Isuzu N 2008 Series Workshop Manual page 250

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. Fully depress and release the accelerator
pedal while observing the APP Sensor 1
parameter with the scan tool.
Does the scan tool indicate less than the specified
value during depressing or releasing the pedal?
Observe the DTC Information with a scan tool.
13
Are there any DTCs that you have not diagnosed?
Circuit/ System Testing DTC P2128
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. Fully depress and release the accelerator
2
pedal while observing the Accelerator Pedal
Position (APP) Sensor 2 parameter with a
scan tool.
Does the scan tool indicate more than the specified
value during depressing or releasing the pedal?
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 APP Sensor 2 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 APP Sensor 2 parameter less than the
specified value?
Connect a test lamp between the low reference
circuit (pin 3 of B5) and battery voltage.
6
Does the test lamp illuminate?
Action
all previously disconnected
Action
the APP sensor harness
the APP sensor harness
Engine Control System (4JJ1)
Value(s) Yes
0.2 volts
Go to Step 3
—
Go to DTC List
Value(s) Yes
—
Go to Step 2
4.9 volts
Go to Step 3
—
Go to Step 4
0.1 volts
Go to DTC P0651
0.1 volts
Go to Step 6
—
Go to Step 9
1A-247
No
Go to Step 13
System OK
No
Go to Diagnostic
System Check -
Engine Controls
Go to Diagnostic
Aids
Go to Step 5
Go to Step 7
Go to Step 7
Go to Step 8