body ISUZU KB P190 2007 Workshop Repair Manual

6E–258 ENGINE DRIVEABILITY AND EMISSIONS
EXCESSIVE EXHAUST EMISSIONS OR ODORS SYMPTOM
DEFINITIONS: Vehicle fails an emission test. There is excessive “rotten egg” smell. (Excessive odors do not
necessarily indicate excessive emissions.)
Step Action Value(s) Yes No
1 Was the “ On-Board Diagnostic (OBD) System Check ”
performed? — Go to Step 2Go to
OBD
System Check
2 1. Perform a bulletin search. 2. If a bulletin that addresses the symptom is found,correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom? — Verify repair Go to Step 3
3 Was a visual/physical check performed? —Go to Step 4Go to
Visual /
physical Check .
4 Does the customer continual accelerate On/Off during cold condition? — System OK Go to Step 5
5 Is the customer using the incorrect fuel type? —Replace with
unleaded fuel Go to Step 6
6 Check for vacuum leaks (vacuum lines, intake manifold, throttle body, etc.)
Were any vacuum leaks found? — Go to Step 17Go to Step 7
7 1. Check fuel cap for proper installation. 2. Secure the fuel cap if necessary.
Was a problem found? — Go to Step 17Go to Step 8
8 Check the fuel pressure. Refer to 6E-108 page “Fuel
System Diagnosis” .
Was a problem found? — Go to Step 17Go to Step 9
9 1. Check for faulty, plugged or incorrectly installed PCV valve.
2. Verify that the PCV system is not plugged.
Was a problem found? — Go to Step 17Go to Step 10
10 Check the injector connectors, if any of the injectors are connected to an incorrect cylinder, correct as
necessary.
Was a problem found? — Go to Step 17Go to Step 11
11 Perform the “Injector Coil/Balance Test
” (Refer to 6E-
98 page).
Was a problem found. — Go to Step 17Go to Step 12
12 Check for a problem with the engine cooling system. Was a problem found? — Go to Step 17Go to Step 13
13 Check EVAP canister for fuel loading. Refer to Evaporative Emission Control System.
Was a problem found? — Go to Step 17Go to Step 14
14 Check the EVAP purge solenoid valve operation. Is the valve operated normally? — Go to Step 17Verify repair &
Go to Step 15
15 Check the exhaust system for a possible restriction: • Damaged or collapsed pipes
• Internal catalytic converter failure
Was a problem found? —Verify repair &
Go to Step 16 Go to Step 17

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6E–266 ENGINE DRIVEABILITY AND EMISSIONS
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSOR
Location
Installed on the intake manifold.
Removal Procedure 1. Disconenct the negative battery cable.
2. Disconnect a MAP sensor connector from the MAP sensor.
3. Loosen a bolt and remove the MAP sensor from the intake manifold.
4. Remove the MAP sensor from the bracket.
Installation Procedure 1. Tighten the MAP sensor by a bolt with specified tightening torque.
Tightening Torque
• Bolt: 8N·m (0.8kgf·m) 2. Connect a MAP sensor connector to the MAP sensor.
3. Connect the negative battery cable.
NOTE: Verify any DTCs (diagnosis Trouble Code) are
not stored after replacement.
THROTTLE POSITION SENSOR (TPS)
Location
Installed on the throttle body.
Removal Procedure 1. Disconnect the negative battery cable.
2. Disconnect the TPS connector.
3. Loosen two screws and remove TPS from the throttle body.
Installation Procedure 1. Temporary tighten the TPS by two screws.
2. Connect a TPS connectors to the TPS.
3. Connect the Tech2 to the vehicle.
4. Connect the negative battery cable.
5. Select "Data Display" with the Tech2.
6. Check the throttle position data and adjust the TPS position.
7. Tighten two screws.
NOTE: Verify any DTCs (diagnosis Trouble Code) are
not stored after replacement.

