Isuzu N-Series. Service manual — part 414
6D6-2 QOS II PREHEATING SYSTEM
GENERAL DESCRIPTION
QOS II preheating system features a quick-on glow plug with thermometer control of the glowing time and the after-
glow time function.
The system consists of a timer, indicator lamp, thermosensor, relay and temperature self-control type glow plug (4
pcs).
With the employment of the thermosensor, 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.
QOS II PREHEATING SYSTEM 6D6-3
Component
Quick-On-Start II (QOS II)
N6A1664E
6D6-4 QOS II PREHEATING SYSTEM
STARTING CIRCUIT DIAGRAM (REFERENCE)
Component
N6A1092E
QOS II PREHEATING SYSTEM 6D6-5
Inspection and Repair
Make the necessary adjustments, repairs, and part re-
placements if excessive wear or damage is discovered
during inspection.
Quick-On-Start II (QOS II)
System
1. Disconnect the connector of the thermo switch.
2. Set the voltage meter in connection as shown in
the illustration.
3. Turn the key switch to “ON” position without engine
turned and check the following items.
When abnormal, check the QOS timer, the glow re-
lay and the thermo switch.
When normal, check the glow plug.
Timer
1. Disconnect the connector of the thermo switch.
2. Set the voltage meter in connection as shown the
illustration with connector connected.
3. Turn the key switch to “ON” position without engine
turned, and check the following.
Glow Plug Relay
Location
Specification
Measure the glow relay resistance between the terminal
(4) and the (5) with a circuit tester.
Glow Indicator Lighting Time
Seconds
Standard
3.5
Power Source Voltage Indi-
cating Time
Seconds
Standard
18
N6A1093E
N6A1094E
0 Volts Indicating Time
Seconds
Standard
18
N6A1095E
N6A1096E
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