SHANDONG CARTER HEAVY INDUSTRY MACHINERY CO., LTD.
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Possible causes Standard value in regular condition and reference value of fault diagnosis
Between 105 and Unlocked 1MΩ
GND Locked Below 1Ω
6)
Start motor fault
(open circuit or short
circuit inside)
★Turn the start switch of engine to OFF as preparation and keep it at OFF
during
diagnosis. If all PS, GND, signals and engine start input are correct while engine
start output is abnormal, the engine starter relay fails.
Engine or start motor Engine start switch Voltage
PS; terminal B and
GND
Start
20~30V
Input of engine start,
terminal C and GND
20~30V
7) Alternator fault
★Turn the start switch of engine to OFF as preparation and keep it at OFF
during
diagnosis.
Voltage
Below 1V
8)
Disconnected wire
harness (disconnect
from connector or
poor contact)
★Turn the start switch of engine to OFF as preparation and keep it at OFF
during
diagnosis.
Resistance Below 1
9)
Poor GND of wire
harness (contact with
earth circuit)
★Turn the start switch of engine to OFF as preparation and keep it at OFF
during
diagnosis.
Resistance Above 1M
10)
Short circuit of wire
harness (contact with
24V circuit)
★Turn the start switch of engine to OFF as preparation and keep it at OFF
during diagnosis.
Voltage Below 1V
2.
Engine flames out during operation
Symptom Engine flames out during operation
Causes Standard value in regular condition and reference value of fault
diagnosis
1)
Disconnected wire
harness (disconnect from
connector or poor
contact)
★Turn the start switch of engine to OFF as preparation and keep it
at
OFF during diagnosis.
Between CN-12T ② and CN-132F ⑥
Resistance Below 1
2)
Poor GND of wire
harness (contact with
earth circuit)
★Turn the start switch of engine to OFF as preparation and keep it
at
OFF during diagnosis.
Between CN-12T ② and CN-132F ⑥
Resistance Above 1M
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