SEN04123-01 40 Troubleshooting
14 PC130-8
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
information
• Preheater monitor lights up when starting switch is turned to HEAT and starts flashing about 30 sec-
onds 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
(Internal 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 (female) Starting switch Resistance
Between (1) – (3)
OFF Min. 1 Mz
HEAT Max. 1 z
2
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in con-
nector)
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)
Resis-
tance
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.
CM01 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
information
• Check that engine can be turned with starting motor (If engine cannot be turned, carry out trouble-
shooting 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 (Inter-
nal disconnection)
a Prepare with starting switch OFF (with wiring harness con-
nected), then keep starting switch OFF and turn it to HEAT and
carry out troubleshooting in each case.
Heater relay Starting switch
Continuity/Resis-
tance
Between R17 –
chassis ground
OFF There is continuity
Between R15 – R16 HEAT Max. 1 z
2
Defective intake air heater
(Internal disconnection)
a Prepare with starting switch OFF (with wiring harness con-
nected), then turn starting switch to HEAT and carry out trou-
bleshooting in each case.
M23 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 con-
nector)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between H15 (female) (3) –
J02 – heater relay R17
Resis-
tance
Max. 1 z
Wiring harness between battery relay R03A
– heater relay contact terminal (R15)
Resis-
tance
Max. 1 z
Wiring harness between heater relay R16 –
intake air heater M23
Resis-
tance
Max. 1 z
To Next Page
Loading...
Need help?
General
