Isuzu N 2008 Series Workshop Manual page 219

1A-216 Engine Control System (4JJ1)
Step
1. Test the 5 volts reference circuit 3 between the
ECM (pin 80 of J14) and the exhaust
differential pressure sensor (pin 3 of J33) for a
short to battery or ignition voltage.
2. Test the 5 volts reference circuit 4 between the
ECM (pin 95 of E12) and the following
components for a short to battery or ignition
voltage.
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• CKP sensor (pin 3 of E20)
• Boost pressure sensor (pin 3 of E24)
• Intake throttle position sensor (pin 6 of
E16)
• Vacuum pressure sensor (pin 3 of E34)
3. Repair the circuit(s) as necessary.
Did you find and correct the condition?
Replace the boost pressure sensor. Refer to Boost
Pressure Sensor in Section 1J Induction.
11
Did you complete the replacement?
Replace the intake throttle valve. Refer to Intake
Throttle Valve in Section 1B Engine Mechanical.
12
Did you complete the replacement?
Replace the CKP sensor. Refer to CKP Sensor in
Section 1B Engine Mechanical.
13
Did you complete the replacement?
Replace the vacuum pressure sensor. Refer to
Vacuum Pressure Sensor in Section 1J Induction.
14
Did you complete the replacement?
Important: Replacement
pressure sensor must be learned.
Replace the exhaust differential pressure sensor.
15
Refer to Exhaust Differential Pressure Sensor in
Section 1G Engine Exhaust.
Did you complete the replacement?
Important:
programmed and learned.
16
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
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?
Action
exhaust
Replacement ECM
all previously disconnected
within the conditions
Value(s)
—
—
—
—
—
differential
—
must be
—
—
that you
—
Yes
Go to Step 17 Go to Step 16
Go to Step 17
Go to Step 17
Go to Step 17
Go to Step 17
Go to Step 17
Go to Step 17
Go to Step 3 Go to Step 18
Go to DTC List
No
—
—
—
—
—
—
System OK