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ENGINE DRIVEABILITY AND EMISSIONS 6E–267
IDLE AIR CONTROL (IAC) VALVE
Location
Installed on the throttle body.
Removal Procedure 1. Disconnect the negative battery cable.
2. Disconnect the IAC valve connector.
3. Loosen two screws and remove IAC valve from the throttle body.
Cleaning and Inspection 1. Clean the IAC valve O-ring sealing surface, pintle valve seat and air passage.
2. Use carburetor cleaner and a parts cleaning brush to remove carbon deposit.
Do not use a cleaner that contain methyl ethyl
ketone. This is an extremely strong solvent and not
necessary for this type of deposit.
3. Shiny spots on the pintle are normal and do not indicate misalignment or a bent pintle shaft.
4. Inspect the IAC valve O-ring for cuts, cracks or distortion.
Measurement
• Clean the IAC valve O-ring sealing surface, pintle valve seat and air passage.
• Use carburetor cleaner and a parts cleaning brush to remove carbon deposit. Do not use a cleaner that
contain methyl ethyl ketone. This is an extremely
strong solvent and not necessary for this type of
deposit.
• Shiny spots on the pintle are normal and do not indicate misalignment or a bent pintle shaft.
• Inspect the IAC valve O-ring for cuts, cracks or distortion. Replace the O-ring if damaged. Installation Procedure
1. Tighten the IAC valve by two screws.
2. Connect a IAC valve connector to the MAP sensor.
3. Connect the negative battery cable.
NOTE: Verify any DTCs (diagnosis Trouble Code) are
not stored after replacement.

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ENGINE EXHAUST 6F-3





























W hen inspecting or replacing exhaust system components,
make sure there is adequate clearance from all points on the
underbody to prevent overheating the floor pan and possible
damage to the passenger compartment insulation and trim
materials.
Check complete exhaust system and nearby body areas and
rear compartment lid for broken, damaged, missing or
mispositioned parts, open seams, holes, loose connections or
other deterioration which could permit exhaust fumes to seep
into the rear compartment or passenger compartment. Dust or
water in the rear compartment may be an indication of a
problem in one of these areas. Any faulty areas should be
corrected immediately.
Hangers
Various types of hangers are used to support exhaust
system(s). These include conventional rubber straps, rubber
rings, and rubber blocks.
The installation of exhaust system supports is very important,
as improperly installed supports can cause annoying vibrations
which can be difficult to diagnose.
Three Way Catalytic Converter (If applicable)
The three way catalytic converter is an emission control device
added to the exhaust system to reduce pollutants from the
exhaust gas stream.

CAUTION: The catalytic converter requires the use of
unleaded fuel only.
Periodic maintenance of the exhaust system is not required. If
the vehicle is raised for other service, it is advisable to check
the condition of the complete exhaust system.
A dual bed monolith catalytic converter is used in combination
with three way catalytic converter.
Catalytic Types:
Three way (Reduction/Oxidation) catalyst
The catalyst coating on the three way (reduction) converter
contains platinum and rhodium which lowers the levels of
nitrous oxide (NOx) as well as hydrocarbons (HC) and carbon
monoxide (Co).
Gasket
The gasket must be replaced whenever a new exhaust pipe,
muffler or catalytic converter is installed.

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ENGINE LUBRICATION 6G-5

Inspection and Repair
CAUTION: Make necessary correction or parts
replacement if wear, damage or any other abnormal
conditions are found through inspection.
Body and Gears
The pump assembly must be replaced if one or more of the
conditions below is discovered during inspection:
Indentation of gear pair - Use feeler strip and straight edge.
Dimension: 0.03 mm to 0.10 mm
(0.0012 to 0.0039 in)


Oil Strainer
Check the oil strainer for cracking and scoring. If cracking and
scoring are found, the oil strainer must be replaced.




Reassembly
1. Install oil pressure switch to the oil pump.
Torque: 40 N ⋅
⋅⋅
⋅
m (4.1 kgf ⋅
⋅⋅
⋅
m)
2. Install the oil pump with the sleeve and the gasket.
Torque: 6 N ⋅
⋅⋅
⋅
m (0.6 kgf ⋅
⋅⋅
⋅
m)
3. Install oil strainer.
Torque: 8 N ⋅
⋅⋅
⋅
m (0.8 kgf ⋅
⋅⋅
⋅
m)
4. Install the oil pan.
Tighten the bolts:
15 N ⋅
⋅⋅
⋅
m (1.5 kgf ⋅
⋅⋅
⋅
m)
5. Install crankshaft timing pulley.
Tighten the bolts:
20 N ⋅
⋅⋅
⋅
m (2.0 kgf ⋅
⋅⋅
⋅
m)


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INDUCTION 6J-3


Installation
1. Install air cleaner element.
2.
Attach the air cleaner duct cover to the body completely,
then clamp it with the clip.
3. Install mass air flow sensor.
4. Install mass air temperature sensor.
5. Install positive crankcase ventilation hose connector.



