ISUZU KB P190 2007 Workshop Repair Manual

Engine Control System (4JH1) 6E-27
Engine Coolant Temperature Coolant (ECT) Sensor











LNW 46ESH003901

Connector No. E-41
Connector Color Gray
Test Adapter No. J-35616-4A
Pin W ire Color Pin Function
1 GRY ECT Sensor Signal
2 BLK/PNK ECT Sensor Low Reference

Fuel Injection Pump Control Unit (PCU)










RTW 66ESH000701

Connector No. E-6
Connector Color Black
Test Adapter No. J-35616-8
Pin W ire Color Pin Function
1 RED CAN Low Signal
2 YEL CAN High Signal
3 


Not Used
Connector No. E-6
Connector Color Black
Test Adapter No. J-35616-8
Pin W ire Color Pin Function
4 


Not Used
5 ORN Engine Shutoff (ESO) Solenoid
Valve Control Signal Input
6 BLK Ground
7 BLU/RED Battery voltage
8 PNK CKP Sensor Signal Input
9 


Not Used

Glow Plug











LNW 46ESH000701

Connector No. E-49
Connector Color Silver
Pin W ire Color Pin Function
1 BLK/RED Power Supply


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ISUZU KB P190 2007

6E-28 Engine Control System (4JH1)
Idle Switch










RTW 66ESH000301

Connector No. E-23
Connector Color Gray
Test Adapter No. J-35616-33
Pin W ire Color Pin Function
1 BLK Idle Switch Ground
2 GRN/ BLK Idle Switch Signal
3 


Not Used

Mass Air Flow (MAF) / Intake Air Temperature
Sensor










RTW 66ESH000801

Connector No. C-116
Connector Color Black
Test Adapter No. J-35616-4A
Pin W ire Color Pin Function
1 BLK/BLU IAT Sensor Signal
Connector No. C-116
Connector Color Black
Test Adapter No. J-35616-4A
Pin W ire Color Pin Function
2 BLU/RED MAF Sensor Ignition Voltage Feed
3 BLK/RED MAF Sensor & IAT Sensor Low
Reference
4 W HT/RED MAF Sensor 5 Volts Reference
5 GRN/RED MAF Sensor Signal

Turbocharger Solenoid Valve








RTW 66ESH000901

Connector No. C-123
Connector Color Black
Test Adapter No. J-35616-64A
Pin W ire Color Pin Function
1 BLU/RED Solenoid Valve 12 Volts Feed
2 BRN/RED Solenoid Valve Control


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Engine Control System (4JH1) 6E-29
Vacuum Pressure Sensor









RTW 66ESH001001

Connector No. C-124
Connector Color Black
Test Adapter No. J-35616-33
Pin W ire Color Pin Function
1 RED/BLU Vacuum Pressure Sensor Signal
2 BLK/PNK Vacuum Pressure Sensor Low
Reference
3 W HT/BLU Vacuum Pressure Sensor 5 Volts Reference

Vehicle Speed Sensor (VSS)








LNW 46ESH001401






Connector No. E-44
Connector Color Gray
Test Adapter No. J-35616-33
Pin W ire Color Pin Function
1 YEL VSS 12 Volts Feed
2 LT GRN/
WHT VSS Low Reference
3 BLK/YEL VSS Signal


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6E-30 Engine Control System (4JH1)
Diagnostic Information And Prosedures
Engine Control System Check Sheet





ENGINE CONTROL SYSTEM CHECK SHEET Inspectors Name
Customer’s Name Model & Model Year
Driver’s Name Chassis No.
Date Vehicle Brought In Engine No.
License No. Odometer Reading Km/miles

□ Engine Does
Not Run □
Engine does not crank
□No initial combustion
□ No complete combustion
□
Hard Start
□ Engine cranks slowly
□Other ( )
□
Abnormal idling speed
□High idling speed ( RPM)
□ Low idling speed ( RPM)
□
Rough idling □
Incorrect Idle
□ Other ( )
□
Hesitation, sag, stumble
□Surge, chuggles
□ Cut out, misses
□
Lack of power, sluggishness, sponginess □
Poor
Driveability □ Other ( )

□ Soon after starting
□After accelerator pedal depressed
Engine Stall
□ During A/C operation
□After accelerator pedal released
□ Shifting from N to D □

□ Other ( )
□
Black smoke
□White smoke
□ Poor fuel economy
□
Fuel knock, combustion noise
Problem Symptoms
□
Others
□ Other ( )
Dates problem occurred
□
Constant
□Intermittently ( times per day/month)
□ Once only Problem frequency
□ Other (
)
□ Fine
□Cloudy
□Rainy
□ Snow Weather
□ Various/Other (
)
□ Hot (approx. )
□Warm
□Cool
□ Cold (approx. )Outside
Temperature □ Any temperature
□
Highway
□Suburbs
□City area
□ Uphill Place
□ Downhill
□Rough road
□Other (
)
□ Over (approx. tons)
□No load
Load Condition
□ Other (approx. tons)

