Isuzu NHR 4J Series, Workshop Manual

Page: 379 / 406

6D7 – 6 QOSIII PREHEATING SYSTEM
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 after 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.
THERMO SENSOR
Measure the resistance depending on the water
temperature as shown in the left figure. (Measuring range:
10°C ~ 50°C)
Temperature Current (mA) Resistance (KW)
20 ± 1 1.0 2.0 ~ 3.0
50 ± 1 1.0 0.68 ~ 1.0
When installing the thermo sensor, apply sealant (Loctite
#262 or equivalent) to narrowed portion in the left figure to
prevent water leakage
Torque
N ∙ m (kg ∙ m/lb ∙ in)
8 (0.8/69)
GLOW PLUG
Inspect the resistance
Resistance at normal temperature
Ω
0.8 ~ 1.0
Torque N ∙ m (kg ∙ m/lb ∙ ft)
23 (2.3/17)
6D7-6-1.tif
6D7-6-2.tif
6D7-6-3.tif
6D7-6-4.tif