2007 ISUZU KB P190 check engine

Engine Mechanical – V6 Page 6A1–34
Page 6A1–34
2.4 Engine Misfire with Abnormal Internal
Lower Engine Noises
Cause Correction
Abnormalities, severe cracking, bumps or missing areas in
the accessory drive belt.
Abnormalities in the accessory drive system and/or
components may cause engine speed variations that result
in a misfire diagnostic trouble code (DTC). A misfire code
may be present without an ac tual misfire condition. Replace the accessory drive belt, refer to 3.5 Accessory
Drive Belt.
Refer to 6C1-2 Engine Management – V6 – Diagnostics to
check for DTCs
Worn, damaged or misaligned accessory drive components
and excessive pulley run-out may lead to a misfire DTC.
A misfire code may be present without an actual misfire
condition. Inspect the components and repair or replace as required.
Refer to 6C1-2 Engine Management – V6 – Diagnostics to
check for DTCs
Loose or Incorrectly fitted flexplate or crankshaft balancer
assembly.
A misfire code may be present without an actual misfire
condition. Repair or replace the flexplat
e or crankshaft balancer as
required, refer to 3.13 Crankshaft Balancer Assembly or
4.3 Flexplate Assembly.
Worn or broken piston rings.
Oil consumption may or may not cause an actual misfire. 1 Inspect the spark plugs for oil deposits, refer to 6C1-3
Engine Management – V6 – Service Operations.
2 Check the cylinders for a loss of compression, refer to 2.15 Engine Compression Test.
3 Perform compression testing to identify the cause of
low compression.
4 Repair or replace components as required.
Worn crankshaft thrust bearing.
Severely worn thrust surfaces on the crankshaft and/or
thrust bearing may permit fore and aft movement of the
crankshaft and create a DTC wi thout an actual misfire
condition being present. Replace the crankshaft and/or bear
ings as required, refer to
4.6 Crankshaft and Main Bearings.
Refer to 6C1-2 Engine Management – V6 – Diagnostics to
check for DTCs

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–37
Page 6A1–37
2.7 Engine Misfire with Excessive Oil
Consumption
Cause Correction
Worn valves, valve guides and/or valve stem oil seals. 1 Inspect the spark plugs for coolant saturation, refer to
6C1-3 Engine Management – V6 – Service
Operations.
2 Repair or replace components as required, refer to 3.22 Cylinder Head Assembly.
Worn or broken piston rings.
Oil consumption may or may not cause an actual misfire. 1 Inspect the spark plugs for oil deposits, refer to 6C1-3
Engine Management – V6 – Service Operations.
2 Check the cylinders for a loss of compression, refer to 2.15 Engine Compression Test.
3 Perform compression testing to identify the cause of
low compression.
4 Repair or replace components as required.

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–42
Page 6A1–42
2.12 Engine Will Not Crank – Crankshaft Will
Not Rotate
Cause Correction
Seized accessory drive system component. 1 Remove the accessory drive belt, refer to
3.5 Accessory Drive Belt.
2 Rotate the crankshaft by hand at the balancer pulley or flywheel.
3 Repair or replace accessory drive system components as required.
Hydraulically locked cylinder caused by:
• coolant in cylinder,
• oil in cylinder, or
• fuel in cylinder. 1 Remove the spark plugs and check for fluid, refer to
6C1-3 Engine Management – V6 – Service
Operations.
2 Inspect for broken head gasket/s.
3 Inspect for cracked engine block or cylinder head.
4 Inspect for sticking fuel injector.
5 Repair or replace components as required.
Seized torque converter. 1 Remove the torque converter bolts, refer to 7C1
Automatic – 4L60E – General Information – 4L60E –
General Information.
2 Rotate the crankshaft by hand at the balancer pulley or flywheel.
3 Repair or replace torque converter as required.
Material in cylinder bore, caused by:
• broken valve,
• broken piston or ring, or
• dirt or foreign matter entry during engine assembly
procedure. 1 Clean and inspect the cylinder for damaged
components and or foreign matter, refer to 4.7
Cylinder Block.
2 Repair or replace components as required.
Seized crankshaft or connecting rod bearings. Inspect and repair or replace crankshaft, connecting rod
and bearings as required, refer to 4.5 Pistons, Pins, Rings,
Connecting Rods and Big-end Bearings and 4.6
Crankshaft and Main Bearings.
Bent or broken connecting rod. Inspect and repair or replace connecting rod and bearings
as required, refer to 4.5 Pistons, Pins, Rings, Connecting
Rods and Big-end Bearings.
Bent or broken crankshaft. Inspect and repair or replace crankshaft and bearings as
required, refer to 4.6 Crankshaft and Main Bearings.
Seized or broken camshaft. 1 Inspect and replace camshafts as required, refer to
3.19 Camshaft.
2 Inspect camshaft journals and cam caps on cylinder head and repair or replace components as required,
refer to 3.22 Cylinder Head Assembly.
Seized or broken camshaft timing components. 1 Inspect the crankshaft, idler, intake camshaft and
exhaust camshaft sprockets.
2 Inspect the timing chains.
3 Inspect the guides.
4 Inspect the tensioners.
5 Repair or replace components as required, refer to 3.16 Timing Chains, Tensioners, Shoes and Guides.
Seized or broken valve train components. 1 Inspect the stationary hydraulic lash adjusters, refer
to 3.21 Stationary Hydraulic Lash Adjuster.
2 Inspect the rocker arms, re fer to 3.20 Rocker Arm.
3 Inspect the Valves Refer to 3.22 Cylinder Head Assembly.
4 Inspect the valve springs, refer to 3.22 Cylinder Head Assembly.
5 Repair or replace components as required.

