Isuzu 4HL1 Workshop Manual page 202

Engine control system
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1A-200 Engine Control System
Test Description
3. When the flow damper has been working, it will be
returned to the ordinary condition only after left inactive
overnight.
Step
Perform the "On-Board Diagnostic (OBD)
System Check".
1
Was the OBD System Check performed?
Review the DTC.
1.
Using Tech 2, check and store the DTC.
2.
Clear the DTC.
2
3.
Bleed the air from the fuel system.
4.
Perform test run and review the DTC.
Is DTC227 detected?
1.
The flow damper may have been
working. Leave the vehicle inactive
overnight.
3
2.
Perform test run and review the DTC.
Is DTC227 detected?
Inspect the fuel system according to the
following procedures.
1.
Check the fuel filter for excessive
contamination and choke.
2.
Check high- and low-pressure pipes for
4
collapse, choke, and loose connection.
3.
Check the feed pipe in the fuel tank for
foreign materials.
Is the fuel system normal in condition?
Repair or replace the faulty portion(s).
5
Is the action complete?
Check injectors.
1.
Install Tech 2.
2.
Starter switch "ON", and display the
engine data.
6
3.
Start
the
"Cylinder (1-4) Compensation" display for
individual cylinders.
Is there cylinder(s) whose calibrated quantity
is larger or less than other cylinders?
Replace the faulty injector(s).
7
Is the action complete?
Action
engine
and
observe
Value(s)
the
Yes
Refer to OBD
System Check
Go to Step 2
and go to Step 2
Go to Step 3
Diagnostic Aids
Refer to Test
Go to Step 4
Go to Step 6
Go to Step 5
Go to Step 18
Go to Step 7
Go to Step 8
Go to Step 18
No
Refer to
Description

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