Preheater Does Not Operate - Komatsu PC210-8 Shop Manual

UEN00244-02
E-4 Preheater does not operate
Trouble (1) When starting switch is turned to HEAT position, preheating monitor does not light up or flash.
• 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).
Related informa-
• If engine coolant temperature is below 20°C, automatic warm-up system operates and preheating monitor
tion
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)
Defective starting switch (Inter-
1
nal disconnection)
Possible causes
Disconnection in wiring har-
and standard
ness (Disconnection in wiring
value in normal
2
or defective contact in connec-
state
tor)
3 Defective machine monitor
Trouble (2) When starting switch is turned to HEAT position, intake air heater mounting part does not become warm.
Related informa-
• Check that engine can be turned with starting motor (If engine cannot be turned, carry out troubleshooting
tion
for E-1 Engine does not start (Engine does not turn)).
Defective heater relay (Internal
1
disconnection)
Possible causes
and standard
Defective intake air heater
value in normal
2
(Internal disconnection)
state
Disconnection in wiring har-
ness (Disconnection in wiring
3
or defective contact in connec-
tor)
16
Cause
a Prepare with starting switch OFF, then keep starting switch OFF and
turn it to HEAT and carry out troubleshooting in each case.
Between (1) – (3)
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)
a Prepare with starting switch OFF, then keep starting switch OFF and
turn it to HEAT and carry out troubleshooting in each case.
Between (16) –
chassis ground
Cause
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.
Between R15 –
chassis ground
Between power
supply terminal – R16
a Prepare with starting switch OFF (with wiring harness connected),
then turn starting switch to HEAT and carry out troubleshooting in
each case.
Between terminal –
chassis ground
If voltage is normal but heater mounting part does not become warm,
intake air heater is defective.
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
Wiring harness between battery relay R03 –
heater relay contact terminal
Wiring harness between heater relay R16 –
intake air heater E01
Standard value in normal state/Remarks on troubleshooting
H15 (male) Starting switch
CE02 Starting switch
Standard value in normal state/Remarks on troubleshooting
Heater relay Starting switch
E01 Starting switch
40 Troubleshooting
Resistance
OFF Min. 1 Mz
Max. 1 z
HEAT
Resist-
ance
Voltage
OFF Max. 1 V
HEAT 20 – 30 V
Continuity/Resistance
OFF There is continuity
Max. 1 z
HEAT
Voltage
HEAT 20 – 30 V
Resist-
ance
Resist-
ance
Resist-
ance
PC210, 230, 240-8
1
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z