Isuzu KB P190. Manual - part 327

6E-274  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 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. 

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. 

• Improper mechanical timing  
• Improper valve gap 
• Broken or weak valve springs 
• Worn camshaft lobes 
• Inspect for any excessive fuel entering combustion chamber. 
• Inspect for coolant entering the combustion chamber. 

Electrical System Checks  

Inspect the engine electrical for the following conditions. Refer to the Engine Electrical 
section.  
• Inspect the glow plug control (preheating) system operation. 

 
 

Engine Control System (4JH1)  6E-275 

Repair Instructions 

Engine Control Module (ECM) Replacement

Engine Control Module (ECM) Replacement

Procedure 

Important: 

If the ECM is to be replaced the following programmed

contents MUST be reprogrammed into the new ECM. 

•  Vehicle identification number (VIN). 
•  Latest software/calibrations if released. Refer to

Service Programming System (SPS) Description

and Service Programming System (SPS) (Remote

Procedure) or Service Programming System (SPS)

(Pass-Thru Procedure) in this section  

 
Removal Procedure 

1.  Disconnect the negative battery cable. 

2.  Remove the seat left-hand side. 

3.  Roll up the floor carpet. 

4.  Remove four bolts from the ECM cover. 

5.  Disconnect the two connectors from the ECM. 

 

 

 

 

 

 

 

 

 

 

 

 
Installation Procedure 

1.  Connect the two connectors to the ECM. 

2.  Put on the ECM to the floor panel.  

3.  Tighten the ECM cover by four bolts with specified

tightening torque. 

 
Tightening torque 

•  Bolts: 8.0 - 12.0 N.m (0.8 - 1.2 kgf.m)  
4.  Lay the floor carpet exactly. 

5.  Put on the seat to the floor panel and tighten with

specified tightening torque.  

Tightening torque 

•  Bolts: 40.0 N.m (4.1 kgf.m)  
6.  Connect the negative battery cable. 

 

Vehicle Identification Number (VIN) Programming

Procedure 

Important: 

If the ECM from another vehicle is installed, VIN is not

programmed by the scan tool. Use the SPS to change

the original VIN. Refer to Service Programming System

(SPS) Description and Service Programming System

(SPS) (Remote Procedure) or Service Programming

System (SPS) (Pass-Thru Procedure) in this section.  

Important:  

If an updated software/calibrations is released, DO NOT

program the VIN now. The VIN is programmed at SPS

procedure. Refer to Service Programming System

(SPS) Description and Service Programming System

(SPS) (Remote Procedure) or Service Programming

System (SPS) (Pass-Thru Procedure) in this section.  

 

6E-276  Engine Control System (4JH1) 

1.  Connect the scan tool to the vehicle DLC, with the

engine 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 or

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 Only

Memory (EEPROM). 

  This type of memory allows selected portions of

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 of

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: 

•  When a service procedure instructs you to replace

the ECM. When the ECM from another vehicle is

installed, VIN must be changed. And change

vehicle information as necessary such as type of

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 computer

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 but

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 or

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 or

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 of

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 

 

Engine Control System (4JH1)  6E-277 

• DO NOT disturb the tool harnesses while

programming. If an interruption occurs during the 

programming procedure, programming failure or

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 fully

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 battery

is fully charged before programming.  

a.  Connect the scan tool to the vehicle data link

connector (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 or

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 Select

Diagnostic Tool and Programming Process

screen: 

•  Select Diagnostic Tool-Select scan tool. 
• Select Programming Process-Identify

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 for

Communication screen and select Next. 

g. 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 not

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