2007 ISUZU KB P190 ignition

6E-270 Engine Control System (4JH1)
Checks Action
Engine Mechanical Check Inspect the engine mechanical for the following conditions. Refer to the Engine
Mechanical section.
• Inspect for poor cylinder compression. Proper compression is more than 2100 kPa
(309 psi).
• Improper mechanical timing
• Improper valve gap
• Broken or weak valve springs
• W orn camshaft lobes
Additional Checks •
Inspect the generator output voltage. Repair if less than 9 volts or more than 16
volts.
• Inspect the EGR system operating correctly.
• Inspect the A/C operation.
• Inspect the torque converter clutch (TCC) operation.


Fuel Knock/Combustion Noise
Checks Action
DEFINITION:A mild to severe ping, usually worse under acceleration. The engine makes sharp metallic knocks that change
with the throttle opening.
Preliminary Checks • Diagnostic System Check - Engine Controls.
• Ensure the vehicle has an actual problem.
• Inspect for smoke associated with the combustion noise.
• Inspect the fuel quality (cetane index).
• Inspect the scan tool Data List in this section.
• Inspect the Service Bulletins for ECM software updates.
Sensor Checks Inspect the engine control sensors for the following conditions. Refer to the scan tool
Data List in this section.
• Use the scan tool to compare the Engine Coolant Temperature (ECT) with the Intake
Air Temperature (IAT) and Fuel Temperature (FT) on a cold engine condition. If the
difference among temperature reading is more than 5°C (9°F) on a cold engine,
check for high resistance on the low reference circuit and signal circuit or for a
skewed sensor.
Notice: The mass air flow (MAF) sensor is heated and as a result the IAT sensor may
indicate a higher than normal intake air temperature if the ignition switch is being ON.
FT sensor is internal to the PCU and it is part of the fuel injection pump assembly.
• Use the scan tool to compare the MAF Sensor parameter with the Desired MAF
parameter. Start the engine and warm up (allow engine coolant temperature to reach
at least 60°C [140°F]). The MAF Sensor parameter must follow the Desired MAF
parameter within 100 mg/strk. If not, inspect the air intake system, EGR system
components and contaminated, skewed or slow MAF sensor.
• Inspect the crankshaft position (CKP) sensor is tight and the flywheel circumference
is not damaged.
Fuel System Checks •
If excessive smoke is present, check for an injection nozzle(s).Remove each glow
plug from the cylinder head and inspect the tip of the glow plugs for wet by fuel. Use
the cylinder compression gauge. Proper compression is more than 2100 kPa (309
psi). If poor compression is observed, inspect the engine mechanical.
• Inspect the fuel injection nozzle(s) for proper splay condition or operating pressure.
Notice: Only first stage of operating pressure can be checked.
• Inspect the timing device operating correctly. Observe the Actual Injection Timing
parameter with the scan tool while running the engine. The Actual Injection Timing
parameter must follow the Desired Injection Timing within 2°CA on each engine
speed. Engine idle > around 2000 RPM> around 3000 RPM. If not, inspect the fuel
system restriction, air in the fuel or fuel injection pump operation.

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ISUZU KB P190 2007

Engine Control System (4JH1) 6E-271
Checks Action
Engine Mechanical Checks Inspect the engine mechanical for the following conditions. Refer to the Engine
Mechanical section.
• Inspect for poor cylinder compression. Proper compression is more than 2100 kPa
(309 psi).
• Inspect for incorrect basic engine parts such as camshaft, cylinder head, pistons,
etc.
• Inspect for any excessive oil entering combustion chamber.
Additional Checks •
Inspect the EGR system operating correctly.
• Inspect other possible causes that can make similar noise such as loose component
parts, bracket, mount and weak clutch damper spring.


