Isuzu N-Series. Manual — part 655
6E-42 Engine Control System (4HK1)
Reading Diagnostic Trouble Codes (DTCs) with The
Tech 2
The procedure for reading DTC(s) is used a diagnostic
Tech 2. To read DTCs, use the Tech 2 “Read DTC Info
As Stored By ECU”.
Clearing Diagnostic Trouble Codes (DTCs) with The
Tech 2 or without Tech 2
Do not clear DTCs unless directed to do so by the
service information provided for each diagnostic
procedure. To clear DTCs, use with the Tech 2 “Clear
DTC Information”. If there is no Tech 2, clear with
accelerator pedal operation.
Notice:
A history DTC clears after 20 consecutive driving
cycles without a fault.
DTC Clear Method with Accelerator Pedal Operation
1. Turn ON the ignition, with the engine OFF.
2. Use a jumper wire and the DLC terminal “1”
(diagnostic request) is pulled “Low” (grounded) by
jumped to DLC terminal “4”.
3. Depress accelerator pedal within 1 – 3 seconds.
4. Release accelerator pedal within 1 – 3 seconds.
5. Depress accelerator pedal within 1 – 3 seconds.
6. Release accelerator pedal within 1 – 3 seconds.
7. Depress accelerator pedal within 1 – 3 seconds.
8. Release accelerator pedal within 1 – 3 seconds.
Notice:
DO NOT touch the accelerator pedal when it is
released.
Tech 2 Scan Tool
Isuzu recommend using Tech 2. Refer to the Tech 2
Users Guide for proper start up procedures.
Operating Procedure
1. Press Enter at start screen.
2. Select Diagnostic > appropriate vehicle
identification > Engine > 4HK1(Common Rail).
3. The following table shows, which functions are
used the available equipment versions.
N6A6472E
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F0: Diagnostic Trouble Codes
F0: Read DTC Info As Stored By ECU
F1: Clear DTC Information
F1: Data Display
F2: Snapshot
F3: Actuator Test
F0: Fuel System
F0: Rail Pressure Control
F1: Injector Balancing
F2: Injection Timing
F3: Pre Injection Stop
F4: Injector Forced Drive
F1: Device Controls
F0: Glow Plug Relay
F1: Exhaust Brake Control
F2: EGR Control
F4: Programming
F0: Injector ID Code
F0: Injector ID Code
F1: ID Code Registration
F2: Upload ID Code
F3: Download ID Code
N6A6473E
Engine Control System (4HK1) 6E-43
F0: Diagnostic Trouble Codes
The purpose of this mode is to display stored trouble
code in the ECM. When “Clear DTC Information” is
selected, “Clear DTC Information”, warning screen
appears. This screen informs you that by cleaning
DTCs “all stored DTC information in the ECM will be
erased”.
F1: Data Display
The purpose of this mode is to continuously monitor
data parameters. The current actual values of all
important sensors and signals, solenoid commands in
the system are display through this mode.
Refer to the Tech 2 Data List in this section.
F2: Snapshot
“Snapshot” allow you to focus on making the condition
occur, rather than trying to view all of the data in
anticipation of the fault. The snapshot will collect
parameter information around a trigger point that you
select.
Refer to the Tech 2 user instructions for more
information.
F3: Actuator Test
The purpose of this mode is to check for correct
operation of electronic system actuators. Using
actuator test menus can test the state of each actuator
and related sensors. Especially when DTC cannot be
detected, a faulty circuit can be diagnosed by testing.
Even DTC has been detected, the circuit tests using
these menus could help discriminate between a
mechanical trouble and an electrical trouble.
Refer to the Tech 2 Output Controls in this section.
F4: Programming
The purpose of this mode is to program the fuel injector
ID code into the ECM if the fuel injector or ECM is to be
replaced.
Tech 2 Data List
The Tech 2 Data List contains all engine related
parameters that are available on the Tech 2. Use the
Tech 2 Data List only after the following is determined:
• The Diagnostic System Check – Engine Controls
is completed.
• No diagnostic trouble codes (DTCs) are present.
• On-board diagnostics are functioning properly.
Tech 2 values from a properly running engine may be
used for comparison with the engine you are
diagnosing. The Tech 2 Data List represents values
that would be seen on a normal running engine.
Important:
A Tech 2 that displays faulty data should not be used.
The Tech 2 problem should be reported to the
manufacturer. Use of a faulty Tech 2 can result in
misdiagnosis and unnecessary parts replacement.
Only the parameters listed below are referenced in this
service manual for use in diagnosis.
