2007 ISUZU KB P190 Workshop Repair Manual

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Page 1657 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-40 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
Fuel Rail Pressure (FRP) Sensor
Fuel Temperature (FT) Sensor Glow Plug
Mass Air Flow (MAF)/ Intake Air Temperature (IAT)
Sensor
Connector No. E-48
Connecto

Page 1658 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-41
Intake Throttle ValveSwirl Control Solenoid Valve
Turbocharger Nozzle Control Solenoid Valve
Connector No. E-47
Connector Color Black
Test Adapter No. J-3561

Page 1659 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-42 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
Vehicle Speed Sensor (VSS)
Connector No.E-106
Connector Color Brown
Test Adapter No. J-35616-64A
Pin No. Wire Color Pin Function
1 YEL/ BLK Solenoid valve con

Page 1660 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-43
Diagnostic Information and Procedures
Engine Control System Check Sheet

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ISUZU KB P190 2007

Page 1661 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-44 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
Diagnostic Starting Point - Engine Controls
Begin the system diagnosis with Diagnostic System
Check - Engine Controls. The Diagnostic System
Check - Engine

6E-44 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
Diagnostic Starting Point - Engine Controls
Begin the system diagnosis with Diagnostic System
Check - Engine Controls. The Diagnostic System
Check - Engine Controls will provide the following
information:
• The identification of the control modules which command the system.
• The ability of the control modules to communicate through the serial data circuit.
• The identification of any stored diagnostic trouble codes (DTCs) and the their statuses.
The use of the Diagnostic System Check - Engine
Controls will identify the correct procedure for
diagnosing the system and where the procedure is
located.
Important: Engine Control System Check Sheet must
be used to verify the complaint vehicle, you need to
know the correct (normal) operating behavior of the
system and verify that the customer complaint is a valid
failure of the system. Reading Flash Diagnostic Trouble Codes (DTC)
The provision for communicating with the ECM is the
Data Link Connector (DLC). The DTC(s) stored in the
ECM memory can be read either through a hand-held
diagnostic scanner such as Tech 2 plugged into the
DLC or by counting the number of flashes of the
malfunction indicator lamp (MIL) or the service vehicle
soon (SVS) lamp when the diagnostic test terminal of
the DLC is grounded. The DLC terminal "1" (diagnostic
request) is pulled "Low" (grounded) by jumped to DLC
terminal "4", which is a ground wire. Once terminals "1"
and "4" have been connected, turn the ignition switch
ON, with the engine OFF. The MIL (except Euro 4
specification) or the SVS lamp (Euro 4 specification)
will indicate a DTC three times is a DTC is present and
history. If more than one DTC has been stored in the
ECM's memory, the DTCs will be output set order with
each DTC being displayed three times. The flash DTC
display will continue as long as the DLC is shorted.
RTW76ESF000301
ON
OFF
ON
OFF
1.2
3.2
2.62.6
2nd digit number1st digit number
3.20.6 2
1.2
0.60.60.6
0.30.30.3
0.30.30.30.30.3
Example:DTC 23 stored
Unit: Second
Example:DTC 225 stored
3rd digit
number 2nd digit number1st digit number
0.60.60.60.60.60.60.60.6
3
0.30.31.21.2
2
25

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ISUZU KB P190 2007

Page 1662 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-45
Diagnostic System Check - Engine Controls
Description
The Diagnostic System Check - Engine Controls is an
organized approach to identifying a condition that