Poor Fuel Economy
Checks Action
DEFINITION:Fuel economy, as measured by actual road tests and several tanks of fuel, is noticeably lower than expected.
Also, the economy is noticeably lower than it was on this vehicle at one time, as previously shown by actual road tests.
Preliminary Checks • Remove the air cleaner and check for dirt, or for air ducts being plugged or
restricted. Replace as necessary.
• Inspect the driving habits of the owner.
• Is the A/C ON full time, defroster mode ON?
• Are the tires at the correct pressure?
• Are the tire sizes changed?
• Are excessively heavy loads being carried?
• Is the acceleration too much, too often?
• Inspect for clutch slip.
• Inspect brake drag.
• Inspect dive belt tension.
• Inspect for a proper transmission shift pattern and down shift operation (A/T only).
• Inspect the fuel quality (cetane index).
• Inspect the engine oil level and quality.
• Suggest to the owner to fill the fuel tank and recheck the fuel economy.
• Suggest to the driver to read the Important Facts on Fuel Economy in the Owner
Manual.
• Inspect the odometer is correctly operated.
• Inspect the Service Bulletins for ECM software updates.
Sensor Checks Inspect the engine control sensors for the following conditions. Refer to the scan tool
Data List in this section.
• Use the scan tool to compare the Engine Coolant Temperature (ECT) with the Intake
Air Temperature (IAT) and Fuel Temperature (FT) on a cold engine condition. If the
difference among temperature reading is more than 5°C (9°F) on a cold engine,
check for high resistance on the low reference circuit and signal circuit or for a
skewed sensor.
Notice: The mass air flow (MAF) sensor is heated and as a result the IAT sensor may
indicate a higher than normal intake air temperature if the ignition switch is being ON.
FT sensor is internal to the PCU and it is part of the fuel injection pump assembly.
Fuel System Checks Inspect the fuel system for the following conditions. Refer to the Fuel System section.
• Inspect the fuel type and quality.
• Check fuel leak.
Cooling System Checks Inspect the cooling system for the following conditions. Refer to the Cooling System
Section.
• Inspect the engine coolant level.
• Inspect the engine thermostat for always being open or for the wrong heat range.
• Inspect the engine cooling fan for always being ON.

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6E-272 Engine Control System (4JH1)
Checks Action
Air Intake System Checks Inspect the air intake system for the following conditions.
• Inspect the air cleaner and air intake ducts for a restriction, holes, or leaks.
• Inspect for a restriction or leak in the intercooler.
• Inspect for a restriction in the turbocharger inlet duct.
• Inspect for a restriction or deposit in the intake throttle bore.
• Inspect for a restriction or leak in the intake manifold.
• Inspect for a restriction or damage at MAF sensor.
Exhaust System Checks Inspect the exhaust system for a possible restriction. Refer to the Exhaust System
section.
• Inspect for a restriction in the catalytic converter or exhaust pipes.
Engine Mechanical Checks Inspect the engine mechanical for the following conditions. Refer to the Engine
Mechanical section.
• Inspect for poor cylinder compression. Proper compression is more than 2100 kPa
(309 psi).


Excessive Smoke (Black Smoke)
Checks Action
DEFINITION:Black smoke under load, idle or start up hot or cold.
Preliminary Check •
Ensure the vehicle has an actual problem.
• Inspect the engine control module (ECM) and fuel injection pump control unit (PCU)
grounds for being clean, tight, and in their proper locations.
• Remove the air cleaner and check for dirt, or for air ducts being plugged or
restricted. Replace as necessary.
• Inspect the fuel quality (cetane index).
• Inspect the engine oil level and quality.
• Inspect the Service Bulletins for ECM software updates.
Sensor Checks Inspect the engine control sensors for the following conditions. Refer to the scan tool
Data List in this section.
• Use the scan tool to compare the Engine Coolant Temperature (ECT) with the Intake
Air Temperature (IAT) and Fuel Temperature (FT) on a cold engine condition. If the
difference among temperature reading is more than 5°C (9°F) on a cold engine,
check for high resistance on the low reference circuit and signal circuit or for a
skewed sensor.
Notice: The mass air flow (MAF) sensor is heated and as a result the IAT sensor may
indicate a higher than normal intake air temperature if the ignition switch is being ON.
FT sensor is internal to the PCU and it is part of the fuel injection pump assembly.
• Use the scan tool to compare the MAF Sensor parameter with the Desired MAF
parameter. Start the engine and warm up (allow engine coolant temperature to reach
at least 60°C [140°F]). The MAF Sensor parameter must follow the Desired MAF
parameter within 100 mg/strk. If not, inspect the air intake system, EGR system
components and contaminated, skewed or slow MAF sensor.
• Use the scan tool to observe the Accelerator Pedal Position Accelerator Pedal
Position. Accelerator Pedal Position indicating angle parameter should change
linearly from 0% to 100% according to the accelerator pedal operation.
Fuel System Checks Inspect the fuel system for the following conditions. Refer to the Fuel System section.
• Inspect the fuel injection nozzle(s) for proper splay condition or operating pressure.
Notice: Only first stage of operating pressure can be checked.
• Inspect the timing device operating correctly. Observe the Actual Injection Timing
parameter with the scan tool while running the engine. The Actual Injection Timing
parameter must follow the Desired Injection Timing within 2°CA on each engine
speed. Engine idle > around 2000 RPM> around 3000 RPM. If not, inspect the fuel
system restriction, air in the fuel or fuel injection pump operation.