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Engine Mechanical – V6 Page 6A1–11

Figure 6A1 – 3
Legend
1 PCV Hose
2 PCV Hose O-Ring Outer (larger)
3 PCV Hose O-Ring Inner (smaller)
4 Upper Intake Manifold
5 Lower Intake Manifold
6 Upper Intake Manifold Bolt – Long
7 Upper Intake Manifold Bolt – Short
8 Lower Intake Manifold to Upper Intake Manifold Guide Pin
9 Upper Intake Manifold to Lower Intake Manifold Gasket
10 Lower Intake Manifold to Cylinder Head Gasket
11 Lower Intake Manifold Bolt
12 Fuel Rail Bolt
13 Fuel Rail
14 Fuel Injector
15 Fuel Injector Retainer
16 Fuel Injector Upper O-ring 17 Fuel Injector Lower O-ring
18 Fuel Pressure Service Valve Cap
19 Fuel Pressure Service Valve
20 Ball Stud
21 Fuel Injector Wiring Harness
22 Throttle Body
23 Throttle Body Bolt
24 Throttle Body Gasket
25 Throttle Body Engine Wiring Harness Clip
26 EVAP Purge Solenoid
27 EVAP Purge Solenoid Bolt
28 EVAP Purge Solenoid Tube
29 EVAP Purge Solenoid Bracket
30 BARO Sensor Bolt
31 BARO Sensor
32 BARO Sensor O-Ring

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Engine Mechanical – V6 Page 6A1–29

2.3 Engine Misfire without Internal 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 actual 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.
W orn, 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 DTC may be present without an actual misfire
condition. Repair or replace the flexplate or crankshaft balancer as
required, refer to 3.13 Crankshaft Balancer Assembly
or 4.3 Flexplate Assembly.
Refer to 6C1-2 Engine Management – V6 – Diagnostics to
check for DTCs
Restricted exhaust system.
A severe restriction in the exhaust flow can cause
significant loss of engine performance and may set a DTC.
Possible causes of restrictions in the exhaust system
include collapsed/dented pipes and blocked mufflers and/or
catalytic converters. Repair or replace exhaust system components as required,
refer to 8B Exhaust System.
Refer to 6C1-2 Engine Management – V6 – Diagnostics to
check for DTCs
Incorrectly installed or damaged vacuum hoses. Repair or replace vacuum hoses as required.
Incorrect sealing between the intake manifold and cylinder
heads, upper intake manifold and lower intake manifold,
throttle body and intake manifold. Repair or replace the intake manifold, throttle body gaskets,
cylinder heads, throttle body as required.
Incorrectly installed or damaged barometric
pressure(BARO) sensor and/or seal. The seal should not
be torn or damaged. Repair or replace the BARO sensor and/or seal as
required, refer to 6C1-3 Engine Management – V6 –
Service Operations.
Incorrectly installed or damaged EVAP purge solenoid
and/or O-ring seal. Repair or replace the EVAP purge solenoid and/or seal as
required, refer to 6C1-3 Engine Management – V6 –
Service Operations
W orn or loose stationary hydraulic lash adjusters (SHLA)
and/or rocker arms.
The SHLAs, rocker arms and roller bearings should be
intact and in the correct position. Replace the SHLAs and/or rocker arms as required, refer to
3.21 Stationary Hydraulic Lash Adjuster or 3.20
Rocker Arm.
Stuck valves.
Carbon build up on the valve stems can result in the valves
not closing correctly. Repair or replace as required, refer to 3.22 Cylinder Head
Assembly.
Excessively worn or misaligned timing chain/s. Replace the timing chain/s and components as required,
refer to 3.16 Timing Chains, Tensioners, Shoes and
Guides.
W orn camshaft lobes. Replace the camshaft/s and SHLAs as required, refer to
3.19 Camshaft or 3.21 Stationary Hydraulic Lash
Adjuster.
Excessive oil pressure.
A lubrication system with excessive oil pressure may lead
to excessive lash adjuster pump-up and loss of
compression. 1 Perform an oil pressure test, refer to 3.1
Engine Oil.
2 Repair or replace the engine oil pump as required, refer to 3.17 Oil Pump Assembly.

