Isuzu N 2008 Series Workshop Manual page 216

Step
1. Turn OFF the ignition for 30 seconds.
2. Replace the ECM main relay with the glow
relay or replace with a known good relay.
4
3. Turn ON the ignition, with the engine OFF.
Does the DTC fail?
Repair the short to battery on the battery voltage
feed circuits between the ECM (pins 2 and 5 of
5
J14) and the ECM main relay (pin 2 of X18)
Did you complete the repair?
Repair the short to battery on the battery voltage
supply circuits between the ECM (pins 21 and 40 of
6
J14) and the ECM main relay (pin 3 of X18)
Did you complete the repair?
Replace the ECM main relay.
7
Did you complete the replacement?
1. Reconnect all previously disconnected relay
or harness connector(s).
2. Clear the DTCs with a scan tool.
8
3. Turn OFF the ignition for 30 seconds.
4. Turn ON the ignition.
Did the DTC fail this ignition?
Observe the DTC Information with a scan tool.
9
Are there any DTCs that you have not diagnosed?
Action
Engine Control System (4JJ1)
Value(s) Yes
—
Go to Step 6
—
Go to Step 8
—
Go to Step 8
—
Go to Step 8
—
Go to Step 3
—
Go to DTC List
1A-213
No
Go to Step 7
—
—
—
Go to Step 9
System OK