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ISUZU KB P190 2007

Engine Control System (4JH1) 6E-273
Checks Action
Air Intake System Checks Inspect the air intake system for the following conditions.
• Inspect the air cleaner and air intake ducts for a restriction, holes, or leaks.
• Inspect for a restriction or leak in the intercooler.
• Inspect for a restriction in the turbocharger inlet duct.
• Inspect for a restriction or deposit in the intake throttle bore.
• Inspect for a restriction or leak in the intake manifold.
• Inspect for a restriction or damage at MAF sensor.
• Inspect for a worn or damaged turbocharger turbine wheel, shaft or compressor
wheel. Refer to turbocharger inspection in the Engine Mechanical section.
Exhaust System Checks Inspect the exhaust system for a possible restriction. Refer to the Exhaust System
section.
• Inspect for a restriction in the catalytic converter or exhaust pipes.
Engine Mechanical Check Inspect the engine mechanical for the following conditions. Refer to the Engine
Mechanical section.
• Inspect for poor cylinder compression. Proper compression is more than 2100 kPa
(309 psi).
• Inspect for incorrect basic engine parts such as camshaft, cylinder head, pistons,
etc.
• Inspect for any excessive oil entering combustion chamber.
• Improper mechanical timing
• Improper valve gap
• Broken or weak valve springs
• W orn camshaft lobes
Additional Checks •
Inspect the EGR system operating correctly.
• Inspect the excessive blow-by gasses.
• Inspect the scan tool Data List in this section.


Excessive Smoke (White Smoke)
Checks Action
DIFINITION:W hite smoke under load, idle or start up hot or cold.
Preliminary Check •
Ensure the vehicle has an actual problem.
• Inspect the engine control module (ECM) and fuel injection pump control unit (PCU)
grounds for being clean, tight, and in their proper locations.
• Inspect the fuel quality (cetane index).
• Inspect the Service Bulletins for ECM software updates.
Sensor Check Inspect the engine control sensors for the following conditions. Refer to the scan tool
Data List in this section.
• Use the scan tool to compare the Engine Coolant Temperature (ECT) with the Intake
Air Temperature (IAT) and Fuel Temperature (FT) on a cold engine condition. If the
difference among temperature reading is more than 5°C (9°F) on a cold engine,
check for high resistance on the low reference circuit and signal circuit or for a
skewed sensor.
Notice: The mass air flow (MAF) sensor is heated and as a result the IAT sensor may
indicate a higher than normal intake air temperature if the ignition switch is being ON.
FT sensor is internal to the PCU and it is part of the fuel injection pump assembly.
• Inspect the crankshaft position (CKP) sensor is tight and the flywheel circumference
is not damaged.
Fuel System Checks Inspect the fuel system for the following conditions. Refer to the Fuel System section.
• Inspect the fuel injection nozzle(s) for proper splay condition or operating pressure.
Notice: Only first stage of operating pressure can be checked.
• Inspect the timing device operating correctly. Observe the Actual Injection Timing
parameter with the scan tool while running the engine. The Actual Injection Timing
parameter must follow the Desired Injection Timing within 2°CA on each engine
speed. Engine idle > around 2000 RPM> around 3000 RPM. If not, inspect the fuel
system restriction, air in the fuel or fuel injection pump operation.

