Isuzu N 2008 Series Workshop Manual page 68

Step
Repair the open circuit or high resistance between
the ECM Main (10A) fuse and the exhaust throttle
solenoid valve (pin 2 of J59). Check the ECM Main
6
(10A) fuse first.
Did you complete the repair?
1. Test the control circuit between the ECM (pin
102 of E12) and the solenoid valve (pin 1 of
J59) 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 E12) and the solenoid valve (pin 1 of
J59) 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 a poor
connection at the harness connector of the
solenoid valve (pin 1 and 2 of J59).
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 a poor
connection at the harness connector of the
10
ECM (pin 102 of E12).
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. Perform the Exhaust Throttle Control with a
13
scan tool.
4. Command the solenoid valve ON and OFF.
Does the solenoid valve click with each command?
Observe the DTC Information with a scan tool.
14
Are there any DTCs that you have not diagnosed?
Circuit/ System Testing DTC P0080
Step
Did you perform the Diagnostic System Check -
1 Engine Controls?
Action
Replacement ECM
Action
Value(s)
—
—
—
—
—
—
must be
—
—
—
Value(s)
—
Engine Control System (4JJ1)
Yes
Go to Step 13
Go to Step 13
Go to Step 13
Go to Step 13
Go to Step 13
Go to Step 13
Go to Step 13
Go to Step 14
Go to DTC List
Yes
Go to Step 2
1A-65
No
—
Go to Step 10
Go to Step 12
Go to Step 11
Go to Step 12
—
—
Go to Step 3
System OK
No
Go to Diagnostic
System Check -
Engine Controls