Isuzu N 2008 Series Workshop Manual page 134

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. Refer
to ECT Sensor in Section 1C Engine Cooling.
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.
7 4. Start the engine and wait until engine is fully
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 (4JJ1)
Value(s)
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
Yes No
Go to Step 5
—
Go to Diagnostic
Aids
Go to Step 8
System OK
1A-131