□ Cold
□Warming up
□After warming up
□ Any temperature Engine
Temperature □ Other ( )
□
Starting
□Just after starting ( Min.)
□ Idling
□
Racing
□Driving
□Constant speed
□ Acceleration
□
Deceleration
□A/C switch On/Off Engine Operation
□ Other ( )
Fuel Amount
□ Full
□Above 1/2
□Below 1/2
□ Near empty
Condition When Problem Occurs
Fuel
Bland
Condition of MIL
□Remains On
□Intermittently turns On
□ Does not turn On
Present Code
□Nothing
□P Code & Symptom Code
No. ( )Diagnostic Trouble
Code (DTC) or Flash
Code History Code □Nothing
□P Code & Symptom Code
No. ( )

Other Additional
Condition


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Engine Control System (4JH1) 6E-31
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 fo
r
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 o
f
the system.

Reading Flash Diagnostic Trouble Codes
The provision for communicating with the ECM is the
Data Link Connector (DLC). The DTCs stored in the
ECM memory can be read either through a hand-held
diagnostic scanner such as scan tool plugged into the
DLC or by counting the number of flashes of the MIL
when the diagnostic test terminal of the DLC is
grounded. The DLC terminal “6” (diagnostic request
switch) is pulled “Low” (grounded) by jumped to DLC
terminal “4”, which is a ground wire.
Once terminals “4” and “6” have been connected, the
ignition switch must be moved to the “ON” position, with
the engine not running. The MIL will initially flash 12.
Then, the MIL will flash the first stored DTC three times,
second stored DTC three times and so on. All the
stored DTCs are flashed, then return 12 and continue to
flash the DTC. If no DTC exists, the MIL flashes 12
continuously. The flash DTC display will continue as
long as the DLC is shorted.









RTW 66ESF000501

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6E-32 Engine Control System (4JH1)
Breaker Box
Breaker Box Connection Type A





RTW 66ESH003601
Legend
1. Engine Control Module (ECM)
2. Harness Adapter
3. ECM - Harness Connector
4. Breaker Box
5. ECM is disconnected

Breaker Box Connection Type B




RTW 66ESH003701
Legend
1. Engine Control Module (ECM)
2. Harness Adapter
3. ECM - Harness Connector
4. Breaker Box
5. ECM is connected

Although probe to the engine control module (ECM)
harness connector is possible by Test Adapter,
Breaker Box Connection Type A is suitable usage to
prevent misprobe and damage of female terminals
when test open circuit or short to ground between the
ECM and electrical components, since the terminals
where the harness connector of the ECM is thin have
gathered.
The ECM and other connectors have water proof
terminal that is not allowed to back probe. Breaker
Box Connection Type B is suitable usage to test short
to voltage circuit or signal check between the ECM
and electrical components.


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Engine Control System (4JH1) 6E-33
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 Keyword 2000 serial data
circuit. The specified procedure determines the
particular condition.



11. 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.
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 fo
r
applicable service bulletins.
• Unless a diagnostic procedure instructs you, DO
NOT clear the DTCs.
• If there is a condition with the starting system, refe
r
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.
• Ensure the ECM terminals are clean and correctl
y
mating.
• Ensure the fuel injection pump control unit (PCU)
ground is clean, tight, and in the correct location.
• Ensure the PCU harness connectors are clean and
correctly connected.
• Ensure the PCU terminals are clean and correctl
y
mating.
• Ensure the vehicle maintenance has been done
enough.

Step Action Value(s) Yes No
1 Install the scan tool.
Does the scan tool turn ON? 

Go to Step 2 Go to scan tool
Does Not Power Up

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6E-34 Engine Control System (4JH1)
Step Action Value(s) Yes No
2 1. Turn ON the ignition, with the engine OFF.
2. Attempt to establish communication with the listed control modules. • Engine control module (ECM)
• Transmission control module (TCM) (A/T
only)
• Electronic hydraulic control unit (EHCU)
Does the scan tool communicate with all the listed
control modules? 

Go to Step 3 Go to scan tool
Does Not
Communicate with Keyword 2000 Device
3 Attempt to start the engine. Does the engine start and idle? 
Go to Step 4 Go to Engine
Cranks but Does Not Run
4 Select the DTC display function for the following control modules: • ECM
• TCM (A/T only)
• EHCU
Does the scan tool display any DTCs? 

Go to Step 5 Go to Step 12
5 1. Turn OFF the ignition for 30 seconds. 2. Start the engine.
3. Monitor the DTC Information with the scan tool.
Did you complete the action? 

