Failure Code [Ca271] Imv (Ima) Short Circuit - Komatsu WA250-6 Shop Manual

320 Troubleshooting by failure code (Display of code), Part 2

Failure code [CA271] IMV (IMA) Short circuit

Failure code [CA271] IMV (IMA) Short circuit
Action code Failure code
E03
Contents of
• There is short circuit in supply pump actuator drive circuit.
trouble
Action of
• Turns the centralized warning lamp and alarm buzzer ON.
controller
• Engine speed does not rise from low idle.
Problem that
appears on
• Engine output drops.
machine
• Common rail fuel pressure is above command value.
Related
• Method of reproducing failure code: Turn the starting switch ON.
information
Defective supply pump actu-
1
ator
Ground fault in wiring har-
ness
2
(Short circuit with ground cir-
cuit)
Possible causes
and standard
Short circuit in wiring har-
value in normal
3 ness
state
(with another wiring harness)
Defective wiring harness
4
connector
5 Defective engine controller
Related circuit diagram
WA250, 250PZ-6
Trouble
CA271
Causes
IMV (IMA) Short circuit
(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 ground
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) 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 ground
SEN03842-00
1
Resistance
Min. 100 kz
Resis- Min.
tance 100 kz
Resis- Min.
tance 100 kz
Resistance
Min. 100 kz
33
40-320