2007 ISUZU KB P190 Engine

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Page 3372 of 6020

ISUZU KB P190 2007  Workshop Repair Manual Engine Management – V6 – Diagnostics Page 6C1-2–94 
 
9 1  The HO2S is detecting a rich or lean exhaust 
condition or may be contaminated. Inspect for  
one of the following conditions:  
•  H

Page 3373 of 6020

ISUZU KB P190 2007  Workshop Repair Manual Engine Management – V6 – Diagnostics Page 6C1-2–95 
 
16 1  Using Tech 2, select the DTC display function.  
Does Tech 2 display any DTCs?  — 
Go to the 
appropriate DTC  Table in this  Sectio

Page 3374 of 6020

ISUZU KB P190 2007  Workshop Repair Manual Engine Management – V6 – Diagnostics Page 6C1-2–96 
 
• Since fault condition in a wiring connector may trigger DTCs, always test the connectors related to this diagnostic  
procedure for shor

Page 3375 of 6020

ISUZU KB P190 2007  Workshop Repair Manual Engine Management – V6 – Diagnostics Page 6C1-2–97 
 
Step Action  Yes 
No 
8 Test the EOT sensor low reference circuit for a high resistance and  
open circuit fault condition. Refer to 8A Elec

Page 3376 of 6020

ISUZU KB P190 2007  Workshop Repair Manual Engine Management – V6 – Diagnostics Page 6C1-2–98 
 
• DTC P0268 – Injector 3 Control Circuit High Voltage 
•  DTC P0270 – Injector 4 Control Circuit Low Voltage 
•  DTC P0271 – Inj

Page 3377 of 6020

ISUZU KB P190 2007  Workshop Repair Manual Engine Management – V6 – Diagnostics Page 6C1-2–99 
 
Test Description 
The following numbers refer to the step numbers in the diagnostic table:  
3  Determines if there is a fault condition in

Page 3378 of 6020

ISUZU KB P190 2007  Workshop Repair Manual Engine Management – V6 – Diagnostics Page 6C1-2–100 
 
Step Action  Yes No 
7 1  Remove the upper intake manifold. Refer to 6A1-Engine 
Mechanical – V6. 
2  Test the control circuit and the ig

Page 3379 of 6020

ISUZU KB P190 2007  Workshop Repair Manual Engine Management – V6 – Diagnostics Page 6C1-2–101 
 
Conditions for Setting the DTC 
The ECM detects an engine speed in excess of 7200 RPM for 1 second or longer. 
Conditions for Clearing the