2007 ISUZU KB P190 engine mount

6E-286 Engine Control System (4JH1)
Exhaust Gas Recirculation (EGR) Solenoid Valve



RTW 76ESH003601
The engine control module (ECM) controls the exhaust
gas recirculation (EGR) flow amount based on the
engine speed, engine coolant temperature, intake ai
r
temperature, barometric pressure and fuel injection
quantity. The ECM controls the EGR valve b
y
controlling the EGR solenoid valve. The mass air flo
w
(MAF) sensor monitors EGR gas flow amount. An
expected MAF amount should be detected while the
engine running.

Intake Air Temperature (IAT) Sensor



RTW 66ESH001701
The intake air temperature (IAT) sensor is fitted
between the air cleaner and turbocharger internal to the
mass air flow (MAF) sensor. The IAT sensor is a
variable resistor. The IAT sensor measures the
temperature of the air entering the engine. The engine
control module (ECM) supplies 5 volts to the IAT signal
circuit and a ground for the IAT low reference circuit.
W hen the IAT sensor is cold, the sensor resistance is
high. W hen the air temperature increases, the senso
r
resistance decreases. W ith high sensor resistance, the
ECM detects a high voltage on the IAT signal circuit.
W ith lower sensor resistance, the ECM detects a lowe
r
voltage on the IAT signal circuit.
Mass Air Flow (MAF) Sensor



RTW 66ESH001701
The mass air flow (MAF) sensor is an air flow meter that
measures the amount of air that enters the engine. It is
fitted between the air cleaner and turbocharger. A small
quantity of air that enters the engine indicates
deceleration or idle. A large quantity of air that enters
the engine indicates acceleration or a high load
condition. The MAF sensor assembly consists of a MAF
sensor element and an intake air temperature senso
r
that are both exposed to the air flow to be measured.
The MAF sensor element measures the partial air mass
through a measurement duct on the sensor housing.



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ISUZU KB P190 2007

Engine Control System (4JH1) 6E-295
The timing control valve (TCV) acts as a variable
throttle, using the rapid opening and closing (cycling)
of the valve needle in the TCV.
At normal operation,
the TCV controls the pressure acting on the annula
r
chamber so that the hydraulic stopper cam move to
any position, from the retard position to the advance
position. At this time, the duty ratio is set by the fuel
injection pump control unit (PCU).

When control current flows to the TCV coil, the valve
needle opens and the fuel annular chamber flows
through the orifice to the feed pump inlet.
Consequently, the pressure of the annular chambe
r
decreases and the hydraulic stopper is moved to the
retard side.

When control current to the TCV coil is cut, the valve
needle closes and the return passage is closed.
Consequently, the pressure of the annular chambe
r
increases and the hydraulic stopper is moved to the
advance side.

Pump Camshaft Position (CMP) Sensor



RTW 66ESH003301
Legend
1. Pump Camshaft Position (CMP) Sensor
2. Flexible Connecting Harness
3. Drive Shaft
4. Pump Camshaft Position (CMP) Sensor Retaining Ring
5. Sensor W heel


W hen the drive shaft rotates, the pump camshaft
position (CMP) sensor receives signal form the senso
r
wheel, and an electric pulse is sent through the flexible
connecting harness to the fuel injection pump control
unit (PCU). From these signals the PCU can determine
the average pump speed and the momentary pump
speed. The pump CMP sensor is mounted to the cam
ring. Thus, the relationship between the cam ring and
the pump CMP sensor signal is constant. The pump
CMP sensor signal is utilized for the following purposes:
• To determine the momentary angular position o
f
the cam ring.
• To calculate the actual speed of the fuel injection
pump.
• To determine the actual timing plunger position.




RTW 66ESH003401Legend
1. Pump Camshaft Position (CMP) Sensor Signal
2. Crankshaft Position (CKP) Sensor Signal
3. Fuel Injection Solenoid Valve Control Pulse
4. Fuel Injection Solenoid Needle Valve Lift
5. Cam Lift (Cam Profile)
6. Pulse Count
7. Fuel Injection Solenoid Valve Close
8. Fuel Injection Solenoid Valve Open
9. Start of Pressure Delivery
10. End of Pressure Delivery
11. Pressure Delivery Angle
12. Effective Stroke






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ISUZU KB P190 2007

Engine Control System (4JH1) 6E-297
Exhaust Gas Recirculation (EGR) System Description





RTW 66ELF000101
Legend
1. EGR Cooler
2. Engine Coolant Outlet
3. Engine Coolant Inlet
4. EGR Valve


5. ECM
6. MAF & IAT Sensor
7. Intake Throttle Valve
The EGR system recirculates a part of exhaust gas
back into the intake manifold, which results in reducing
nitrogen oxide (NOx) emissions. The EGR control
system uses an electronic control system solenoid valve
and vacuum control EGR valve to ensure both
driveability and low emission. The engine control
module (ECM) controls the EGR flow amount based on
the engine speed, engine coolant temperature, intake
air temperature, barometric pressure and fuel injection
quantity. The ECM controls the EGR valve opening b
y
controlling the EGR solenoid valve drive duty. The mass
air flow (MAF) sensor monitors EGR gas flow amount.
An expected MAF amount should be detected while the
engine running.

