Isuzu 2008MY N Series Workshop Manual page 136

Step
1. Connect a DMM between the cylinder #1
charge voltage circuit and a known good
ground.
4
2. Turn ON the ignition, with the engine OFF.
Is the DMM voltage less then the specified
value?
Connect a DMM between the cylinder #1 solenoid
control circuit and a known good ground.
5
Is the DMM voltage less than the specified
value?
Is the DMM voltage more than the specified
6
value at Step 5?
1. Inspect for an intermittent and for poor
connections at the in-line harness connector.
7
2. Repair the connection(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
terminals.
8
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?
Repair the open circuit or high resistance on the
charge voltage circuits between the ECM and the
in-line harness connector, then between the in-line
9
harness connector and the fuel injector terminal.
Did you complete the repair?
1. Test the control circuit between the ECM and
the in-line harness connector for a short to the
common 1 charge voltage circuit.
10
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Test the control circuit between the ECM and
the in-line harness connector for a short to
battery or ignition voltage.
11
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Test the control circuit between the ECM and
the in-line harness connector for an open
circuit or high resistance.
12
2. Repair the connection(s) as necessary.
Did you find and correct the condition?
Action
Engine Control System (4HK1)
Value(s) Yes
1.0 volt
Go to Step 5
16.0 volts
Go to Step 6
12.0 volts
Go to Step 7
—
Go to Step 17
—
Go to Step 17
—
Go to Step 17
—
Go to Step 17
—
Go to Step 17
—
Go to Step 17
1A-133
No
Go to Step 10
Go to Step 11
Go to Step 12
Go to Step 8
Go to Step 13
—
Go to Step 15
Go to Step 15
Go to Step 14