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Make/Model Information:

  • Brand:   Denso
  • Models included:
    • Denso Common Rail for Isuzu Forward 6HK1 Engine
    • Denso Common Rail for Isuzu Forward 6SD1 Engine
    • Denso Common Rail for Isuzu Forward 6WG1 Engine

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   157
  • File size:  ∼ 6.90 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   ENDE-0007

NOTE:  This list was created by program script and may not accurately represent the text from the source pages.   For full preview please click on 'Download sample':

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June, 2003
Diesel Injection Pump
Common Rail System for ISUZU
Operation
No. E-03-02
SERVICE MANUAL
6HK1/6SD1 Type Engine
00400018
For DENSO Authorized
ECD Service Dealer Only
GENERAL
The common rail system was designed for electronic control of injection quantity, injection tim-
ing and injection pressure to obtain optimal operational control.
Features
Lower exhaust gas and higher output due to high pressure injection in all usage ranges.
Reduction in noise and exhaust gas due to injection rate control.
Improved performance due to increased flexibility in the injection timing setting.
Independent control of injection pressure in response to engine speed and load.
Main Elements
Manufacturer Vehicle Model Engine Model Cylinder
Configuration
Total
Displacement
ISUZU Forward
Straight 6
6SD1 9,800
6WG1 15,600
1. Outline
1.1 System Outline
This system also provides the following functions:
A self-diagnosis and alarm function using computer to diagnose the system’s major
components and alert the driver in the event of a problem.
A fail-safe function to stop the engine, depending upon the location of the problem.
A backup function to change the fuel regulation method, thus enabling the vehicle to
continue operation.
1.2 System Configuration
Divided by function, the system can be classified according to the fuel system and the control
system.
[1] Fuel System
High-pressure fuel that is generated by the supply pump is distributed to the cylinders using a
rail. Electromagnetic valves in the injectors then open and close the nozzle needle valve to con-
trol the start and end of fuel injection.
[2] Control System
Based on the signals received from various sensors mounted on the engine and the vehicle,
the ECU controls current timing and the duration in which the current is applied to the injectors,
thus ensuring an optimal amount of fuel is injected at an optimal time.
The control system can be broadly classified according to the following electronic components:
sensors, computers, and actuators.
Fuel tank Supply pump Rail
Electronic
control
Injector
Discharge
volume
Solenoid valve to control
the needle lift
Q000080E
Sensors Computers Actuators
Accelerator sensor Injectors
Supply pump Other sensors and switches
NE sensor
(Crankshaft position sensor)
TDC sensor
(Cylinder recognition sensor)
(Accelerator opening)
(Engine speed)
Cylinder
recognition signal
Fuel injection quantity
and injection timing control etc.
(Fuel pressure control)
ECU ( )
Q000081E
Diesel Injection Pump
COMMON RAIL SYSTEM (CRS)
OPERATION
September, 2007
00400534E
SERVICE MANUAL
Table of Contents
Table of Contents
Operation Section
1. GENERAL DESCRIPTION
1.1 Changes In Environment Surrounding The Diesel Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 Demands On Fuel Injection System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.3 Types Of And Transitions In ECD (ELECTRONICALLY CONTROLLED DIESEL) Systems . . . . . . . . . . . . . . 1-3
1.4 Common Rail System Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.5 Common Rail System And Supply Pump Transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
1.6 Injector Transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
1.7 Common Rail System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2. COMMON RAIL SYSTEM OUTLINE
2.1 Layout of Main Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3. SUPPLY PUMP DESCRIPTION
3.1 HP0 Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
3.2 HP2 Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
3.3 HP3 Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
3.4 HP4 Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41
4. RAIL DESCCRIPTION
4.1 Rail Functions and Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-46
4.2 Component Part Construction and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-46
5. INJECTOR DESCRIPTION
5.1 General Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-50
5.2 Injector Construction and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-51
5.3 Injector Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54
5.4 Injector Actuation Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54
5.5 Other Injector Component Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-56
6. DESCRIPTION OF CONTROL SYSTEM COMPONENTS
6.1 Engine Control System Diagram (Reference) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-59
6.2 Engine ECU (Electronic Control Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-60
6.3 EDU (Electronic Driving Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-60
6.4 Various Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-61
7. CONTROL SYSTEM
7.1 Fuel Injection Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-66
7.2 E-EGR System (Electric-Exhaust Gas Recirculation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-76
7.3 Electronically Controlled Throttle (Not Made By DENSO). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-78
7.4 Exhaust Gas Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-79
7.5 DPF System (Diesel Particulate Filter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-80
7.6 DPNR SYSTEM (DIESEL PARTICULATE NOx REDUCTION). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-82
Table of Contents
8. DIAGNOSIS
8.1 Outline Of The Diagnostic Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-83
8.2 Diagnosis Inspection Using DST-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-83
8.3 Diagnosis Inspection Using The MIL (Malfunction Indicator Light) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-84
8.4 Throttle Body Function Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-86
9. END OF VOLUME MATERIALS
9.1 Particulate Matter (PM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-87
9.2 Common Rail Type Fuel Injection System Development History And The World’s Manufacturers. . . . . . . . . 1-87
9.3 Higher Injection Pressure, Optimized Injection Rates, Higher Injection Timing Control Precision, Higher Injection
Quantity Control Precision. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-88
9.4 Image Of Combustion Chamber Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-90
Repair Section
1. DIESEL ENGINE MALFUNCTIONS AND DIAGNOSTIC METHODS (BASIC KNOWL-
1.1 Combustion State and Malfunction Cause . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-91
1.2 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-92
2. DIAGNOSIS OVERVIEW
2.1 Diagnostic Work Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-93
2.2 Inquiries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94
2.3 Non-Reoccurring Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96
3. DTC READING (FOR TOYOTA VEHICLES)
3.1 DST-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-98
3.2 DTC Check (Code Reading via the DST-2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-98
3.3 DTC Memory Erasure (via the DST-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-98
4. TROUBLESHOOTING BY SYSTEM
4.1 Intake System Diagnosis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-99
4.2 Fuel System Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-99
4.3 Basics of Electrical/Electronic Circuit Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-102
5. TROUBLESHOOTING
5.1 Troubleshooting According to Malfunction Symptom (for TOYOTA Vehicles). . . . . . . . . . . . . . . . . . . . . . . . 2-107
5.2 Other Malfunction Symptoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-122
6. DIAGNOSIS CODES (DTC)
6.1 DTC Chart (Example) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-124


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