Isuzu N 2008 Series Workshop Manual page 308

Step
Replace the glow relay.
14
Did you complete the replacement?
Replace the appropriate glow plug.
15
Did you complete the replacement?
1. Reconnect
components,
connector(s).
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the metal bus
bar (glow plug power supply E14 connector)
16
and a known good ground.
5. Perform the Glow Relay Control with a scan
tool.
6. Command the relay ON while observing the
test lamp.
Does the test lamp turn ON only when commanded
ON?
Action
all previously disconnected
relay, fuse or harness
Engine Control System (4JJ1)
Value(s) Yes
—
Go to Step 16
—
Go to Step 16
—
Go to Step 4
1A-305
No
—
—
Go to Step 2