Failure Code [Ca2555] Grid Htr Relay Volt Low Error - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02630-05

Failure code [CA2555] Grid Htr Relay Volt Low Error

Action code Failure code
E15 CA2555
Contents of
• Disconnection was detected in drive circuit of intake air heater relay.
trouble
Action of con-
• None in particular.
troller
Problem that
• Intake air heater does not work (Engine does not start easily and exhaust gas becomes white at low
appears on
temperature).
machine
Related infor- • Method of reproducing failure code: Turn starting switch ON when engine coolant temperature is
mation below –4°C.
Defective automatic pre-
1 heater relay
(Internal disconnection).
Disconnection in wiring har-
ness
Possible causes
2 (Disconnection in wiring or
and standard
defective contact in connec-
value in normal
tor)
state
Ground fault in wiring har-
ness
3
(Short circuit with GND cir-
cuit)
Defective wiring harness
4
connector
5 Defective engine controller
52
Grid heater relay volt low error
Trouble
(Engine controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a
a
Replace automatic preheater relay (R18) with another relay and
perform reproducing operation. If "E" of failure code goes off at this
time, replaced relay is defective.
a
Wiring harness between CE02 (female) (40)
– R18 (female) (1)
Wiring harness between CE02 (female) (42)
– R18 (female) (2)
a
Wiring harness between CE02 (female) (40)
– R18 (female) (1) and chassis ground
Connecting parts between automatic preheater relay – machine wir-
ing harness – engine controller may be defective. Check them
directly.
• Looseness of connector, breakage of lock, or breakage of seal
• Corrosion, bend, breakage, push-in, or expansion of pin
• Moisture or dirt in connector or defective insulation
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON. (Troubleshooting for
relay unit)
R18 (male)
Between (1) – (2)
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting. (Troubleshooting by replace-
ment)
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
CE02 (female)
Between (40) – (42)
40 Troubleshooting
1
Resistance
300 – 600 z
Resis-
Max. 10 z
tance
Resis-
Max. 10 z
tance
Resis- Min.
tance 100 kz
Resistance
300 – 600 z
PC300, 350-8