Isuzu KB P190. Manual - part 821

Engine Management – V6 – Diagnostics 

Page 6C1-2–6 

 

• 

Use Tech 2 to clear DTC/s. 

Type C – Non-Emission Related DTCs 

The ECM takes the following action when a Type A DTC runs and fails: 

• 

sets a current Type C DTC that represents the fault condition, and 

• 

records the operating conditions at the time the DTC is logged and stores this information in the Failure Record, 
and: 

N O T E  

The instrument cluster malfunction indicator lamp 
(MIL) is not activated when a Type C DTC sets. 

Conditions for Clearing Type C DTCs 

• 

The current DTC clears when there is no fault condition in the current ECM self-diagnostics. 

• 

Type C History DTC clears when there is no fault condition after 40 consecutive warm-up cycles. 

• 

Use Tech 2 to clear DTCs. 

Current DTCs 

A DTC is a Current DTC if the fault condition that triggers that DTC is present during the last ECM self-diagnostics. 

History DTCs 

A DTC is a History DTC if the fault condition that triggers that DTC is not present during the last ECM self-diagnostics. 

1.5 

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: 

Engine Management – V6 – Diagnostics 

Page 6C1-2–7 

 

• 

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, 

• 

Give insight into the reasons for performing a procedure in the recommended manner, and / or 

• 

Present information that gives the technician the benefit of past experience in accomplishing a procedure with 
greater ease. 

 

Engine Management – V6 – Diagnostics 

Page 6C1-2–8 

 

2 

GM LAN Serial Communication 
Circuit 

 

Figure 6C1-2 – 1 

Engine Management – V6 – Diagnostics 

Page 6C1-2–9 

 

3 

Wiring Diagrams and Connector 
Charts 

3.1 Wiring 

Diagrams 

 

Figure 6C1-2 – 2