Quick-On Start System - Isuzu NHR 4J Series Workshop Manual

4. QUICK-ON START SYSTEM

PREPARATION
1 Disconnect the thermoswitch connector.
2. Determine whether or not the glow plugs are receiving power.
a) Make sure that the starter switch is "OFF".
b) Connect a voltmeter between one of the glow plugs and the cylinder wall.
c) Move the starter switch to the "ON" position.
The voltmeter needle will show the souse voltage (12V) if the glow plugs are receiving power.
If the voltmeter needle does not move, the glow plugs are not receiving power.
3. Perform the troubleshooting procedure.
GLOW PLUGS ARE RECEIVING POWER
Checkpoint
Glow plug indicator
light does not turn on
Quick-on start timer
Glow plug indicator
light turns on the 0.3
seconds
Glow plug indicator
light turns on for 3.5
seconds
Thermoswitch
Glow plug continuity
GLOW PLUGS ARE NOT RECEIVING POWER
Glow plug indicator
light does not turn on
Quick-on start timer
Possible cause
Defective indicator light bulb
Defective quick-on start timer
Defective quick-on start timer
Return the starter switch to the "ON" position
from the "START" position after the engine
starts if the glow plug relay remains on less
than 14 seconds, the quick-on start timer is
defective
Move the starter switch from the "OFF"
position to the "ON" position if the glow plug
relay remains on less than 14 seconds, the
quick-on start timer is defective
Defective thermoswitch
No glow plug continuity
Broken indicator light fuse
Defective quick-on start timer
SERVICE INFORMATION 00 – 5
Correction
Replace the indicator light bulb
Replace the quick-on start timer
Replace the quick-on start timer
Replace the quick-on start timer
Replace the quick-on start timer
Replace the thermoswitch
Replace the glow plugs
Replace the fuse
Replace the quick-on start timer