Tech 2 Parameter
Units Displayed
Typical Data Value at
Engine Idle
Typical Data Value at 1600
RPM
Operating Conditions: Engine Idling or 1600 RPM / Engine Coolant Temperature is between 75-85
°C (167-185°F) / Accelerator
Pedal is Constant / Neutral / Accessories OFF / Vehicle Located at Sea Level
Ignition Voltage
V
22.0 – 30.0
22.0 – 30.0
Battery Voltage
V
22.0 – 30.0
22.0 – 30.0
Desired Idle Speed
RPM
650
650
Engine Speed
RPM
600 – 700
1550 – 1650
APP Sensor 1 (Accelerator Pedal Position)
V
0.3 – 0.7
1.2 – 1.6
APP Sensor 2 (Accelerator Pedal Position)
V
4.1 – 4.5
3.4 – 3.8
Accelerator Pedal Position (APP) Angle
%
0
20 – 26
Differential Fuel Rail Pressure
MPa / psi
-5 – 5 MPa / -725 – 725 psi -5 – 5 MPa / -725 – 725 psi
Fuel Rail Pressure Sensor
V
1.4 – 1.6
More than 2.0 volts
Rail Pressure Feedback
Shutoff Mode /
Wait Mode /
Feedback Mode
Feedback Mode
Feedback Mode
Fuel Rail Pressure (FRP) Regulator Command
%
35 – 45
30 – 40
FRP Regulator Feedback
mA
900 – 1300
800 – 1200
Coolant Temperature Sensor
V
0.4 – 0.6
0.4 – 0.6
6E-44 Engine Control System (4HK1)
Coolant Temperature
°C / °F
75 – 85
°C / 167 – 185°F
75 – 85
°C / 167 – 185°F
Intake Air Temperature Sensor
V
1.1 – 2.1
1.1 – 2.1
Intake Air Temperature
°C / °F
20 – 40
°C / 68 – 104°F
20 – 40
°C / 68 – 104°F
Fuel Temperature Sensor
V
2.4 – 2.8
2.4 – 2.8
Fuel Temperature
°C / °F
20 – 50
°C / 50 – 122°F
20 – 50
°C / 50 – 122°F
Barometric Pressure Sensor
V
Nearly 2.3 volts at sea
level
Nearly 2.3 volts at sea
level
Barometric Pressure
KPa / psi
Nearly 100 KPa / 14.5 psi
at sea level
Nearly 100 KPa / 14.5 psi
at sea level
EGR Position Sensor
V
Less than 1.5 volts
Less than 2.0 volts
EGR Position Variance
%
-5 – 5%
-5 – 5%
EGR Solenoid Command
%
Less than 20%
Less than 30%
Boost Pressure Sensor
V
Nearly 1.0 volt at sea level
Less than 1.3 volts at sea
level
Boost Pressure
KPa / psi
Nearly 100 KPa / 14.5 psi
at sea level
Less than 115 KPa / 16.7
psi at sea level
ASR System Command APP Angle
%
100
100
Vehicle Speed
Km/h / MPH
0
0
Cylinder 1 Compensation
mm
3
/st
-5.0 – 5.0 (Varies)
0.0
Cylinder 2 Compensation
mm
3
/st
-5.0 – 5.0 (Varies)
0.0
Cylinder 3 Compensation
mm
3
/st
-5.0 – 5.0 (Varies)
0.0
Cylinder 4 Compensation
mm
3
/st
-5.0 – 5.0 (Varies)
0.0
Engine Mode
Halt Mode / Wait
Mode / Crank
Mode / Fuel Mode
Fuel Mode
Fuel Mode
Engine Warm Up Switch
On / Off
Off
Off
Ignition Switch
On / Off
On
On
Starter Switch
On / Off
Off
Off
Clutch Pedal Switch
Applied / Release
Released
Released
Park / Neutral Switch
On / Off
On
On
Parking Brake Switch
Applied / Released
Applied
Applied
Exhaust Brake Switch
On / Off
Off
Off
Exhaust Brake Solenoid Valve Command
On / Off
Off
Off
PTO Switch
On / Off
Off
Off
PTO Remote Throttle Angle
%
0
0
PTO Remote Throttle Sensor
V
Less than 0.4 volts
Less than 0.4 volts
Idle Up Sensor
V
0.3 – 0.6
0.3 – 0.6
A/C Clutch Switch (Air Conditioning)
On / Off
Off
Off
ABS Exh. Brake Cut Request
Yes / No
No
No
TCM Exh. Brake Cut Request
Yes / No
No
No
Refrigerator Switch
On / Off
Off
Off
Glow Relay Command
On / Off
Off
Off
Glow Indicator Lamp Command
On / Off
Off
Off
Tech 2 Parameter
Units Displayed
Typical Data Value at
Engine Idle
Typical Data Value at 1600
RPM
Engine Control System (4HK1) 6E-45
Tech 2 Data Definitions
A list of each message displayed on the Tech 2 will be
explained in Engine Controls. This information will
assist in emission or driveability problems. The displays
can be viewed while the vehicle is being driven. Always
perform the Diagnosis System Check – Engine
Controls first. The Diagnostic System Check will
confirm proper system operation.