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ISUZU KB P190 2007

6E-276 Engine Control System (4JH1)
1. Connect the scan tool to the vehicle DLC, with theengine and the scan tool OFF.
2. Turn ON the scan tool.
3. Select Diagnostic > appropriate vehicle identification > Powertrain > 4JH1-TC >
Programming > Program VIN.
4. Input correct VIN reading from stamped VIN o
r
affixed VIN plate on the vehicle.
Select Lock ECU and lock the programmed VIN.

Service Programming System (SPS)
Description
The service programming system (SPS) allows a
technician to program a control module through the data
link connector (DLC). The information transfer circuit that
is used at the DLC is the same serial data circuit used be
the scan tool for retrieving diagnostic trouble codes
(DTCs), displaying data, clearing DTCs etc. This
procedure offers the ability to install software/calibrations
matched to a particular vehicle.
Most control modules have two types of memory. The
software/calibrations reside in the flash memory. The two
types of memory are listed below: • Electrically Erasable Programmable Read Onl
y
Memory (EEPROM).
This type of memory allows selected portions o
f
memory to be programmed while other portions
remain unchanged.
Certain learned values reside in the EEPROM, such as:
- The vehicle identification number (VIN)
- The software/calibrations identification numbers
- The control module security information
• Flash Read Only Memory-Flash Memory
Flash memory has increased memory storage capacity. During programming, all information within
this type of memory is erased, and then replaced
with entirely new information.

Service Programming Methods
The two methods of programming an engine control
module (ECM) are listed below: • Remote Programming
• Pass Thru Programming
For information on programming an ECM using one o
f
the methods listed above, refer to Service Programming
System (SPS) (Remote Procedure) or Service
Programming System (SPS) (Pass-Thru Procedure).


Before Programming a Control Module
Important:
DO NOT program an existing ECM with the identical
software/calibration package. This procedure is not a
short cut to correct the driveability condition. This is an
ineffective repair. An ECM should only be programmed
when the following occurs: • W hen a service procedure instructs you to replace
the ECM. W hen the ECM from another vehicle is
installed, VIN must be changed. And change
vehicle information as necessary such as type o
f
transmission.
• An updated software/calibrations is released.
Ensure that the following conditions are met before
programming an ECM: • The scan tool PCMCIA card is programmed with
the latest software.
• The TIS 2000 is installed with the latest software.
• The hardware key is plugged into the compute
r
port.
• Vehicle system voltage:
- There are no charging system concerns. All charging system concerns must be repaired
before programming the ECM.
- The battery voltage is greater than 12 volts bu
t
less than 16 volts. The battery must be fully
charged before programming the ECM.
-
A battery charger is NOT connected to the
vehicles battery. Incorrect system voltage o
r
voltage fluctuations from a battery charger may
cause programming failure or ECM damage.
- Turn OFF or disable any system that may put a load on the vehicles battery. Turn OFF o
r
disable systems such as:
◊ Heating, ventilation, and air conditioning
(HVAC) systems
◊ Headlights
◊ Room lights
◊ Accessory equipment
• The ignition switch is in the proper position. The
scan tool prompts you to turn ON the ignition, with
the engine OFF. DO NOT change the position o
f
the ignition switch during the programming
procedure unless instructed to do so.
• All tool connections are secure:
- The RS-232 cable
- The connection at the DLC
- The voltage supply circuits


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Engine Control System (4JH1) 6E-277
• DO NOT disturb the tool harnesses while
programming. If an interruption occurs during the
programming procedure, programming failure o
r
ECM damage may occur.
• If you are performing the Pass-Thru programming
procedure using a notebook computer without the
power cord, ensure that the internal battery is full
y
charged.

