Isuzu N 2008 Series Workshop Manual page 65

1A-62 Engine Control System (4JJ1)
Step
1. Turn OFF the ignition.
2. Connect a test lamp across the solenoid valve
harness connector (pins 1 and 2 of E13).
3. Start the engine, then stop the engine while
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observing the test lamp.
Does the test lamp turn ON when the engine is
started and OFF when the engine is stopped?
Repair the open circuit or high resistance on the
ignition voltage feed circuit between the ECM Main
(10A) fuse and the solenoid valve (pin 1 of E13).
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Check the ECM Main (10A) fuse first.
Did you complete the repair?
1. Test the control circuit between the ECM (pin
96 of E12) and the solenoid valve (pin 2 of
E13) for a short to ground.
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2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Test the control circuit between the ECM (pin
96 of E12) and the solenoid valve (pin 2 of
E13) for the following conditions:
• An open circuit
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• A short to battery or ignition voltage
• High resistance
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Inspect for an intermittent and for poor
connections at the harness connector of the
solenoid valve (pins 1 and 2 of E13).
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2. Repair the connection(s) as necessary.
Did you find and correct the condition?
1. Turn OFF the ignition.
2. Disconnect the ECM harness connector.
3. Inspect for an intermittent and for a poor
connection at the harness connector of the
10
ECM (pin 96 of E12).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
Replace the turbocharger nozzle control solenoid
valve.
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Did you complete the replacement?
Important:
programmed and learned.
12
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
Action
Replacement ECM
Value(s)
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must be
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Yes
Go to Step 9 Go to Step 8
Go to Step 13
Go to Step 13 Go to Step 12
Go to Step 13 Go to Step 10
Go to Step 13 Go to Step 11
Go to Step 13 Go to Step 12
Go to Step 13
Go to Step 13
No
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