Failure Code [Ca2556] Grid Htr Relay Volt Low Error - Komatsu PC210-8 Shop Manual

UEN00241-01

Failure code [CA2556] Grid Htr Relay Volt Low Error

User code Failure code
E15 CA2556
Contents of
• Short circuit was detected in drive circuit of intake air heater relay.
trouble
Action of
• None in particular.
controller
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 discon-
nection)
Ground fault in wiring har-
2 ness (Short circuit with GND
Possible causes
circuit)
and standard
value in normal
state
Short circuit in wiring har-
3 ness (with another wiring
harness)
Defective wiring harness
4
connector
5 Defective engine controller
46
Grid heater relay volt low error
Trouble
(Engine controller system)
Cause
a Prepare with starting switch OFF, then carry out troubleshooting
a Prepare with starting switch OFF, then turn starting switch ON
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 Prepare with starting switch OFF, then carry out troubleshooting
Wiring harness between CE02 (female) (40)
– R18 (female) (1)
a Prepare with starting switch OFF, then carry out troubleshooting
Wiring harness between CE02 (female) (40)
– each of CE02 (female) pins (With R18 dis-
connected)
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 troubleshooting
Standard value in normal state/Remarks on troubleshooting
without turning starting switch ON. (Troubleshooting for relay
unit)
R18 (male)
Between (1) – (2)
and carry out troubleshooting. (Troubleshooting by replacement)
without turning starting switch ON.
without turning starting switch ON.
without turning starting switch ON.
CE02 (female)
Between (40) – (42)
40 Troubleshooting
1
Resistance
300 – 600 z
Resis- Min. 100
tance kz
Resis- Min. 100
tance kz
Resistance
300 – 600 z
PC210, 230, 240-8