Isuzu 2008MY N Series Workshop Manual page 276

Step
1. Inspect for an intermittent and for poor
connections at the in-line harness connector.
2. Disconnect the ECM harness connector.
3. Inspect for an intermittent and for a poor
connection at the harness connector of the
ECM.
9
4. Inspect for an open circuit or high resistance
on the charge voltage circuit between the
ECM and the in-line harness connector.
5. Repair the connection(s) or circuit(s) as
necessary.
Did you find and correct the condition?
1. Remove the cylinder head cover. Refer to
Cylinder Head Cover in Section 1B Engine
Mechanical.
2. Inspect the fuel injector harness for loose
injector terminal nuts, objects touching injector
10 terminals.
3. Inspect for an intermittent and for poor
connections at the in-line harness connector.
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
Measure insulation resistance of the cylinder #2
and #3 fuel injector between each fuel injector
terminal and a known good ground.
11
Is the resistance more than the specified
value?
Repair or replace the fuel injector harness.
12
Did you complete the repair or replace?
Important: Replacement
programmed.
Replace the appropriate fuel injector that was less
13
insulation resistance found at Step 11. Refer to
Injector in Section 1D Engine Fuel.
Did you complete the replacement?
Important: Replacement
programmed and learned.
14
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
1. Reconnect
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
15 Operate the vehicle within the Conditions for
Running the DTC. You may also operate the
vehicle within
observed from the Freeze Frame/Failure
Records.
Did the DTC fail this ignition?
Action
injector must
ECM must
all previously disconnected
the conditions that
Engine Control System (4HK1)
Value(s)
—
—
1MΩ
—
be
—
be
—
—
you
Yes
Go to Step 15 Go to Step 10
Go to Step 15 Go to Step 11
Go to Step 12 Go to Step 13
Go to Step 15
Go to Step 15
Go to Step 15
Go to Step 3 Go to Step 16
1A-273
No
—
—
—