Isuzu N 2008 Series Workshop Manual page 162

Step
1. Turn OFF the ignition.
2. Disconnect the EGR valve harness connector.
3. Inspect for
connections and corrosion at the harness
connector of the EGR valve (pins 1, 2, 3, 4, 5,
6, 7 and 8 of E15).
4. Disconnect the ECM harness connector.
5. Inspect for
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connections and corrosion at the harness
connector of the ECM (pins 87, 93, 94, 99,
101, 103, 110 and 111 of E12).
6. Test for an open circuit or high resistance on
each circuit.
7. Repair the connection(s) or circuit(s) as
necessary.
Did you find and correct the condition?
1. Test the solenoid circuits between the ECM
(pins 103, 110 and 111 of E12) and the EGR
valve (pins 6, 7 and 8 of E15) for the following
conditions:
• A short to ground
• A short to battery or ignition voltage
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• A short circut each other
• A short to the EGR position sensor
circuit(s)
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
Replace the EGR valve. Refer to EGR Valve and
EGR Cooler in Section 1F Emission Control.
7
Did you complete the replacement?
1. Reconnect
harness connector(s).
Notice: A history DTC will not clear. (Euro 4
specification)
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
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4. Start the engine.
5. Operate the vehicle within the Conditions for
Running the DTC. You may also operate the
vehicle within
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition?
Important: Replacement
programmed and learned.
9
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
Action
an intermittent, for
an intermittent, for
all previously disconnected
the conditions that
ECM must
Engine Control System (4JJ1)
Value(s)
poor
poor
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you
be
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Yes
Go to Step 8 Go to Step 6
Go to Step 8 Go to Step 7
Go to Step 8
Go to Step 9 Go to Step 11
Go to Step 10
1A-159
No
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