Isuzu N-Series. Manual — part 637
ENGINE ELECTRICAL 6D-41
QOS III Flow Chart
N6A3722E
6D-42 ENGINE ELECTRICAL
QOS II Timing Chart
Inspection on QOSIII System Operation
Inspection on Quick Heating Operation
1. Disconnect thermo-sensor connection on the ther-
mostat housing.
2. Connect the circuit tester between glow plug and
engine earth.
3. Inspect the following items with starter switch set to
ON position (but do not start the engine).
1) The glow indicator shall light for 1 — 6 seconds.
2) The circuit tester shall indicate power supply
voltage for 9 — 13 seconds.
• If above specifications are not satisfied, inspect
wire harness, glow relay and thermo-sensor. If
satisfied, inspect glow plug.
N6A3723E
N6A3039E
N6A3725E
ENGINE ELECTRICAL 6D-43
Inspection on Quick Heating Afterglow Operation
1. Disconnect thermo-sensor connection on the ther-
mostat housing.
2. Connect the circuit tester between glow plug and
engine earth.
3. Inspect the following item with start the engine.
1) The circuit tester shall indicate power supply
voltage for about 5 seconds.
• If above specification is not satisfied, inspect
battery voltage, engine earth, wire harness and
starter switch “st” signal to control unit.
If satisfied, inspect wiring harness, engine
earth and starter switch.
Inspection on Afterglow Operation
1. Disconnect thermo-sensor connection on the ther-
mostat housing.
2. Connect the circuit tester between glow plug and
engine earth.
3. Inspect the following items with start the engine.
1) The circuit tester shall indicate about 7 volts af-
ter 360 seconds of engine start.
• If above specifications are not satisfied, inspect
battery voltage, engine earth, wiring harness,
glow plug, dropping resistor, relay No. 2 and
charge relay.
N6A3039E
N6A3725E
N6A3039E
N6A3725E
6D-44 ENGINE ELECTRICAL
Thermo Sensor
Measure the resistance depending on the water temper-
ature as shown in the left figure. (Measuring range: 10
°C
— 50
°C)
When installing the thermo sensor, apply sealant (Loc-
tite #262 or equivalent) (1) to narrowed portion in figure
to prevent water leakage.
Tighten:
Thermo sensor to 8 N
⋅m (0.8 kg⋅m/69 lb⋅in)
Glow Plug
Inspect the resistance
Tighten:
Glow plug to 23 N
⋅m (2.3 kg⋅m/17 lb⋅ft)
Dropping Resistor
Inspect the resistance
Glow Plug Relay
Inspect the continuity
If apply the battery voltage to terminal between 4 — 5
Temperature
Current (mA)
Resistance (KW)
20
± 1
1.0
2.0 — 3.0
50
± 1
1.0
0.68 — 1.0
Resistance at normal temperature
Ω
0.8 — 1.0
N6A3730E
N6A3731E
Resistance of normal ambient temperature
m
Ω
225 — 255
2 — 3
No Continuity
2 — 3
Continuity
N6A3732E
N6A3733E
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