Isuzu 2008MY N Series Workshop Manual page 310

Step
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.
5. Fully turn the idle up sensor between lowest
19
position (full counterclockwise direction) and
highest position (full clockwise direction) while
observing the Idle Up Sensor parameter with a
scan tool.
Does the scan tool indicate within the
specified value during turning the sensor?
Observe the DTC Information with a scan tool.
20
Are there any DTCs that you have not
diagnosed?
Action
all previously disconnected
Engine Control System (4HK1)
Value(s) Yes
0.2 to 4.8
volts
Go to Step 20
—
Go to DTC List
1A-307
No
Go to Step 3
System OK