Isuzu NKR 4J Series - QOS-III Preheating System; Section 6 D7 QOSIII Preheating System; General Description

QOSIII PREHEATING SYSTEM 6D7 – 1
SECTION 6D7
QOSIII PREHEATING SYSTEM
(4JG2 ONLY)
CONTENTS
PAGE
General Description....................................................................................................... 6D7 - 1
System Diagram............................................................................................................. 6D7 -2
Inspection on QOS III system Operation ..................................................................... 6D7 - 5
GENERAL DESCRIPTION
QOS III 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,
thermosensor, vehicle speedsensor, dropping resistor,
relay (2 pcs), and temperature self-control type 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.
The afterglow time function is controlled by
thermosensor, vehicle speed sensor, and the engine
runstall sensor (charge relay).