Service Programming System (SPS)
(Remote Procedure)
The Remote Service Programming System (SPS)
method is a three-step process that involves the
following procedures: 1. Connecting the scan tool to the vehicle and obtaining the information from the engine control
module (ECM).
2. Connecting the scan tool to the terminal and downloading a new calibration file from the terminal
into the scan tool memory.
3. Reconnecting the scan tool to the vehicle and uploading the new calibration file into the ECM.
Performing the Remote Procedure 1. Connect the scan tool to the vehicle and obtain the ECM information using the following procedure:
Important:
Ensure the ECM is installed in the vehicle and the batter
y
is fully charged before programming. a. Connect the scan tool to the vehicle data linkconnector (DLC), with the engine and the scan
tool OFF.
b. Turn ON the scan tool.
c. Press Enter at the title screen.
d. Turn ON the ignition, with the engine OFF.
e. Select Service Programming System at the Main Menu.
f. Select Request Info.
g. If there is already stored in the scan tool, the existing data is displayed on the screen. The
scan tool asks user to keep existing data Keep
Data or Continue to request new vehicle
information from the ECM. If there is no data in
the scan tool, it will immediately start vehicle
identification.
h. Enter the vehicle description by following the on- screen instructions based on stamped VIN o
r
affixed VIN plate on the vehicle.
i. During obtaining information, the scan tool is
receiving information from any modules at the
same time. But only ECM information is
displayed on the screen.
j. Turn OFF all accessories and select Continue.
k. Verify that the correct VIN is entered on the scan tool. If the VIN is incorrect, write down the
correct VIN.
2. Turn OFF the scan tool.
3. Disconnect the scan tool from the vehicle.
4. Turn OFF the ignition.
5. Transfer the data from the terminal to the scan tool using the following procedure:
Important:
The TIS supports service programming with the scan
tool scan tool only. a. Connect the scan tool to the terminal.
b. Launch the TIS application at the terminal.
c. Select the Service Programming System at the main screen.
d. Highlight the following information on the Selec
t
Diagnostic Tool and Programming Process
screen: • Select Diagnostic Tool-Select scan tool.
• Select Programming Process-Identif
y
whether an existing ECM is being
reprogrammed or an ECM is being
replaced with a new one.
• Select ECU Location-Select Vehicle.
e. Select Next.
f. Verify the connections on the Preparing fo
r
Communication screen and select Next.
g. Verify the VIN on the Validate Vehicle Identification Number (VIN) screen and selec
t
Next.
Important:
If the ECM is replaced to new one, VIN does no
t
displayed. Input correct VIN reading from stamped VIN
or affixed VIN plate on the vehicle. If the ECM from
another vehicle is installed, input correct VIN by same
way.
h. Highlight Engine on the System Type screen and select Next, if requested.
i. Complete the following information based on the service ID plate on the Validate Vehicle
Data screen until Next is highlighted: • Model
• Model Year
• Engine
• Type of Transmission

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6E-278 Engine Control System (4JH1)
• Destination Code
j. Select Next.
k. Verify your selection on the Summary screen.
Important:
Refer to Service Bulletins before service programming is
performed if the bulletins are listed along with the
calibration files.
Important:
Select Cancel if you receive a message stating that the
calibration selected is already the current calibration in
the ECM and reprogramming with the same download is
not allowed.
l. Select Reprog.
m. The Transfer Data screen will appear until the progress bar reaches 100%.
6. Close the application and return to the TIS application selection screen after the download is
complete.
7. Turn OFF the scan tool.
8. Disconnect the scan tool from the terminal.
9. Transfer the data from the scan tool to the ECM using the following procedure:
a. Connect the scan tool to the vehicle DLC, with the engine and the scan tool OFF.
b. Turn ON the scan tool.
c. Press Enter at the Title screen.
d. Turn ON the ignition, with the engine OFF.
e. Select Service Programming System.
f. Select the Program ECU on the scan tool.
g. Follow the on-screen instructions and select Continue.
h. Programming in Process will appear until the progress bar reaches 100%.
Important:
The vehicle fitted with automatic transmission, Check
Trans lamp may blink while programming the ECM since
communication between the ECM and TCM is
interrupted. Clear DTC in any module afte
r
programming.
i. Select Continue and exit the program after the scan tool displays Programming W as
Successful.
10. Turn OFF the ignition.
11. Turn OFF the scan tool.
12. Disconnect the scan tool from the vehicle.

