Isuzu 2008MY N Series Workshop Manual page 75

1A-72 Engine Control System (4HK1)
Step
Does the test lamp remain illuminated with
5
each command?
Repair the open circuit or high resistance between
the ECM MAIN (15A) fuse and the exhaust throttle
solenoid valve (pin 1 of J-59). Check the ECM
6
MAIN (15A) fuse first.
Did you complete the repair?
1. Test the control circuit between the ECM (pin
102 of E-12) and the solenoid valve (pin 1 of
J-59) for an open circuit or high resistance.
7
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Test the control circuit between the ECM (pin
102 of E-12) and the solenoid valve (pin 1 of
J-59) for a short to ground.
8
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Inspect for an intermittent and for poor
connection at the harness connector of the
solenoid valve (pin 1 and 2 of J-59).
9
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 poor
connection at the harness connector of the
10
ECM (pin 102 of E-12).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
Replace the exhaust throttle solenoid valve.
11
Did you complete the replacement?
Important:
programmed and learned.
12
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
1. Reconnect all previously disconnected fuse or
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
13
4. Turn ON the ignition, with the engine OFF.
5. Monitor the DTC information with a scan tool.
Did the DTC fail this ignition?
Observe the DTC Information with a scan tool.
14
Are there any DTCs that you have not
diagnosed?
Action
Replacement ECM
Value(s)
—
—
—
—
—
—
—
must be
—
—
—
Yes
Go to Step 8 Go to Step 7
Go to Step 13
Go to Step 13 Go to Step 10
Go to Step 13 Go to Step 12
Go to Step 13 Go to Step 11
Go to Step 13 Go to Step 12
Go to Step 13
Go to Step 13
Go to Step 3 Go to Step 14
Go to DTC List
No
—
—
—
System OK