2007 ISUZU KB P190 sensor

Engine Cooling – V6 Engine Page 6B1–1

Section 6B1
Engine Cooling – V6
ATTENTION
Before performing any Service Operation or other procedure described in this Section, refer to 1.1 WARNING,
CAUTION and NOTES for correct workshop practices with regard to safety and/or property damage.
1 General Information ............................................................................................................ ...................3
1.1 WARNING, CAUTION and NOTES ..................................................................................................... ................... 4
1.2 Definition of WARNING, CAUTION and NOTE Statements ......................................................................... .. 4
WARNING defined ............................................................................................................................................. 4
CAUTION defined .............................................................................................................................................. 4
NOTE defined..................................................................................................................................................... 4
2 General Description ............................................................................................................ ...................5
2.1 Radiator Assembly .............................................................................................................. .................................. 5
2.2 Cooling Fan – Standard Specification.................................................................................................................. 7
Overview ................................................................................................................................................................. 7
Cooling Fan and Shroud Assembly ................................................................................................ .................... 8
Fan Motor ........................................................................................................................................................... 8
Fan Operation .................................................................................................................. .................................. 8
V6 Cooling Fan Wiring Diagram .................................................................................................. ....................... 9
Fan Assembly connector .................................................................................................................................. 10
2.3 Coolant Pump....................................................................................................................................................... 10
2.4 Coolant Outlet Housing ......................................................................................................... .............................. 11
2.5 Thermostat ........................................................................................................................................................... 11
2.6 Coolant Filler Cap ............................................................................................................. ................................... 13
2.7 Coolant Recovery Reservoir ..................................................................................................... .......................... 14
2.8 Engine Coolant Temperature Sensor .............................................................................................. ................... 15
3 Service Operations ...............................................................................................................................16
3.1 Service Notes ....................................................................................................................................................... 16
Safety .................................................................................................................................................................... 16
Periodic Servicing............................................................................................................. ................................... 16
Environmental Issues ........................................................................................................... ............................... 16
3.2 Coolant Maintenance ........................................................................................................................................... 17
Topping Up the Cooling System.................................................................................................. ....................... 18
Testing Coolant Concentration........................................................................................................................... 18
Method 1 – Refractometer................................................................................................................................ 18
Method 2 – Hydrometer.................................................................................................................................... 21
3.3 Draining and Filling Cooling System ............................................................................................ ..................... 22
Draining ................................................................................................................................................................ 22
Filling .................................................................................................................................................................... 22
3.4 Cleaning Cooling System ........................................................................................................ ............................ 25
Cooling System Reverse Flush ................................................................................................... ....................... 25
Radiator............................................................................................................................................................ 25
Engine .............................................................................................................................................................. 26
Heater Hoses and Core.......................................................................................................... .......................... 27
3.5 Drive Belt Tension ............................................................................................................................................... 28
Inspect .................................................................................................................................................................. 29
3.6 Coolant Hoses ...................................................................................................................................................... 30
3.7 Pressure Testing ............................................................................................................... ................................... 31
Coolant Filler Cap Pressure Testing ............................................................................................ ...................... 31

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Engine Cooling – V6 Engine Page 6B1–15

2.8 Engine Coolant Temperature Sensor
An Engine Coolant Temperature (ECT) sensor (2) is
mounted in the left-hand side cylinder head, just above
the exhaust manifold. The ECT sensor is used in
conjunction with the instrument panel temperature gauge.
The ECT sensor generates a signal, which is used by the
engine management system for calculation of the various
engine management functions.
Figure 6B1 – 13 shows the wiring harness connector (1)
and the ECT sensor (2).
Refer to 6C1-1 Engine Management General Information
for further information on the ECT sensor.

Figure 6B1 – 13

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Engine Cooling – V6 Engine Page 6B1–35

9 To gain easier access to the heater pipe flange and
thermostat housing bolts, disconnect the engine
harness and lay back on the right side of the engine
bay. Apart from those harness connectors removed
during the intake manifold removal, this involves the
removal of wiring harness connectors and fasteners,
as detailed:
a Pull out the release bar (arrows) on each of the ignition coil packs (1) on cylinders 2, 4 and 6,
before disconnecting each connector.
b The coolant temperature sensor.
c The left side Pre-O2 sensor connector, 2, 4 & 6.
NOTE
Refer to 8A – Electrical Body & Chassis for the
location of harness connectors, not shown.

Figure 6B1 –
––
–
34
10 Remove the bolt (1) securing the engine harness ground terminal (2), to the cylinder block.
11 Prise both locking legs of the left side engine harness former (4), free, then lift up on the harness former to
release.

