisation.

Never drain or store fuel into an open
container, due to the possibility of fire or
explosion.
3 Raise the vehicle, preferably on a hoist, refer to 0A General Information.

Before proceeding, clean all traces of dirt and
other foreign material from the fuel lines.
4 Use compressed air to ensure that all dirt and foreign materials are removed from all fuel connections before the parts are disconnected.
5 If required, remove the stone guard, refer to Figure 6C – 17 and fuel lines. Use the following illustrations showing the fuel line layout and location of other items relating to the fuel system as a guide, also refer to 4.1 Fuel Lines
And Quick Connect Fittings and 4.6 Evaporative Emission Control Canister.







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Engine Management – V6 – General Information Page 6C1-1–1

6C1-1 Engine Management – V6
General Information
ATTENTION
Before performing any service operation or other procedure described in this Section, refer to 1.3 Warning
Caution and Notes for correct workshop practices with regard to safety and / or property damage.
1 General Information ............................................................................................................ ...................3
1.1 Introduction ............................................................................................................................................................ 3
1.2 Emission Control ................................................................................................................................................... 3
ADR 79/01 Emissions Standards .......................................................................................................................... 3
1.3 Warning Caution and Notes .................................................................................................................................. 4
Definition of WARNING, CAUTION and NOTE Statements ............................................................................. .... 4
WARNING defined ............................................................................................................................................. 4
CAUTION defined .............................................................................................................................................. 4
NOTE defined..................................................................................................................................................... 4
2 Component Locations ............................................................................................................ ...............5
2.1 Cylinder Numbering............................................................................................................................................... 5
2.2 Engine Compartment............................................................................................................................................. 5
2.3 Engine ..................................................................................................................................................................... 6
2.4 Interior..................................................................................................................................................................... 8
3 System Operation ...................................................................................................................................9
3.1 Fuel Delivery System ............................................................................................................................................. 9
Fuel System Pressure ........................................................................................................... ................................ 9
Fuel Injection System .......................................................................................................................................... 10
Short Term Fuel Trim ....................................................................................................................................... 10
Long Term Fuel Trim ........................................................................................................................................ 10
3.2 Air / Fuel Control System ...................................................................................................... .............................. 11
Starting Mode ....................................................................................................................................................... 11
Run Mode.............................................................................................................................................................. 11
Open Loop Mode................................................................................................................. ............................. 11
Closed Loop Mode ............................................................................................................... ............................ 11
Acceleration Mode .............................................................................................................. ................................. 11
Deceleration Mode ............................................................................................................................................... 11
Fuel Shut-off Mode .............................................................................................................................................. 11
Battery Voltage Correction Mode ................................................................................................ ....................... 12
Limp Mode ............................................................................................................................................................ 12
Engine Protection Mode ......................................................................................................... ............................. 12
Clear Flood Mode ................................................................................................................................................. 12
3.3 Ignition Control System........................................................................................................ ............................... 12
3.4 Starter Motor Operation....................................................................................................................................... 12
3.5 Throttle Actuator Control System ............................................................................................... ....................... 12
Description ........................................................................................................................................................... 12
Throttle Body Relearn Procedure ....................................................................................................................... 14
TAC System Default Actions / Reduce Power Modes................................................................................ ....... 14
Forced Engine Shutdown .................................................................................................................................... 14
3.6 Cruise Control System ........................................................................................................................................ 14
3.7 Brake Torque Management ........................................................................................................ ......................... 15
3.8 Emission Control Systems.................................................................................................................................. 15
Evaporative Emission Control System ............................................................................................ .................. 15
Engine Ventilation System .................................................................................................................................. 16

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