Isuzu 2008MY N Series Workshop Manual page 146

Step
Start the engine and wait until engine is fully warm
upped while observing the Coolant Temperature
parameter with a scan tool.
4
Does the scan tool indicate more than the
specified value?
Ask the driver if overheat is caused by low engine
coolant level, etc.
If engine overheat has experienced, the engine
5
must be inspected and repaired as necessary.
Did you complete the action?
1. Test the engine coolant temperature (ECT)
sensor at various temperature levels to
evaluate the possibility of a skewed sensor.
6
2. Replace the ECT sensor as necessary.
Did you find and correct the condition?
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 and wait until engine is fully
7
warm upped while observing the Coolant
Temperature parameter with a scan tool.
Does the scan tool indicate more than the
specified value?
Observe the DTC Information with a scan tool.
8
Are there any DTCs that you have not
diagnosed?
Action
all previously disconnected
Engine Control System (4HK1)
Value(s) Yes
110°C
(230°F)
Go to Step 6
—
Go to Step 7
—
Go to Step 7
110°C
(230°F)
Go to Step 2
—
Go to DTC List
1A-143
No
Go to Step 5
—
Go to Diagnostic
Aids
Go to Step 8
System OK