Failure Code [Ca2556] Grid Htr Relay Volt High Error - Komatsu Galeo PC800-8 Shop Manual

SEN00791-02

Failure code [CA2556] Grid Htr Relay Volt High Error

Action code Failure code
E15 CA2556
Contents of
• Open error was detected in intake air heater relay circuit
trouble
Action of
• Stops driving auto-preheater relay R18.
controller
Problem that
• Auto-preheater does not work (Manual preheater works).
appears on
• Engine does not start easily at low temperature.
machine
Related
information
Defective grid heater relay
1
(Internal defect)
Disconnection in wiring har-
ness
2 (Disconnection in wiring or
defective contact in con-
nector)
Possible causes
and standard
value in normal
state
Ground fault in wiring har-
ness
3
(Short circuit with GND cir-
cuit)
4 Defective engine controller
50
Grid Htr Relay Volt High Error
Trouble
(Engine controller system)
Cause
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between CE02 (female) (40) –
R18 (female) (1)
Wiring harness between CE02 (female) (42) –
R18 (female) (2)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between CE02 (female) (40) –
R18 (female) (1) and chassis ground
Wiring harness between CE02 (female) (42) –
R18 (female) (2) and chassis ground
aPrepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
Between (40) – (42)
Standard value in normal state/Remarks on troubleshooting
R18 (male)
Between (1) – (2)
CE02 Heater relay
Operating condition
Stop condition
40 Troubleshooting
Resistance
200 – 400 z
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Voltage
Max. 1 V
20 – 30 V
PC800, 850-8