Isuzu N 2008 Series Workshop Manual page 36

Step
Attempt to start the engine.
4
Does the engine start and idle?
Does the scan tool display ECM DTCs P0633,
P161B or U0167?
5
Select the DTC display function for the following
control modules:
• ECM
• Transmission control module (TCM) (Smoother
only)
6
• Electronic hydraulic control unit (EHCU) (If so
equipped)
• Immobilizer control unit (ICU) (If so equipped)
Does the scan tool display any DTCs?
Does the scan tool display DTCs which begin with
7 U or other control module communication fault
DTCs?
Does the scan tool display ECM DTCs P0601,
8
P0602, P0604, P0606, P060B or P1621?
Does the scan tool display ECM DTC P0563?
9
Is there any other code in any controller that has
10
not been diagnosed?
Is the customer's concern with the transmission?
11
Is the customer's concern with the anti-lock brake
system?
12
Is the customer's concern with the immobilizer
system?
13
Action
Engine Control System (4JJ1)
Value(s) Yes
—
Go to Step 6
—
Go to Applicable
DTC
—
Go to Step 7
— Go to Applicable
DTC
Go to Applicable
—
DTC
Go to Applicable
—
DTC
Go to Applicable
—
DTC
Go to Diagnostic
System Check -
Transmission
—
Controls in Setion
5A Transmission
Control System
Go to Diagnostic
System Check -
— ABS Controls in
Section 4C1 ABS/
ASR
Go to Diagnostic
System Check -
— Immobilizer
Controls in Section
9I Security and Lock
1A-33
No
Go to Engine
Cranks but Does
Not Run
Problem is relating
to starting system.
Refer to Starting
System in Section
1E Engine Electrical
Go to Step 11
Go to Step 8
Go to Step 9
Go to Step 10
Go to Step 11
Go to Step 12
Go to Step 13
Go to Step 14