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-45
Diagnostic System Check - Engine Controls
Description
The Diagnostic System Check - Engine Controls is an
organized approach to identifying a condition that is
created by a malfunction in the electronic engine
control system. The Diagnostic System Check must be
the starting point for any driveability concern. The
Diagnostic System Check directs the service technician
to the next logical step in order to diagnose the
concern. Understanding and correctly using the
diagnostic table reduces diagnostic time, and prevents
the replacement of good parts.
Test Description
The numbers below refer to the step numbers on the
diagnostic table.
2. Lack of communication may be because of a partial
or a total malfunction of the serial data circuit.
7. The presence of DTCs which begin with U, indicate
that some other module is not communicating.
10. If there are other modules with DTCs set, refer to
the DTC list. The DTC list directs you to the appropriate
diagnostic procedure. If the control module stores
multiple DTCs, diagnose the DTCs in the following
order:
• Component level DTCs, such as sensor DTCs, solenoid DTCs, actuator DTCs, and relay DTCs.
Diagnose the multiple DTCs within this category in
numerical order. Begin with the lowest numbered
DTC, unless the diagnostic table directs you
otherwise. Diagnostic System Check Engine Controls
Important:
• DO NOT perform this diagnostic if there is not a driveability concern, unless another procedure
directs you to this diagnostic.
• Before you proceed with diagnosis, search for applicable service bulletins.
• Unless a diagnostic procedure instructs you, DO NOT clear the DTCs.
• If there is a condition with the starting system, refer to the starting system section in the engine
mechanical.
• Ensure the battery has a full charge.
• Ensure the battery cables (+) (-) are clean and tight.
• Ensure the ECM grounds are clean, tight, and in the correct location.
• Ensure the ECM harness connectors are clean and correctly connected. DO NOT attempt to
crank the engine with ECM harness connectors
disconnect.
• Ensure the ECM terminals are clean and correctly mating.
• Ensure the fuel injector ID code data is correctly programmed in to the ECM.
• Ensure the immobilizer security information is correctly programmed into the ECM and
immobilizer control unit (ICU).
• If there are fuel system DTC’s (P0087, P0088, P0089, P0093, P1093 or P1094), diagnose sensor
DTCs, solenoid DTCs, actuator DTCs and relay
DTCs first.
Diagnostic System Check - Engine Controls
Step Action Value(s)Yes No
1 Install a scan tool.
Does the scan tool turn ON? —
Go to Step 2 Go to Scan Tool
Does Not Power Up
2 1. Turn ON the ignition, with the engine OFF.
2. Attempt to establish communication with the listed control modules.
•ECM
• Immobilizer control unit (ICU) (If so equipped)
• Transmission control module (TCM) (AISIN A/T only)
Does the scan tool communicate with all the listed
control modules? —
Go to Step 3 Go to Scan Tool
Does Not
Communicate with CAN Device

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ISUZU KB P190 2007

Page 1663 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-46 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
3Notice:
If an immobilizer system is active the ECM
will disable the fuel injection causing the engine to
stall immediately after starting and energize the

6E-46 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
3Notice:
If an immobilizer system is active the ECM
will disable the fuel injection causing the engine to
stall immediately after starting and energize the
starter cut relay to disable cranking.
Attempt to crank the engine.
Does the engine crank? —
Go to Step 4 Go to Step 5
4 Attempt to start the engine.
Does the engine start and idle? —
Go to Step 6 Go to Engine
Cranks but Does
Not Run
5 Does the scan tool display ECM DTCs P0615,
P0633, P161B or U0167?
—
Go to Applicable DTC Problem is relating
to starting system. Refer to the
applicable
diagnostic chart in starting system
6 Select the DTC display function for the following
control modules: •ECM
• ICU (If so equipped)
• TCM (AISIN A/T only)
Does the scan tool display any DTCs? —
Go to Step 7 Go to Step 11
7 Does the scan tool display DTCs which begin with
U or other control module communication fault
DTCs? —
Go to Applicable
DTC Go to Step 8
8 Does the scan tool display ECM DTCs P0601,
P0602, P0604, P0606 or P1621? —Go to Applicable
DTC Go to Step 9
9 Does the scan tool display ECM DTCs P0562 or
P0563, P156A or P156B? —
Go to Applicable
DTC Go to Step 10
10 Is there any other code in any controller that has
not been diagnosed? —Go to Applicable
DTC Go to Step 11
11 Is the customer’s concern with the automatic
transmission? —Go to Diagnostic
System Check - Transmission
Controls Go to Step 12
12 Is the customer’s concern with the immobilizer
system? —Go to Diagnostic
System Check - Immobilizer
Controls Go to Step 13
13 1. Review the following symptoms.
2. Refer to the applicable symptom diagnostic table:
• Hard Start
• Rough, Unstable, or Incorrect Idle and Stalling
• High Idle Speed
•Cuts Out
• Surges
• Lack of Power, Sluggishness, or Sponginess
• Hesitation, Sag, Stumble
• Abnormal Combustion Noise
• Poor Fuel Economy
• Excessive Smoke (Black Smoke)
• Excessive Smoke (White Smoke)
Did you find and correct the condition? —
System OK Go to Intermittent
Conditions
Step
Action Value(s)Yes No