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–48
Page 6A1–48
2.18 Engine Oil Leak Diagnosis
Introduction
It is important to correctly identify the source of an engine oil leak. For example, a power steering fluid leak or spillage
during servicing can travel across the va lley area of the engine and run-out the weep hole, which is located at the back of
the cylinder block. Failure to correctly identify the source of an engine oil leak can lead to unnecessary replacement of
engine components.
Most fluid leaks can be repaired by repairi ng or replacing the faulty component or resealing the gasket surface. However,
once a leak is identified it is im portant to determine and repair the c ause as well as the leak itself.
Locating and Identifying the Leak
Inspect the leaking fluid and determine whet her it is engine oil, transmission fluid, power steering fluid, brake fluid or
some other fluid. If unsure of the source of the leaking lubricant, a quick check of fluid levels should indicate where the
fluid is coming from, as one or more fluid level should be low.
Visual Inspection
Once the type of leaking fluid has been determined, a visual inspection of the affected system should be performed.
When performing the visual inspection:
1 Bring the vehicle to the normal operating temperature.
2 Park the vehicle over a large s heet of paper or other clean surface.
3 Leave the vehicle idling for 2-3 minut es, then check for dripping fluid.
4 If required, identify the type of fluid leak ing and the approximate location of the leak.
5 Visually inspect the suspected area. A small mirror may assist viewing areas that are difficult to see normally.
6 Check for leaks at all sealing surfaces and fittings.
7 Check for any cracked or damaged components.
8 If the leak cannot be located, completely clean the entire engine and surrounding components, drive the vehicle at
normal operating temperature for several k ilometres and then repeat Steps 3 to 8.
9 If the leak still cannot be located, proceed with either the Powder Method or Black Light and Dye Method as
outlined below.
Powder Method
1 Completely clean the entir e engine and surrounding components.
2 Apply an aerosol type powder (e.g. f oot powder) to the suspected area.
3 Operate the vehicle at normal operating temperature and at varying speeds for several kilometres.
4 Identify the source of the leak from the discoloration of the powder around the suspect components.
5 If required, use a small mirror to assist in vi ewing areas that are difficult to see normally.
6 Refer to Possible Causes for Engine Oil Leaks in this Section, and repair or replace components as required.
Black Light and Dye Method
A black light and die kit Tool No. J28428-E or a commercially av ailable equivalent is available to technicians to aid in
engine oil leak diagnosis. When using a black light and die kit fo r the first time, it is recommended the technician read the
manufacturers instructions prior to using the kit.
1 Add the specified amount of dye, as per manufacturers instructions, into the engine or suspected source of the oil
leak.
2 Operate the vehicle at normal operating temperature and at varying speeds for several kilometres.
3 With the vehicle parked on a flat leve l surface, aim the black light at the suspected component/s. The dyed fluid will
appear as a yellow path leading to the oil leak source
4 Refer to Possible Causes for Engine Oil Leaks in this Section, and repair or replace components as required.

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Engine Mechanical – V6 Page 6A1–51
Page 6A1–51
2.20 Accessory Drive Belt Diagnosis
Tension Check
NOTE
An accessory drive belt that squeaks when the
engine is started or st opped is considered normal
and has no effect on drive belt durability.
1 Start the engine and switch off the air-conditioning system . Allow engine to run until normal operating temperature
has been reached.
2 Turn the engine off and inspect the markings on the drive belt tensioner to confi rm the drive belt tension is
within the operating limits.

3 If the markings on the drive belt tensioner were outside the acceptable operat ing limits, replace the
accessory drive belt, refer to 3.5 Accessory Drive
Belt .

