Isuzu 2008MY N Series Workshop Manual page 273

1A-270 Engine Control System (4HK1)
Step
Connect a test lamp between the charge voltage
circuit and battery voltage.
5
Does the test lamp illuminate?
1. Test the control circuits between the ECM and
the in-line harness connector for a short to
ground.
• Cylinder #1: Between pin 119 of E-12
and 5 of H-70
6
• Cylinder #4: Between pin 117 of E-12
and 8 of H-70
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Test the charge voltage circuits between the
ECM and the in-line harness connector for a
short to battery or ignition voltage.
• Cylinder #1: Between pin 119 of E-12
and 5 of H-70
7
• Cylinder #4: Between pin 117 of E-12
and 8 of H-70
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Test the charge voltage circuits between the
ECM and the in-line harness connector for a
short to ground.
• Cylinder #1: Between pin 121 of E-12
and 1 of H-70
8
• Cylinder #4: Between pin 121 of E-12
and 4 of H-70
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
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
terminals.
10
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?
Action Value(s) Yes
—
Go to Step 8
—
Go to Step 15
—
Go to Step 15
—
Go to Step 15
—
Go to Step 15
—
Go to Step 15
No
Go to Step 9
Go to Step 14
Go to Step 14
Go to Step 14
Go to Step 10
Go to Step 11