Failure Code [Ca272] Imv (Ima) Disconnection - Komatsu WA250-6 Shop Manual

SEN03842-00

Failure code [CA272] IMV (IMA) Disconnection

Action code Failure code
E03
Contents of
• There is disconnection in supply pump actuator drive circuit.
trouble
Action of
• Turns the centralized warning lamp and alarm buzzer ON.
controller
Problem that
• Engine speed runs, but in unstable condition.
appears on
• Common rail fuel pressure is above command value.
machine
Related
• Method of reproducing failure code: Turn the starting switch ON.
information
Defective supply pump actu-
1
ator
Disconnection in wiring har-
ness
2
(Disconnection or defective
contact in connector)
Hot short (Short circuit with
Possible causes 3
24V circuit) in wiring harness
and standard
value in normal
state
Short circuit in wiring har-
4 ness
(with another wiring harness)
Defective wiring harness
5
connector
6 Defective engine controller
34
40-320
Trouble
CA272
Causes
320 Troubleshooting by failure code (Display of code), Part 2
Failure code [CA272] IMV (IMA) Disconnection
IMV (IMA) Disconnection
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
CP3 PUMP REGULATOR (male)
Between (1) and (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between EC1 (female) (2) –
CP3 PUMP REGULATOR (female) (1)
Wiring harness between EC1 (female) (32) –
CP3 PUMP REGULATOR (female) (2)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between EC1 (female) (2) –
CP3 PUMP REGULATOR (female) (1) and
ground
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness among all pins between EC1
(female) (2) – EC1 (female) (With all connec-
tors of wiring harness disconnected)
Connecting parts among supply pump actuator, engine wiring har-
ness, and engine controller are suspected. Inspect them directly.
• Loose connector, broken lock, broken seal
• Corrosive, bent, broken, forced-in, or extended pin
• Humidity in connector, entry of dirt or dust, poor insulation
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
EC1 (female)
Between (2) and (32)
1
Resistance
Max. 5 z
Resis-
Max. 10 z
tance
Resis-
Max. 10 z
tance
Voltage Max. 3 V
Resis- Min.
tance 100 kz
Resistance
Max. 5 z
WA250, 250PZ-6