NOTE
The operating limits for acceptable drive belt
tension are when the driv e belt tensioner pointer
(1) is aligned between the outer edge of the
minimum and maximum tension marks (2).
Figure 6A1 – 21

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–56
Page 6A1–56
Step Action Yes No
3 1 Remove the drive belt, refer to 3.5 Accessory Drive Belt.
2 Operate the engine for no more than 40 seconds.
Does the squealing noise still exist? Accessory drive
system OK.
Go to 2.2
Symptoms, and
restart the diagnosis
of the noise Go to Step 4
4
Inspect the accessory drive components for a seized bearing and
general malfunctions.
Did you find and correct any seized bearings or general malfunctions
in the accessory drive system? Go to Step 9 Go to Step 5
5
Test the accessory drive belt tensi oner for correct operation, refer to
Accessory Drive Belt Tensioner Diagnosis.
Did you find and repair any problems with t he tensioner? Go to Step 9 Go to Step 6
6
Inspect the accessory drive belt is the correct length, refer to 3.5
Accessory Drive Belt.
Did you find and repair any problems with the drive belt length? Go to Step 9 Go to Step 7
7 Inspect the accessory drive pulleys for misalignment.
Did you find and correct any misaligned accessory drive pulleys? Go to Step 9 Go to Step 8
8 Check the accessory drive pulleys are the correct size.
Did you find and replace any incorrect pulleys? Go to Step 9 Refer to Diagnostic
Aids in this Section
9 Reinstall the accessory drive belt and operate the system to confirm
the repair.
Did you correct the squeal noise? Accessory drive
system OK Go to 2.2
Symptoms, and
restart the diagnosis

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–66
Page 6A1–66
3 Minor Service Operations
ATTENTION
The V6 engine is a combination of numerous components, containing machined, honed, polished and lapped
surfaces manufactured on the latest, high technology production equipment. Many of the components
contain tolerances measured in thousa ndths of a millimetre. Consequently, when any e ngine component is to
be serviced, care and cleanliness are extremely important.
Prior to re-assembly of the engine, all components mu st be cleaned and inspected in accordance with the
relevant clean and inspect procedur es throughout this Section, and repl aced or repaired where required.
In addition to cleaning and inspecting components, a liberal coating of engine oil should be applied to friction
surfaces during assembly to protect and lubr icate the surfaces on initial operation.
When performing any service operation, it should be understood that correct cleaning and protection of
machined surfaces and friction areas is part of the repair procedure. This is considered standard workshop
practice, even if not specifically stated. Torque va lues must be used as specified during reassembly to
ensure correct retention of all components.
Through out this section, fastener torque wrench sp ecifications may be accompanied with the following
identification marks:
■ Fasteners must be replaced after loosening.
Fasteners either have micro encapsulated sealant a pplied or incorporate a mechanical thread lock and
should only be re-used once. If in doubt, replacement is recommended.
If one of these identification marks is present alongs ide a fastener torque wrench specification, the
recommendation regarding that fastener must be adhered to.
3.1 Engine Oil
The procedure outlined below is typically the same for both rear wheel drive and all wheel drive vehicles.
Check
The following procedure is applicable to both rear wheel and all wheel drive vehicles
1 Run the engine to bring it to normal operating temperature.
2 Park the vehicle on a level surface. A vehicle that is not level will affect the accuracy of the level reading.
3 Stop the engine and wait 5 to 10 minutes to a llow the oil to drain back into the oil pan.
4 Remove the oil level indicator (1) and wipe clean.
5 Insert the indicator, ens uring it is fully seated.
6 Slowly remove the indicator to avoid smearing. Hold it horizontally or with lower end slightly down to avoid
oil running along indicator.
7 Observe the oil level where it passes over the centre
line of the indicator.
8 If the level is lower than the Add mark (2), add enough oil to the engine to reach the Upper mark (3).
Do not add too much oil as the reading should never
be above the Upper mark.
NOTE
When topping up the oil, allow approximately 5
to 10 minutes for the added oil to fully drain into
the oil pan.
Figure 6A1 – 23

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–67
Page 6A1–67
Replace
NOTE
• Quicker and more complete draining will
occur if the engine oil is at normal operating
temperature. However, care must be taken to
avoid scalding from the hot oil.
• It recommended the oil filter be changed at
each engine oil change, refer to 3.2 Oil Filter.
1 Remove the oil fill cap.
2 To ensure complete draining of the oil pan, raise the front and rear of the vehicle to maintain a level attitude. If not
using a hoist, support the vehicle with safety stands, refer to Section 0A General Information.
3 Clean any foreign material from around the oil drain pl ug and place a suitable, clean drain tray under the engine.

The oil may be hot. Avoid contact with the oil.
Ensure that eyes and skin are protected.
4 Remove the drain plug (1), taking care to avoid sca lding from the hot oil. Allow the oil to drain.
5 Clean and inspect the drain plug threads . If damaged, replace the drain plug.

Figure 6A1 – 24
6 Once the oil has completely drained, reinstall the dr ain plug and tighten to the correct torque specification.
Oil pan drain plug
torque specificat ion ............................................ 25.0 Nm
7 Replace the oil filter, refer to 3.2 Oil Filter.
8 Lower the vehicle to the ground and fill with the specified amount of SAE 5W30 lubricant.
Engine Oil Capacity:
With Oil Filter Change........................................6.5 litres
9 Install the oil fill cap.
10 Start the engine and check for leaks.

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ISUZU KB P190 2007