2007 ISUZU KB P190 Workshop Repair Manual

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Page 1313 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Control System (4JH1) 6E-279
Important:
Refer to Service Bulletins before service programming is
performed if the bulletins are listed along with the
calibration files.
Important:
Sele

Engine Control System (4JH1) 6E-279
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 scan tool and reprogramming with the same
download is not allowed.
14. Select Reprog.
15. The Transfer Data screen 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. 16. Select Close on the Programming Complete
screen.
17. Turn OFF the scan tool.
18. Disconnect the scan tool from the vehicle.

Accelerator Pedal Position (APP) Sensor
Replacement
Removal Procedure 1. Disconnect the negative battery cable.
2. Disconnect the APP sensor connector.
3. Loosen two screws and remove APP sensor from the throttle body.

Installation Procedure 1. Temporary tighten the APP sensor by two screws. 2. Connect a APP sensor connectors to the
APP
sensor.
3. Connect the Tech2 to the vehicle.
4. Connect the negative battery cable.
5. Select "Data Display" with the Tech2.
6. Check the APP sensor data and adjust the
APP
sensor.
7. Tighten two screws.

Crankshaft Position (CKP) Sensor
Replacement
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect connector from the CKP sensor.
3. Loosen a bolt and remove the CKP sensor from the clutch housing.

Installation Procedure
1. Install the CKP sensor to the clutch housing.
2. Tighten CKP sensor by a bolt with specified tightening torque.
Tightening Torque
• Bolts: 8.0 - 12.0 N.m (0.8 - 1.2 kgf.m)
3. Connect a CKP sensor connector to the CKP sensor.
4. Connect the negative battery cable.

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ISUZU KB P190 2007

Page 1314 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-280 Engine Control System (4JH1)
EGR Solenid Valve Replacement
Removal Procedure 1. Disconenct the negative battery cable.
2. Disconnect a EGR solenoid valve harness connector.
3. Disconnect

Page 1315 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Control System (4JH1) 6E-281

Installation Procedure
1. Install the MAF & IAT sensor assembly into intake air duct.
2. Tighten the clips.
3. Connect a MAF & IAT sensor co

Page 1316 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-282 Engine Control System (4JH1)
Installation Procedure 1. Set the vacuum pressure sensor on the bracket and tighten a bolt.
2. Connect a harness connector to the vacuum pressure sensor.
3. Co

Page 1317 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Control System (4JH1) 6E-283
Description And Operation
Engine Control Module (ECM) Description

RTW 66ESH001201
The engine control module (ECM) is designed to
withstand normal current

Engine Control System (4JH1) 6E-283
Description And Operation
Engine Control Module (ECM) Description

RTW 66ESH001201
The engine control module (ECM) is designed to
withstand normal current draws associated with vehicle
operation. Avoid overloading any circuit. W hen testing
for opens and shorts, do not ground or apply voltage to
any of the ECM circuits unless instructed to do so. In
some cases, these circuits should only be tested using
a digital multi meter (DMM). The ECM should remain
connected to the ECM harness.
The ECM is located on the floor panel. The ECM mainl
y
controls the following.
• The fuel system control
• The exhaust gas recirculation (EGR) system
control
• The preheating (glow) system control
• The A/C compressor control
• On-board diagnostics for engine control
The ECM constantly observes the information from
various sensor s. The ECM controls the systems that
affect vehicle performance. The ECM performs the
diagnostic function of the system. The ECM can
recognize operational problems, alert the driver through
the malfunction indicator lamp (MIL), and store
diagnostic trouble codes (DTCs). DTCs identify the
system faults to aid the technician in making repairs.

ECM Voltage Description
The ECM supplies a buffered voltage to various
switches and sensor s. The ECM can do this because
resistance in the ECM is so high in value that a test
lamp may not illuminate when connected to the circuit.
An ordinary shop voltmeter may not give an accurate
reading because the voltmeter input impedance is too
low. Use a 10-megaohm input impedance DMM, to
ensure accurate voltage readings. The input and/o
r
output devices in the ECM include analog-to-digital
converters, signal buffers, counters, and special drivers.
The ECM controls most components with electronic
switches which complete a ground circuit when turned
ON.
Aftermarket Electrical and Vacuum Equipment
Aftermarket or add-on electrical and vacuum equipment
is defined as any equipment which connects to the
vehicle's electrical or vacuum systems that is installed
on a vehicle after the vehicle leaves the factory. No
allowances have been made in the vehicle design fo
r
this type of equipment. No add-on vacuum equipment
should be added to this vehicle. Add-on electrical
equipment must only be connected to the vehicle's
electrical system at the battery power and ground. Add-
on electrical equipment, even when installed to these
guidelines, may still cause the powertrain system to
malfunction. This may also include equipment not
connected to the vehicle electrical system such as
portable telephones and audios. Therefore, the first
step in diagnosing any powertrain fault is to eliminate all
aftermarket electrical equipment from the vehicle. Afte
r
this is done, if the fault still exists, the fault may be
diagnosed in the normal manner.
Electrostatic Discharge Damage
Electronic components used in the ECM are often
designed to carry very low voltage. Electronic
components are susceptible to damage caused b
y
electrostatic discharge. By comparison, as much as
4,000 volts may be needed for a person to feel even the
zap of a static discharge. There are several ways for a
person to become statically charged. The most
common methods of charging are by friction and
induction. •
An example of charging by friction is a person
sliding across a vehicle seat.

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ISUZU KB P190 2007

Page 1318 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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 th

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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ISUZU KB P190 2007

Page 1319 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Control System (4JH1) 6E-285
Crankshaft Position (CKP) Sensor

RTW 06ESH000101

RTW 66ESH001401
Legend
1. Crankshaft Position (CKP) Sensor
2. Flywheel

Page 1320 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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

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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