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ISUZU KB P190 2007

Page 1664 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-47
Scan Tool Data List
The Engine Scan Tool Data List contains all engine
related parameters that are available on the scan tool.
A given parameter may appear i

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-47
Scan Tool Data List
The Engine Scan Tool Data List contains all engine
related parameters that are available on the scan tool.
A given parameter may appear in any one of the data
lists, and in some cases may appear more than once,
or in more than one data list in order to group certain
related parameters together. Use the Engine Scan Tool
Data List only after the following is determined:
• The Engine Controls - Diagnostic System Check is completed. • On-board diagnostics are functioning properly.
Scan tool values from a properly running engine may
be used for comparison with the engine you are
diagnosing. The Engine Scan Tool Data List represents
values that would be seen on a normal running engine.
Only the parameters listed below are referenced in this
service manual for use in diagnosis.
Scan Tool Parameter Units Displayed Typical Data Value at Engine Idle Typical Data Value at 2000RPM
Operating Conditions: Engine idling or 2000RPM/ Engine coolant temperature is between 75 to 85 °C (167 to 185 °F)/
Accelerator pedal is constant/ Neutral or Park/ Accessories OFF/ Vehicle located at sea level
Engine Speed RPMNearly 700 RPM Nearly 2000 RPM
Desired Engine Idle Speed RPM700 RPM 700 RPM
Calculated Engine Load %- -
Coolant Temperature °C/ °F 75 to 85 °C/ 167 to 185 °F 75 to 85 °C/ 167 to 185 °F
Engine Coolant Temperature Sensor Volts
0.4 to 0.6 volts 0.4 to 0.6 volts
Intake Air Temperature °C/ °F 20 to 40 °C/ 68 to 104 °F 20 to 40 °C/ 68 to 104 °F
Intake Air Temperature Sensor Volts 1.4 to 2.3 volts1.4 to 2.3 volts
Fuel Temperature °C/ °F 20 to 60 °C/ 68 to 140 °F 20 to 60 °C/ 68 to 140 °F
Fuel Temperature Sensor Volts0.8 to 2.3 volts 0.8 to 2.3 volts
MAF (Mass Air Flow) g/sec300 to 600 g/sec 200 to 600 g/sec
MAF Sensor (Mass Air Flow) Volts1.2 to 1.6 volts 2.0 to 2.7 volts
Barometric Pressure kPa/psi Nearly 100 kPa/ 14.5 psi at sea
levelNearly 100 kPa/ 14.5 psi at sea
level
Barometric Pressure Sensor VoltsNearly 2.3 volts at sea level Nearly 2.3 volts at sea level
Turbocharger Solenoid Command %
50 to 60 % 50 to 60 %
Desired Boost Pressure kPa/ psi Nearly 100 kPa/ 14.5 psi at sea
levelLess than 120 kPa/ 17.4 psi
Boost Pressure kPa/ psi Nearly 100 kPa/ 14.5 psi at sea
levelLess than 120 kPa/ 17.4 psi
Boost Pressure Sensor VoltsNearly 1.0 volt Less than 1.3 volts
Desired Fuel Rail Pressure MPa/ psi 30 MPa/ 4,350 psiMore than 70 MPa/ 10,200 psi
(4JJ1 Euro 4 specification)
More than 50 MPa/ 7,250 psi
(4JJ1 except Euro 4 specification)
More than 60 MPa/ 8,700 psi
(4JK1)
Fuel Rail Pressure MPa/ psi 27 to 33 MPa/ 3,900 to 4,800 psi More than 70 MPa/ 10,200 psi
(4JJ1 Euro 4 specification)
More than 50 MPa/ 7,250 psi (4JJ1 except Euro 4 specification)
More than 60 MPa/ 8,700 psi (4JK1)

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