Isuzu 2008MY N Series Workshop Manual page 140

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.
17
5. Operate the vehicle within the Conditions for
Running the DTC. You may also operate the
vehicle
observed from the Freeze Frame/Failure
Records.
Did the DTC fail this ignition?
Observe the DTC Information with a scan tool.
18
Are there any DTCs that you have not
diagnosed?
Circuit/ System Testing DTC P0203
Step
Did you perform the Diagnostic System Check
1
- Engine Controls?
1. Install a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
2
4. Monitor the DTC Information with a scan tool.
Does the DTC fail this ignition?
1. Turn OFF the ignition.
2. Disconnect the in-line harness connector from
the cylinder head cover case.
3. Measure the resistance of the charge voltage
circuit across the female side connector.
3
4. Measure the resistance of the charge voltage
circuit across the male side connector.
Are both resistance readings less than the
specified value (either of reading is out of
specified value will not set this DTC)?
1. Connect a DMM between the cylinder #3
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 #3 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?
Action
all previously disconnected
within the conditions
Action
Engine Control System (4HK1)
Value(s)
—
that you
—
Value(s)
—
—
1.0Ω
1.0 volt
16.0 volts
12.0 volts
Yes
Go to Step 3 Go to Step 18
Go to DTC List
Yes
Go to Diagnostic
System Check -
Go to Step 2 Engine Controls
Go to Diagnostic
Go to Step 3
Go to Step 4 Go to Step 9
Go to Step 5 Go to Step 10
Go to Step 6 Go to Step 11
Go to Step 7 Go to Step 12
1A-137
No
System OK
No
Aids