Figure 6B1 –
––
–
35
12 W orking at the rear of the engine, disconnect the engine harness to transmission harness connector (1),
as required.
13 Remove the two bolts (2) securing the engine harness former (3) to the rear of the engine.
14 Carefully lift the engine harness free and drape on the right side of the engine.


NOTE
For further information on removing the
thermostat housing and associated components,
refer to 6A1 Engine Mechanical – V6.
Figure 6B1 –
––
–
36

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Engine Cooling – V6 Engine Page 6B1–62


Refer to 3.1 Service Notes in this Section, for
important safety items before removing the
coolant filler pressure cap or servicing the
system.

The cooling system is designed to operate at
120 –
––
–
130 kPa and a maximum temperature
not above 130 °
°°
°
C.
Cooling System Diagnosis
Step Action Result Yes No
1
Check Temperature gauge reading High Temp.
Low Temp. Go to Step 2
Go to Step 6 –
2
Check drive belt condition and tension. Refer to 6A1
Engine Mechanical. To Specification Go to Step 3 Replace drive
belt or
tensioner.
3 Check coolant Boiling Go to Step 4 Go to Step 5
4 Check coolant level. Refer to 3.2 Coolant
Maintenance in this Section. Low Go to Step 10 Go to Step 6
5
Check coolant filler cap. Refer to 3.7 Pressure
Testing – Coolant Filler Cap Pressure Testing in this
Section OK? Go to Step 8
Replace
Coolant filler
cap
6 Check thermostat. Refer to 3.8 Thermostat in this
Section. OK? Go to Step 9 Go to Step 13
7
Check Engine Coolant Temperature (ECT) sensor.
Refer to 6C1 Engine Management General Information. Faulty Replace Go to Step 12
8
Check cooling fan operation. Refer to 6C1 Engine
Management General Information. Operational Go to Step 10 Repair
9
Check for collapsed upper or lower radiator hose. Collapsed Replace Go to Step 13
10 Visual system check Leaks Go to Step 13 Go to Step 11
11 Check coolant concentration. Refer to 3.2 Coolant
Maintenance. To Specification Go to Step 12 Correct
Concentration Level
12 Check radiator core for bent fins, dirt, bugs or other
obstructions. Obstructed Clean or
straighten Go to Step 14
13
Pressure Test cooling system. Refer to 3.7 Pressure
Testing in this Section. Leaks Repair System OK
14
If none of the above require repair, the problem is
complex or of a major nature.
Refer to 4.5 Problems Not Requiring Disassembly of
Cooling System or 4.6 Problems Requiring Disassembly
of Cooling System. – – –

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Engine Management – V6 – General Information Page 6C1-1–2

3.9 Serial Data Communication System ................................................................................................................... 17
3.10 Self Diagnostics System ..................................................................................................................................... 17
3.11 Service Programming System ..................................................................................................... ....................... 17
3.12 Immobiliser System ............................................................................................................................................. 18
4 Component Description and Operation ............................................................................................ .19
4.1 A/C Refrigerant Pressure Sensor ....................................................................................................................... 19
4.2 Brake Pedal Switch Assembly ............................................................................................................................ 19
Stop Lamp and Initial Brake Apply Switch ....................................................................................... ................. 19
Stop Lamp Switch ............................................................................................................................................ 19
Initial Brake Apply Switch ..................................................................................................... ............................ 19
4.3 Barometric Pressure Sensor..................................................................................................... .......................... 20
4.4 Camshaft Position Sensor .................................................................................................................................. 20
4.5 Crankshaft Position Sensor ................................................................................................................................ 21
4.6 Clutch Pedal Switch Assembly – Manual Vehicles Only ............................................................................ ...... 22
4.7 Engine Control Module........................................................................................................................................ 22
4.8 Engine Coolant Temperature Sensor .............................................................................................. ................... 23
4.9 Electric Cooling Fans .......................................................................................................................................... 23
4.10 Engine Oil Level and Temperature Sensor ........................................................................................ ................ 24
Engine Oil Temperature Sensor ......................................................................................................................... 24
Engine Oil Level Sensor ...................................................................................................................................... 25
4.11 Engine Oil Pressure Sensor..................................................................................................... ........................... 25
4.12 Fuel Injectors........................................................................................................................................................ 26
4.13 Fuel Rail Assembly ............................................................................................................. ................................. 27
4.14 Heated Oxygen Sensors .......................................................................................................... ............................ 27
LSF 4.2 Two-step Planar Heated Oxygen Sensors .................................................................................. ......... 27
LSU 4.2 Wide-band Planar Heated Oxygen Sensors ................................................................................. ....... 29
4.15 Ignition Coil and Spark Plug ............................................................................................................................... 31
4.16 Intake Air Temperature Sensor .................................................................................................. ......................... 32
4.17 Knock Sensor ....................................................................................................................................................... 32
4.18 Mass Air Flow Sensor........................................................................................................... ............................... 33
Air Intake System ................................................................................................................................................. 33
Mass Air Flow Sensor........................................................................................................... ............................... 33
Construction ..................................................................................................................................................... 34
Operation ......................................................................................................................................................... 34
5 Abbreviations and Glossary of Terms ............................................................................................ ...35