Go to Step 6 
6 Does the scan tool display ECM DTC P0602?
 Go to Applicable
DTC Go to Step 7
7 Does the scan tool display ECM DTC P0251 (Symptom Code 9 or A), P0606 (Symptom Code A
or B) or P1605 (Symptom Code C, D or E)? 
Go to Applicable
DTC Go to Step 8
8 Does the scan tool display ECM DTC P0560 (Symptom Code 1, 2 or A)? 
Go to Applicable
DTC Go to Step 9
9 Does the scan tool display following ECM DTC
P0561 (Symptom Code A or B) or P1625 (Symptom
Code A or B)? 
Go to Applicable
DTC Go to Step 10
10 Does the scan tool display following ECM DTC P1650 (Symptom Code A or B) or P1651 (Symptom
Code A or B)? 
Go to Applicable
DTC Go to Step 11
11 Is there any other code in any controller that has not
been diagnosed? 
Go to Applicable
DTC Go to Step 12
12 Is the customer’s concern with the automatic
transmission?  Go to Diagnostic
System Check Transmission Control Go to Step 13
13 Is the customer’s concern with the ABS system?
 Go to Diagnostic
System Check Brake Control Go to Step 14

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Engine Control System (4JH1) 6E-35
Step Action Value(s) Yes No
14 1. Review the following symptoms.
2. Refer to the applicable symptom diagnostic table: • Hard Start
• Rough, Unstable, or Incorrect Idle and
Stalling
• Cuts Out, Misses
• Surge/Chuggles
• Lack of Power, Sluggishness, or
Sponginess
• Hesitation, Sag, Stumble
• Fuel Knock/Combustion Noise
• Poor Fuel Economy
• Excessive Smoke (Black Smoke)
• Excessive Smoke (W hite Smoke)
Did you find and correct the condition? 

System OK Go to Intermittent
Conditions



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6E-36 Engine Control System (4JH1)
Scan Tool Data List
The scan tool Data List contains all engine related
parameters that are available on the scan tool. Use the
scan tool 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.
The scan tool values from a properly running engine
may be used for comparison with the engine you are
diagnosing. The scan tool Data List represents values
that would be seen on a normal running engine.
Important:
A scan tool that displays faulty data should not be used.
The scan tool problem should be reported to the
manufacturer. Use of a faulty scan tool can result in
misdiagnosis and unnecessary parts replacement. Onl
y
the parameters listed below are referenced in this
service manual for use in diagnosis.


Scan Tool Parameter Units DisplayedTypical Data Value at
Engine Idle
Typical Data Value at 2000
RPM
Operating Conditions: Engine Idling or 2000 RPM / Engine Coolant Temperature is between 75-85 °C (167-185 °F) /
Accelerator Pedal is Constant / Park or Neutral / Accessories OFF / Vehicle Located at Sea Level
Ignition Switch On/Off On On
System Voltage V 11.0 – 15.0 11.0 – 15.0
ECM Main Relay On/Off On On
Engine Speed RPM 650 - 750 1950 – 2050
Desired Idle Speed RPM 700 700
Injection Pump Speed RPM 325 - 375 975 – 1025
Accelerator Pedal Position % 0.0 5.0 – 7.0
Idle Switch On/Off On Off
Intake Air Temperature °C/°F 20 – 40°C / 68 – 104°F 20 – 40°C / 68 – 104°F
Engine Coolant Temperature °C/°F 75 - 85 °C / 167 - 185 °F 75 - 85 °C / 167 - 185 °F
Fuel Temperature °C/°F 20 – 60°C / 68 – 140°F 20 – 60°C / 68 – 140°F
Barometric Pressure hPa Nearly 1010 hPa at sea level Nearly 1010 hPa at sea level
Vacuum Pressure Sensor hPa Nearly 2020 hPa at sea level Nearly 2020 hPa at sea level
Turbocharger Solenoid Command % 100% at sea level 100% at sea level
EGR Solenoid Command % Nearly 90% Nearly 90%
Mass Air Flow Sensor mg/strk
More than 430 mg/strk at sea
level (with EGR system)
More than 700 mg/strk at sea
level (without EGR system)
More than 430 mg/strk at sea
level (with EGR system)
More than 700 mg/strk at sea
level (without EGR system)
Desired Mass Air Flow mg/strk
More than 430 mg/strk at sea
level (with EGR system)
1500 mg/strk (without EGR
system)
More than 430 mg/strk at sea
level (with EGR system)
1500 mg/strk (without EGR
system)
Actual Injection Quantity mg/strk 6.0 – 9.0 7.0 – 11.0
Desired Injection Quantity mg/strk 6.0 – 9.0 7.0 – 11.0
Actual Injection Timing °CA 1.0 – 4.0 3.0 – 4.5
Desired Injection Timing °CA 1.0 – 4.0 3.0 – 4.5
Neutral Switch On/Off On On
Brake Pedal 1 Switch Applied/ ReleasedReleased Released
Brake Pedal 2 Switch Applied/ ReleasedReleased Released
Clutch Pedal Switch Applied/ ReleasedReleased Released
Vehicle Speed km/h / MPH 0 0

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