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ISUZU KB P190 2007

6E-298 Engine Control System (4JH1)
Turbocharger Description






RTW 66EMF000501
Legend
1. Exhaust Gas
2. W astegate Valve
3. Turbine W heel
4. Compressor W heel
5. Air Cleaner


6. Vacuum Pressure Sensor
7. Engine Control Module (ECM)
8. Turbocharger Solenoid Valve
9. Vacuum Pump (ACG)
10. Change Air Cooler (Intercooler)
The turbocharger is used to increase the amount of ai
r
that enters the engine cylinders. This allows a
proportional increase of fuel to be injected into the
cylinders, resulting in increased power output, more
complete combustion of fuel, and increased cooling o
f
the cylinder heads, pistons, valves, and exhaust gas.
This cooling effect helps extend engine life.
Heat energy and pressures in the engine exhaust gas
are utilized to drive the turbine. Exhaust gas is directed
to the turbine housing. The turbine housing acts as a
nozzle to direct the shaft wheel assembly. Since the
compressor wheel is attached directly to the shaft, the
compressor wheel rotates at the same speed as the
turbine wheel. Clean air from the air cleaner is drawn
into the compressor housing and wheel. The air is
compressed and delivered through a crossover pipe to
the engine air intake manifold, then into the cylinders.
The amount of air pressure rise and air volume
delivered to the engine from the compressor outlet is
regulated by a wastegate valve in the exhaust housing.
The position of the wastegate valve is controlled by the
amount of pressure built up on the intake side of the
turbocharger. The diaphragm on the inside of the
wastegate is pressure sensitive, and controls the
position of the valve inside the turbocharger. The
position of the valve will increase or decrease the
amount of boost to the turbocharger.
The charge air cooler also helps the performance of the
diesel. Intake air is drawn through the air cleaner and
into the turbocharger compressor housing. Pressurized
air from the turbocharger then flows forward through the
charge air cooler located in the front of the radiator.
From the charge air cooler, the air flows back into the
intake manifold.
The charge air cooler is a heat exchanger that uses ai
r
flow to dissipate heat from the intake air. As the
turbocharger increases air pressure, the air temperature
increases. Lowering the intake air temperature
increases the engine efficiency and power by packing
more air molecules into the same space.


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ISUZU KB P190 2007

EXHAUST SYSTEM 6F – 7

GENERAL DESCRIPTION
This system controls the formation of NOx emission by recirculating the exhaust gas into the combustion chamber
through the intake manifold.

4JA1T(L):
The two EGR valves are controlled by two Vacuum Switching Valve (VSV) controlled by EGR controller according to
signals from various sensors.
The amount of EGR depends on the number of engine rotations and the opening of the accelerator.







RTW 46ELF001201



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ISUZU KB P190 2007

ENGINE MECHANICAL (4JK1/4JJ1) 6A-1
SECTION 6A
ENGINE MECHANICAL (4JK1/4JJ1)
TABLE OF CONTENTS

ISUZU DIESEL ENGINE (4JK1/4JJ1) ................ 6A-3
Service Precautions ........................................ 6A-3
Trouble Shooting ............................................. 6A-8
Main Data and Specifications .......................... 6A-13
Special Tools ................................................... 6A-14
Engine Assembly................................................ 6A-15 Removal .......................................................... 6A-15
Installation ....................................................... 6A-17
Special Tools ................................................... 6A-19
Engine Mount ..................................................... 6A-20 Components .................................................... 6A-20
Removal .......................................................... 6A-21
Installation ....................................................... 6A-21
Torque Specifications...................................... 6A-22
Special Tools ................................................... 6A-22
Cylinder Head Cover .......................................... 6A-23 Components .................................................... 6A-23
Removal .......................................................... 6A-24
Installation ....................................................... 6A-25
Intake Manifold ................................................... 6A-27 Components (Standard Output) ...................... 6A-27
Components (High Output) ............................. 6A-28
Removal .......................................................... 6A-29
Installation ....................................................... 6A-31
Torque Specifications...................................... 6A-32
Turbocharger and Exhaust Manifold (Standard Output) ........................................... 6A-33
Components .................................................... 6A-33
Removal .......................................................... 6A-34
Inspection ........................................................ 6A-36
Installation ....................................................... 6A-37
Torque Specifications...................................... 6A-40
Turbocharger (High Output) ............................... 6A-41 Components .................................................... 6A-41
Removal .......................................................... 6A-42
Inspection ........................................................ 6A-43
Installation ....................................................... 6A-44
Torque Specifications...................................... 6A-45
Exhaust Manifold (High Output) ......................... 6A-46 Components .................................................... 6A-46
Removal .......................................................... 6A-47
Inspection ........................................................ 6A-47
Installation ....................................................... 6A-47
Torque Specifications...................................... 6A-49
Timing Gear Train .............................................. 6A-50 Components .................................................... 6A-50
Removal .......................................................... 6A-51
Disassembly .................................................... 6A-53
Reassembly .................................................... 6A-53
Inspection ........................................................ 6A-54
Installation ....................................................... 6A-55
Torque Specifications...................................... 6A-58
Camshaft Assembly ........................................... 6A-59 Components .................................................... 6A-59
Removal .......................................................... 6A-60
Disassembly .................................................... 6A-61
Reassembly .................................................... 6A-63
Installation ....................................................... 6A-64
Torque Specifications...................................... 6A-66
Special Tools................................................... 6A-66
Valve Stem Seal and Valve Spring .................... 6A-67 Components .................................................... 6A-67
Removal .......................................................... 6A-68
Inspection ........................................................ 6A-69
Installation ....................................................... 6A-70
Special Tools................................................... 6A-71
Cylinder Head..................................................... 6A-72 Components .................................................... 6A-72
Removal .......................................................... 6A-72
Disassembly .................................................... 6A-81
Inspection ........................................................ 6A-83
Reassembly .................................................... 6A-87
Installation ....................................................... 6A-89
Torque Specifications...................................... 6A-100
Special Tools................................................... 6A-100
Piston and Connecting Rod................................ 6A-101 Components .................................................... 6A-101
Removal .......................................................... 6A-101
Disassembly .................................................... 6A-102
Reassembly .................................................... 6A-107
Installation ....................................................... 6A-108
Torque Specifications...................................... 6A-110

