Isuzu 2008MY N Series Workshop Manual page 283

1A-280 Engine Control System (4HK1)
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.
12
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.
13
Are there any DTCs that you have not
diagnosed?
Circuit/ System Testing DTC P2229
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.
4. Observe the Barometric Pressure (BARO)
2
Sensor parameter with a scan tool.
Is the BARO Sensor parameter more than the
specified value?
Monitor the DTC Information with a scan tool.
3
Is DTC P0651 also set?
1. Turn OFF the ignition.
2. Disconnect
connector.
4
3. Turn ON the ignition, with the engine OFF.
Is the BARO Sensor parameter less than the
specified value?
1. Turn OFF the ignition.
2. Disconnect
connector.
5
3. Turn ON the ignition, with the engine OFF.
Is the BARO Sensor parameter less than the
specified value?
Connect a test lamp between the low reference
circuit (pin 1 of B-121) and battery voltage.
6
Does the test lamp illuminate?
Action
all previously disconnected
within the conditions
Action
the BARO sensor
the BARO sensor
Value(s)
—
that you
—
Value(s)
—
4.0 volts
—
harness
0.1 volts
harness
0.1 volts
—
Yes
Go to Step 3
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 DTC P0651
Go to Step 6
Go to Step 9
No
Go to Step 13
System OK
No
Aids
Go to Step 5
Go to Step 7
Go to Step 7
Go to Step 8