WCM CTX8010C - Page 50

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Possible causes
Standard value in regular condition and reference value of fault diagnosis
Between 105 and
GND
Unlocked
1MΩ
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