Service Programming System (SPS) (Pass-
Thru Procedure)
Pass-Thru programming allows the scan tool to remain
connected to the terminal and to the vehicle throughou
t
the programming process. The vehicle must be in close
proximity to the terminal while using Pass-Thru.
Important:
The TIS supports service programming with the scan
tool scan tool only.
1. Launch the TIS application at the terminal.
2. Select the Service Programming System at the main screen.
3. Highlight the following information on the Selec
t
Diagnostic Tool and Programming Process screen:
• Select Diagnostic Tool-Select Pass-Thru
• Select Programming Process-Identify whethe
r
as existing engine control module (ECM) is
being reprogrammed or an ECM is being
replaced with a new one.
• Select ECU Location-Select Vehicle.
4. Select Next.
5. Complete all vehicle data on the Preparing fo
r
Communication/Determine Vehicle screen until
Next is highlighted.
6. Select Next.
7. Follow the instruction on the Preparing fo
r
Communication screen.
Important:
In order to reduce the potential for signal loss, the RS-
232 cable should not be more than 25 feet long.

8. Select Next.
9. Verify the VIN on the Validate Vehicle Identification Number (VIN) screen and select Next.
Important:
If the ECM is replaced to new one, VIN does no
t
displayed. Input correct VIN reading from stamped VIN
or affixed VIN plate on the vehicle. If the ECM from
another vehicle is installed, input correct VIN by same
way. 10. Highlight Engine on the System Type screen and
select Next, if requested.
11. Complete the following information based on the service ID plate on the Validate Vehicle Data
screen until Next is highlighted:
• Model
• Model Year
• Engine
• Type of Transmission
• Destination Code
12. Select Next.
13. Verify your selection on the Summary screen.


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6E-284 Engine Control System (4JH1)
Important:
To prevent possible electrostatic discharge damage,
follow these guidelines: • Do not touch the ECM connector pins or soldered
components on the ECM circuit board.
• Do not open the replacement part package until
the part is ready to be installed.
• Before removing the part from the package,
ground the package to a known good ground on
the vehicle.
• If the part has been handled while sliding across
the seat, while sitting down from a standing
position, or while walking a distance, touch a
known good ground before installing the part.
• Charge by induction occurs when a person with
well insulated shoes stands near a highly charged
object and momentarily touches ground. Charges
of the same polarity are drained off leaving the
person highly charged with opposite polarity.
Malfunction Indicator Lamp (MIL) Operation
The malfunction indicator lamp (MIL) is located in the
instrument panel cluster (IPC). The MIL will display the
following symbols when commanded ON:



RTW 76ESH004001
The MIL indicates that an emission or performance
related fault has occurred and vehicle service is
required. The following is a list of the modes o
f
operation for the MIL: • The MIL illuminates for approximately 2 seconds
when the ignition switch is turned ON, with the
engine OFF. This is a bulb test to ensure the MIL
is able to illuminate.

•
The MIL remains illuminated after the engine is
started if the ECM detects a fault. A DTC is stored
any time the ECM illuminates the MIL due to an
emission or performance related fault.

Engine Control Component Description
Accelerator Pedal Position (APP) Sensor & Idle
Switch






RTW 66ESH001301
The accelerator pedal position (APP) sensor is mounted
on the throttle assembly. The engine control module
(ECM) uses the APP sensor s to determine the amount
of acceleration or deceleration desired by the person
driving the vehicle via the fuel injection control.
The idle switch is also mounted on the intake throttle
assembly. The idle switch is part of the APP senso
r
assembly. The idle switch is a normally closed type
switch. W hen the accelerator pedal is released, the idle
switch signal to the ECM is low voltage.








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