Isuzu KB P190. Manual - part 882

Engine Management – V6 – Service Operations 

Page 6C1-3–4 

 

1 General 

Information 

1.1 General 

Description 

This Section describes the correct service procedures to repair and test components of the V6 engine management 
system. Emphasis is placed on the proper procedures and repair of components related to this specific system. 

For component description, operation and location, refer to 6C1-1 Engine Management – V6 – General Information. 

Engine cylinder identification follows the international 
standard OBD II. This standard calls for the engine cylinder 
bank number one to be identified by the location of cylinder 
number one. Therefore the numbering for the V6 engine is:

• 

1, 3, 5 – Right-hand side (Bank 1). 

• 

2, 4, 6 – Left-hand side (Bank 2). 

The engine firing order is 1, 2, 3, 4, 5, 6. 

Figure 6C1-3 – 1 

1.2 

Service Precautions and Requirements 

Service Precautions 

 

The following safety and precautionary 
directions must be followed when servicing 
the engine management system otherwise 
personal injury and / or improper system 
operation may occur: 

• 

If working on a vehicle which has been subjected to an under bonnet thermal incident (fire), wear appropriate 
protective clothing to prevent personal injury. Components that contain fluoro-elastomer may produce a corrosive 
bi-product when subjected to extreme heat. 

• 

Disconnection of the battery affects certain vehicle electronic systems. Refer to the battery disconnection 
procedure in 6D1-3 Battery – V6 before disconnecting the battery. 

• 

Disconnect the battery negative lead when performing the following procedures: 

• 

disconnecting the engine control module (ECM) connectors, or 

• 

charging the battery. 

• 

Disconnect the battery negative lead and the ECM connectors before attempting any electric welding on the vehicle. 

• 

Do not start the engine if the battery terminal is not properly secured to the battery. 

• 

Do not disconnect or reconnect the following while the ignition is switched on or when the engine is running: 

• 

any engine management system component wiring connector, or 

• 

battery terminal leads. 

Engine Management – V6 – Service Operations 

Page 6C1-3–5 

 

• 

Ensure the correct procedure for disconnecting and connecting engine management system wiring connectors is 
always followed. 

• 

Ensure that all wiring connectors are fitted correctly. 

• 

The engine management system wiring connectors are designed to fit only one way; there are indexing tabs and 
slots on both halves of the connector. Forcing the connector into place is not necessary if it is being installed with 
the correct orientation. Failure to take care to match the indexing tabs and slots correctly can cause damage to the 
connector, the module, or other vehicle components or systems. 

• 

Never touch the connector pins of any electronic component, such as an ECM, as electrostatic discharge (ESD) 
damage may result. 

• 

When steam or pressure cleaning engines, do not direct the cleaning nozzle at engine management system 
components. 

• 

Never subject the ECM to temperatures less than -40

° C and greater than 125° C. 

• 

Prior to disconnection or removal of any components associated with the fuel system, clean the area around any 
connection points to avoid possible contamination of the fuel system.  

• 

A depressurised fuel system contains fuel in the fuel system and fuel lines that can be spilled during service 
operations. To reduce the chance of personal injury, cover the fittings with a shop towel to absorb any fuel spillage 
prior to performing the service operation. Once the service operation has been completed, place the towel in an 
approved container for disposal. 

• 

To avoid accidental fuel discharge, it is advisable to disconnect the battery and remove the fuel pump relay if the 
fuel line between the fuel pump and the fuel rail is to be disconnected / open for an indefinite period.  

• 

Always tighten fasteners to the correct tightening torque, and where indicated in the service procedure, follow the 
correct tightening sequence, precautions and recommendations to prevent premature failure of the fastener or 
component. 

• 

After removing components, such as the upper or lower intake manifold, front engine pipe, heated oxygen sensor, 
etc. always plug any openings to prevent dirt and other contaminants from entering. 

• 

Do not use silicone based assembly lubricants as damage to the heated oxygen sensors may result. 

 

Use of incorrect electrical test equipment 
when performing engine management service 
procedures could result in incorrect results or 
component damage. 

• 

Use only the test equipment specified in the diagnostic tables. Use of other test equipment may either give 
incorrect results or damage serviceable components, refer to, 6C1-2 Engine Management – V6 – Diagnostics. 

• 

After completing the required service operations, road test the vehicle to ensure correct engine management 
system operation.  

Service Requirements 

Basic Knowledge Required 

 

A lack of basic understanding of electronics, 
electrical wiring circuits and use of electrical 
circuit testing tools when performing certain 
service procedures could result in incorrect 
results or damage to components. 

In addition, a general understanding of the engine management system and its component operation is essential to 
prevent misdiagnosis and component damage. 

Engine Management – V6 – Service Operations 

Page 6C1-3–6 

 

Basic Diagnostic Tools Required 

 

Use of incorrect electrical circuit diagnostic 
tools when performing certain service 
procedures could result in incorrect 
diagnostic results or damage to components. 