Ignition Voltage
This parameter displays the ignition voltage measured
at the ignition feed circuit of the ECM. Voltage is
applied to the ECM when the ignition switch is ON
position.
Battery Voltage
This parameter displays the battery voltage measured
at the ECM main relay switched voltage feed circuit of
the ECM. Voltage is applied to the ECM when the ECM
main relay is energized.
Desired Idle Speed
This parameter displays the idle speed requested by
the ECM. The ECM will change desired idle speed
based on engine coolant temperature (ECT) and Idle
up sensor status.
Engine Speed
This parameter displays the speed of the crankshaft as
calculated by the ECM based on inputs from the
crankshaft position (CKP) sensor or camshaft position
(CMP) sensor. The Tech 2 will display the engine speed
in revolution per minute (RPM).
APP Sensor 1 (Accelerator Pedal Position)
This parameter displays the voltage signal sent to the
ECM from the accelerator pedal position (APP) sensor
1 of the APP sensor assembly. APP sensor 1 is a range
of values indicating a low voltage when the accelerator
pedal is not depressed to a high voltage when the
accelerator pedal is fully depressed.
APP Sensor 2 (Accelerator Pedal Position)
This parameter displays the voltage signal sent to the
ECM from the accelerator pedal position (APP) sensor
2 of the APP sensor assembly. APP sensor 2 is a range
of values indicating a high voltage when the accelerator
pedal is not depressed to a low voltage when the
accelerator pedal is fully depressed.
Accelerator Pedal Position (APP) Angle
This parameter displays the angle of the accelerator
pedal as calculated by the ECM using the signals from
the accelerator pedal position sensors. The APP
indicated angle is a range of values indicating a low
percentage when the accelerator pedal is not
depressed to a high percentage when the accelerator
pedal is fully depressed.
Differential Fuel Rail Pressure
This parameter displays the difference of actual and
desired fuel rail pressure (actual value – desired value)
as calculated by the ECM using the signal from the fuel
rail pressure (FRP) sensor. The negative value is
indicating a lower actual fuel rail pressure. The positive
value is indicating a higher actual fuel rail pressure.
Fuel Rail Pressure Sensor
This parameter displays the voltage signal sent to the
ECM from the fuel rail pressure (FRP) sensor. FRP
sensor is a range of values indicating a low voltage
when the fuel rail pressure is low to a high voltage
when the fuel rail pressure is high.
Rail Pressure Feedback
This parameter displays the state of the fuel rail
pressure feedback to the ECM. Wait Mode indicates
the ignition switch is turned ON position. Feedback
Mode indicates the engine is during crank or run.
Shutoff Mode indicates the ignition switch is turned
OFF position.
Fuel Rail Pressure (FRP) Regulator Command
This parameter displays the fuel rail pressure (FRP)
regulator control duty ratio signal based on inputs to the
ECM from various engine sensors. The Tech 2 will
display a low percentage when the FRP regulator is
controlled to open (fuel supply quantity to the fuel rail is
increased). The Tech 2 will display a high percentage
when the FRP regulator is controlled to close (fuel
supply quantity to the fuel rail is reduced).
FRP Regulator Feedback
This parameter displays the fuel rail pressure (FRP)
regulator control feedback current as calculated by the
ECM. The Tech 2 will display a low current when the
FRP regulator is controlled to open (fuel supply
quantity to the fuel rail is increased). The Tech 2 will
display a high current when the FRP regulator is
controlled to close (fuel supply quantity to the fuel rail is
reduced).
Coolant Temperature Sensor
This parameter displays the voltage signal sent to the
ECM from the engine coolant temperature (ECT)
sensor. Coolant temperature sensor is a range of value
indicating a low voltage when the temperature is high
and a high voltage when the temperature is low.
Coolant Temperature
This parameter displays the temperature of the engine
coolant as calculated by the ECM using the signal from
the engine coolant temperature (ECT) sensor. The
Tech 2 will display a low temperature when the ECT
sensor signal voltage is high, and a high temperature
when the ECT sensor signal voltage is low.
Intake Air Temperature Sensor
This parameter displays the voltage signal sent to the
ECM from the intake air temperature (IAT) sensor. IAT
is a range of value indicating a low voltage when the
temperature is high and a high voltage when the
temperature is low.
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