Isuzu NPR 4J Series - QOS-II Preheating System

QOSII PREHEATING SYSTEM 6D6 – 1
SECTION 6D6
QOSII PREHEATING SYSTEM
(4JB1/4JB1T/4JB1TC ONLY)
CONTENTS
PAGE
General Description....................................................................................................... 6D6 - 1
System Diagram............................................................................................................. 6D6 -2
Inspection on QOS II system Operation ...................................................................... 6D6 - 3
QOSII System Troubleshooting.................................................................................... 6D6 - 4
GENERAL DESCRIPTION
QOS II preheating system features a quick-on glow
plug with thermometer control of the glowing time and
the afterglow time function.
The system consists of a controller, indicator lamp,
thermoswitch, relay, and glow plug ( 4 pcs).
With the employment of the thermoswitch, the glow
time changes according to the engine coolant
temperature, thus allowing optimum starting conditions
to be obtained.