Komatsu PC210-8, Руководство по ремонту

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UEN00244-02 40 Troubleshooting
16
PC210, 230, 240-8
E-4 Preheater does not operate 1
Trouble (1) When starting switch is turned to HEAT position, preheating monitor does not light up or flash.
Related informa-
tion
• Preheater monitor lights up when starting switch is turned to HEAT and starts flashing about 30 seconds
after to notify completion of preheating (It stops flashing about 10 seconds after).
• If engine coolant temperature is below 20°C, automatic warm-up system operates and preheating monitor
lights up for up to 30 seconds.
• Condition of starting switch (preheating) signal can be checked with the monitoring function.
(Code: 04500 Monitor input 1)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective starting switch (Inter-
nal disconnection)
a
Prepare with starting switch OFF, then keep starting switch OFF and
turn it to HEAT and carry out troubleshooting in each case.
H15 (male) Starting switch Resistance
Between (1) – (3)
OFF Min. 1 M
z
HEAT Max. 1
z
2
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in connec-
tor)
a
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between CM01 (female)
(16) – J02 – H15 (female) (3) Resist-
ance
Max. 1
z
3 Defective machine monitor
a
Prepare with starting switch OFF, then keep starting switch OFF and
turn it to HEAT and carry out troubleshooting in each case.
CE02 Starting switch Voltage
Between (16) –
chassis ground
OFF Max. 1 V
HEAT 20 – 30 V
Trouble (2) When starting switch is turned to HEAT position, intake air heater mounting part does not become warm.
Related informa-
tion
• Check that engine can be turned with starting motor (If engine cannot be turned, carry out troubleshooting
for E-1 Engine does not start (Engine does not turn)).
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective heater relay (Internal
disconnection)
a
Prepare with starting switch OFF (with wiring harness connected),
then keep starting switch OFF and turn it to HEAT and carry out
troubleshooting in each case.
Heater relay Starting switch Continuity/Resistance
Between R15 –
chassis ground
OFF There is continuity
Between power
supply terminal – R16
HEAT Max. 1
z
2
Defective intake air heater
(Internal disconnection)
a
Prepare with starting switch OFF (with wiring harness connected),
then turn starting switch to HEAT and carry out troubleshooting in
each case.
E01 Starting switch Voltage
Between terminal –
chassis ground
HEAT 20 – 30 V
If voltage is normal but heater mounting part does not become warm,
intake air heater is defective.
3
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in connec-
tor)
a
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between H15 (female) (3) –
J02 – heater relay R15 Resist-
ance
Max. 1
z
Wiring harness between battery relay R03 –
heater relay contact terminal Resist-
ance
Max. 1
z
Wiring harness between heater relay R16 –
intake air heater E01 Resist-
ance
Max. 1
z