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Engine Management – V6 – General Information Page 6C1-1–3

1 General Information

The V6 engine management system
incorporates functions and components that
could cause personal injury or vehicle
damage. Refer to 6C1-2 Engine Management –
V6 – Diagnostics, and 6C1-3 Engine
Management – V6 – Service Operations,
before attempting any diagnosis or repairs.
1.1 Introduction
The V6 engine management system is designed to improve engine performance and increase vehicle safety while
meeting the stringent Euro 3 vehicle emission standard. This is achieved by the introduction of the following engine
management sub-systems and components:
• Throttle actuator control (TAC) System – the TAC system allows the engine control module (ECM) to electronically
control the throttle plate opening eliminating the need for the following components:
• mechanical link between the throttle plate and accelerator pedal,
• cruise control module, and
• idle air control motor.
Refer to 3.5 Throttle Actuator Control System for details of the TAC System operation and to 3.6 Cruise Control System for details of the cruise control operation.
This feature results in improved driveability, better fuel economy and emission control.
• W ide band heated oxygen sensor provides a more accurate measurement of the oxygen concentration in the
exhaust gas. Refer to 4.14 Heated Oxygen Sensors.
• Dual spray fuel injectors are now used. The use of this spray pattern is used in engines with two intake valves per
cylinder. The dual spray is achieved by having two openings in the spray orifice disc that are arranged in such a
way that two fuel sprays result, being aimed at each intake valve port. Refer to 4.12 Fuel Injectors.
• Pencil Coil – allows the ignition coil to be fitted directly on the spark plug eliminating the need for spark plug wires.
Refer to 4.15 Ignition Coil and Spark Plug.
The engine management system has a self diagnostic capability, as well as connections to enable diagnosis of faults. If
the ECM recognises operational problems it can alert the driver via the malfunction indicator lamp (MIL) in the instrument
cluster. The ECM also interfaces with other systems in the vehicle as required.
For further information on the air-conditioning system refer to 2A Heater and Air-conditioning,
For the location of fuses, fusible links and relays, refer to 8A Electrical-Body and Chassis.
1.2 Emission Control
ADR 79/01 Emissions Standards
MY2006 I190 Rodeo has been configured to comply with Australian Design Rule 79/01, that adopts the technical
requirements of the European Council Directive 98/69/EC. Commonly referred to as “Euro 3”, the new legislation
modifies the exhaust emissions, compared to the existing ADR 37/01 (or ‘Euro 2’) vehicle emissions standards.
Australian Design Rule 79/01 implements the 'Euro 3' exhaust and evaporative emissions requirements for petrol fuelled
passenger cars, forward control vehicles and passenger off-road vehicles with a gross vehicle mass (GVM) up to 3.5
tonnes. All new vehicles within these categories and first registered from January 1, 2006 must comply with ADR 79/01.
The next table shows a comparison between the existing ADR 37/01 (‘Euro 2’) and ADR 79/01 (‘Euro 3’) Hydrocarbons
Carbon
Monoxide (g/km) Exhaust
(g/km) Evaporative
(g/test) Oxides of Nitrogen
(g/km) Particulate
Matter (g/test)

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Engine Management – V6 – General Information Page 6C1-1–5

2 Component Locations
2.1 Cylinder Numbering
Engine cylinder identification follows the international
standard OBD II. This standard calls for the engine cylinder
bank number one to be identified by the location of cylinder
number one. Therefore the numbering for the V6 engine is:
The V6 engine cylinders are numbered as follows:
• 1, 3, 5 – Right-hand side (Bank 1),
• 2, 4, 6 – Left-hand side (Bank 2).
The engine firing order is 1, 2, 3, 4, 5, 6.

Figure 6C1-1 – 1
2.2 Engine Compartment
Legend
1 Mass Air Flow (MAF) Sensor 2 Air-conditioner Refrigerant Pressure Sensor
Figure 6C1-1 – 2

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

2.3 Engine

Figure 6C1-1 – 3
Legend
1 Barometric Pressure (BARO) Sensor
2 Ignition Coil Assembly (six places)
3 Spark Plug (six places)
4 Throttle Body Assembly 5 Engine Control Module (ECM)
6 Crankshaft Position (CKP) Sensor
7 Heated Oxygen Sensor (HO2S), Pre-Catalyst (two places)
8 Heated Oxygen Sensor (HO2S), Post-Catalyst (two places)

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