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Engine Mechanical – V6 Page 6A1–38

2.15 Engine Compression Test
A compression pressure test of the engine cylinders determines the condition of the rings, the valves and the head
gasket.
Preliminary Steps
1 Ensure the battery is fully charged.
2 Remove the spark plugs from all cylinders, refer to 6C1-3 Engine Management – V6 – Service Operations.
NOTE
DTCs will set when the fuel system or the ignition
system is disabled and the engine is cranked.
Disregard DTCs that set under this condition.
3 Disable the fuel system by removing the fuel pump relay, refer to 8A Electrical Body & Chassis.
4 Start the engine to use any residual fuel from the fuel lines.
4 Disable the ignition coils by removing fuses 34 and 35, refer to 8A Electrical Body & Chassis .
5 Using Tech 2, command the throttle plate to wide open throttle.
Engine Cylinder Compression Test
1 Install the compression tester to cylinder number 1.
2 W hile observing the compression tester reading, turn the ignition to the START position for several seconds and then allow the ignition to return to the ON position.
3 Record the highest compression reading obtained.
4 Repeat the engine compression test for each cylinder.
Test Result Evaluation
Normal engine compression pressure builds quickly and evenly to over 965 kPa. In addition, the lowest reading of an
engine cylinder should not be less than 70 percent of the highest reading. If any cylinder fails the compression test,
adding 15 ml of engine oil to the suspected cylinder may help isolate the following fault condition.
1 A fault condition in the piston rings will produce the following result:
• A low compression on the first engine cycle
• The compression tends to build-up with the succeeding engine rotation.
• The compression improves with the addition of engine oil.
2 A fault condition in an intake or exhaust valve will produce the following result:
• A low compression on the first engine cycle
• The compression does not build with the succeeding engine rotation.
• The compression does not improve with the addition of engine oil.
3 A fault condition in the cylinder head gasket will produce the following result:
• A low compression on the first engine cycle
• The compression does not build with the succeeding engine rotation.
• The compression does not improve with the addition of engine oil.
• The suspected cylinders are positioned adjacent to each other.
• The engine oil may be contaminated with engine coolant.
• The engine coolant may be contaminated with engine oil.
Once the fault has been identified, refer to the relevant service procedure and reinstall the removed components.
Using Tech 2, clear DTCs.

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Engine Mechanical – V6 Page 6A1–39

2.16 Cylinder Leakage Test
A leakage test may be performed to measure cylinder/combustion chamber leakage. High cylinder leakage may indicate
one or more of the following:
• worn or burnt valves,
• broken valve springs,
• stuck valve lifters,
• incorrect valve lash/adjustment,
• damaged piston,
• worn piston rings,
• worn or scored cylinder bore,
• damaged cylinder head gasket,
• cracked or damaged cylinder head, or
• cracked or damaged engine block.

1 Disconnect the battery ground negative cable.
2 Remove the spark plugs from all cylinders, refer to 6C1-3 Engine Management – V6 – Service Operations.
3 Rotate the crankshaft to place the piston in the cylinder being tested at top dead centre (TDC) of the compression stroke.
4 Install a commercially available cylinder head leak down tester into the spark plug hole.
NOTE
If required, hold the crankshaft balancer bolt to
prevent the engine from rotating.
5 Apply shop air pressure to the cylinder head leak down tester and adjust according to the manufacturers instructions.
6 Record the cylinder leakage value. Cylinder leakage that exceeds 25 percent is considered excessive and may require component service. In excessive leakage situations, inspect for the following conditions:
• air leakage sounds at the throttle body or air inlet duct that may indicate a worn or burnt intake valve or a
broken valve spring,
• air leakage sounds at the exhaust system tailpipe that may indicate a worn or burnt exhaust valve or a broken
valve spring,
• air leakage sounds from the crankcase, oil level indicator tube, or oil fill tube that may indicate worn piston
rings, a damaged piston, a worn or scored cylinder bore, a damaged engine block or a damaged cylinder
head, or
• air bubbles in the cooling system may indicate a damaged cylinder head or a damaged cylinder head gasket.
7 Perform the leakage test on the remaining cylinders and record the values.
2.17 Engine Oil Consumption Diagnosis
Definition
Excessive oil consumption (not due to leaks) is the use of 3 litres or more of engine oil within 10,000 kilometres. Prior to
performing oil pressure testing, a preliminary inspection of the vehicle should be performed. During the preliminary visual
inspection, the following likely causes of excessive oil usage should be investigated.
Cause Correction
External oil leaks. Refer to 2.18 Engine Oil Leak Diagnosis.
Incorrect oil level or reading of the oil level indicator. Check for the correct oil level, refer to 3.1 Engine Oil.
Incorrect oil viscosity. Replace the engine oil, using the recommended SAE grade
of engine oil, refer to 3.1 Engine Oil.
Continuous high-speed driving or severe usage. Service vehicle more frequently, refer to 0B Lubrication and
Service.
Crankcase ventilation system restricted or malfunctioning. Repair or replace crankcase ventilation system components as required, refer to 6C1-3 Engine Management – V6 –
Service Operations.

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