The following electrical circuit testing tools are required to perform the diagnostic procedures detailed in this Section: 

• 

Test lamp, refer to 8A Electrical – Body and Chassis for further information. 

• 

Digital multimeter with 10 M

Ω ohms impedance, refer to 8A Electrical – Body and Chassis for further information. 

• 

Connector test adapter kit Tool No. J35616-A. 

1.3 

Service Operations Not Covered In This 
Section 

There are situations where components and/or procedures related to the powertrain management system are covered in 
other Sections of the service documentation. To aid technicians in locating the necessary service procedures for these 
components and/or procedures, refer to the stated references. 

Air-conditioning System 

For A/C pressure switch replacement procedure, refer to 2A Heater and Air-conditioning. 

Electrical Components 

For the following electrical system component replacement procedures, refer to the appropriate Sections as follows: 

• 

Extended brake pedal travel switch and stop lamp switch service operations, refer to 5C Brakes. 

• 

Fuse and relay locations, refer to 8A Electrical-Body and Chassis. 

• 

Cruise control switch assembly service operations, refer to 8C Cruise Control – HFV6. 

• 

Powertrain interface module PIM removal and installation procedure, refer to 6E1 Powertrain Interface Module – V6. 

• 

Neutral start and back-up lamp switch, refer to 7C4 Automatic Transmission – 4L60E – On-vehicle Servicing. 

• 

Vehicle speed sensor service operations, refer to:  

− 

7C4 Automatic Transmission – 4L60E – On-vehicle Servicing 

− 

7B1 Manual Transmission – V6  

Fuel System 

For the following fuel system component replacement procedures, refer to 6C Fuel System – V6. 

• 

Fuel system cleaning, 

• 

Fuel system leak and pressure test, 

• 

Fuel feed hose to fuel rail replacement, 

• 

Fuel line quick connect fittings, 

• 

Evaporative emission control canister, 

• 

Fuel filter, 

• 

Fuel hose / pipes layout, 

• 

Fuel pump motor assembly and fuel pressure regulator assembly, 

• 

Fuel sender assembly service operations. 

Engine Management – V6 – Service Operations 

Page 6C1-3–7 

 

Transmission – Automatic 

For automatic transmission sensors and components, refer to 7C4 Automatic Transmission – 4L60E – On-vehicle 
Servicing. 

Transmission – Manual 

For manual transmission sensors and other components, refer to 7B1 Manual Transmission – V6. 

1.4 

Warning Caution and Notes 

This Section contains various WARNINGS, CAUTIONS and NOTE statements that you must observe carefully to reduce 
the risk of death or injury during service, repair procedures or vehicle operation. Incorrect service or repair procedures 
may damage the vehicle or cause operational faults. WARNINGS, CAUTION and NOTE statements are not exhaustive. 
GM Holden LTD can not possibly warn of all the potentially hazardous consequences of failure to follow these 
instructions. 

Definition of WARNING, CAUTION and NOTE Statements 

 

Diagnosis and repair procedures in this Section contain both general and specific WARNING, CAUTION and NOTE 
statements. GM Holden LTD is dedicated to the presentation of service information that helps the technician to diagnose 
and repair the systems necessary for proper operation of the vehicle. Certain procedures may present a hazard to the 
technician if they are not followed in the recommended manner. WARNING, CAUTION and NOTE statements are 
designed to help prevent these hazards from occurring, but not all hazards can be foreseen. 

WARNING defined 

A WARNING statement immediately precedes an operating procedure or maintenance practice which, if not correctly 
followed, could result in death or injury. A WARNING statement alerts you to take necessary action or not to take a 
prohibited action. If a WARNING statement is ignored, the following consequences may occur: 

• 

Death or injury to the technician or other personnel working on the vehicle, 

• 

Death or injury to other people in or near the workplace area, and / or 

• 

Death or injury to the driver / or passenger(s) of the vehicle or other people, if the vehicle has been improperly 
repaired. 

CAUTION defined 

A CAUTION statement immediately precedes an operating procedure or maintenance practice which, if not correctly 
followed, could result in damage to or destruction of equipment, or corruption of data. If a CAUTION statement is ignored, 
the following consequences may occur: 

• 

Damage to the vehicle, 

• 

Unnecessary vehicle repairs or component replacement, 

• 

Faulty operation or performance of any system or component being repaired, 

• 

Damage to any system or components which depend on the proper operation of the system or component being 
repaired, 

• 

Faulty operation or performance of any systems or components which depend on the proper operation or 
performance of the system or component under repair, 

• 

Damage to fasteners, basic tools or special tools and / or 

• 

Leakage of coolant, lubricant or other vital fluids. 

NOTE defined 

A NOTE statement immediately precedes or follows an operating procedure, maintenance practice or condition that 
requires highlighting. A NOTE statement also emphasises necessary characteristics of a diagnostic or repair procedure. 
A NOTE statement is designed to: 

• 

Clarify a procedure, 

• 

Present additional information for accomplishing a procedure,