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ENGINE MECHANICAL (4JK1/4JJ1) 6A-17



RTW 56ASH004401
Legend
1. Engine Hanger (Rear Side)

27.Hang wire on the engine hanger and hoist to lift up
the engine slightly.
28.Remove the engine mount.
• Remove the fastening bolts for the engine mount
on the engine side.
29.Remove the engine assembly.
• Hoist the engine slightly to provide space to
remove the catalytic converter.
Installation
Notice:
Be absolutely sure that each harness is reconnected to
its original position.
1. Install the engine assembly.
• Hang wire on the engine hanger and hoist to lift up
the engine.
• Operate a hoist slowly to move the engine to the
place where it is to be installed.
• Make the transmission side lower and operate a
hoist slowly, pulling it backward to the engine.
2. Install the engine mount.
Tightening torque: 48 N ⋅
⋅⋅
⋅
m (4.9kg ⋅
⋅⋅
⋅
m / 35 lb ft)
3. Remove the engine hanger.
4. Install the catalytic converter.
Tightening torque: 27 N ⋅
⋅⋅
⋅
m (2.8kg ⋅
⋅⋅
⋅
m /20 lb ft)
5. Install the front exhaust pipe. Tightening torque: 67 N ⋅
⋅⋅
⋅
m (6.8kg ⋅
⋅⋅
⋅
m / 49 lb ft)
6. Install the fuel hose on the feed and return sides.
7. Install the vacuum hose of brake master-vac.
8. Install the connector of the shift on the fly (4 ×4).
9. Install the harness of engine, battery and earth to the body side.
10.Install the power steering pump.
Tightening torque: 25 N ⋅
⋅⋅
⋅
m (2.5kg ⋅
⋅⋅
⋅
m / 18 lb ft)
• Install the bracket of power steering oil hose.
11.Install the A/C compressor.
Tightening torque: 25 N ⋅
⋅⋅
⋅
m (2.5kg ⋅
⋅⋅
⋅
m / 18 lb ft)
• Install the connector.
12.Install the A/C generator harness.
• Install the terminal B cable and the harness
connector to the generator.
13.Install the radiator.
Tightening torque: 25 N ⋅
⋅⋅
⋅
m (2.5kg ⋅
⋅⋅
⋅
m / 18 lb ft)
14.Install the fan assembly. Tightening torque: 8 N ⋅
⋅⋅
⋅
m (0.8kg ⋅
⋅⋅
⋅
m / 69 lb in)
15.Install the drive belt.
Refer to removal procedure for drive belt in this manual.
16.Install the fan guide.
17.Install the breather hose and lower hose of the radiator.
18.Install the engine harness clip (1).

RTW 76ASH001401
19.Install the radiator upper hose.
20.Install the intake hose (turbocharger -intercooler) (Standard output).
• Install the harness connector.


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6A-20 ENGINE MECHANICAL (4JK1/4JJ1)
Engine Mount
Components




RTW 56ALF001801
Legend 1. Nut
2. Bolt (L = 80 mm / 3.15 in)
3. Bolt (L = 30 mm / 1.18 in)
4. Bolt (L = 30 mm / 1.18 in)
5. Engine Foot RH
6. Engine Mount RH
7. Bolt (L = 25 mm / 0.98 in) 8. Bolt (L = 45 mm / 1.77 in)
9. Bolt (L = 30 mm / 1.18 in)
10. Bolt (L = 40 mm / 1.57 in)
11. Bolt (L = 20 mm / 0.78 in)
12. Bolt (L = 100 mm / 3.94 in)
13. Engine Foot LH
14. Engine Mount LH


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