Isuzu NPR 4J Series User Manual

SERVICE INFORMATION 00 – 5
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 Possible cause Correction
Glow plug indicator
light does not turn on
Defective indicator light bulb Replace the indicator light bulb
Quick-on start timer Defective quick-on start timer Replace the quick-on start timer
Glow plug indicator
light turns on the 0.3
seconds
Defective quick-on start timer Replace the 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
Replace the quick-on start timer
Glow plug indicator
light turns on for 3.5
seconds
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
Replace the quick-on start timer
Thermoswitch Defective thermoswitch Replace the thermoswitch
Glow plug continuity No glow plug continuity Replace the glow plugs
GLOW PLUGS ARE NOT RECEIVING POWER
Glow plug indicator
light does not turn on
Broken indicator light fuse Replace the fuse
Quick-on start timer Defective quick-on start timer Replace the quick-on start timer

Isuzu NPR 4J Series Specifications

General

Brand	Isuzu
Model	NPR 4J Series
Category	Engine
Language	English