Code [271/Ca271] Imv (Ima) Short Error - Komatsu 114E-3 Series Shop Manual

40 Troubleshooting
E-18 Code [271/CA271] IMV (IMA) Short Error
Error code Failure code
271
Contents of
• There is short circuit in supply pump actuator drive circuit.
trouble
Action of
• None in particular.
controller
Problem that • Engine speed does not rise from low idle.
appears • Engine output drops.
on machine • Common rail fuel pressure is above command value.
Related infor-
• Method of reproducing failure code: Starting switch ON.
mation
Defective supply pump actu-
1
ator
Ground fault in wiring har-
2 ness (Short circuit with GND
circuit)
Possible
Short circuit in wiring har-
causes and
3 ness (with another wiring
standard value
harness)
in normal state
Defective wiring harness
4
connector
5 Defective engine controller
Circuit diagram related to supply pump actuator (metering unit)
114E-3 Series
Trouble
CA271
Causes
Short circuit in IMV (IMA)
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) – chassis ground
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between J1 (female) (2) –
CP3 PUMP REGULATOR (female) (1)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness among all pins between J1
(female) (2) – J1 (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.
J1 (Female)
Between (2) – chassis ground
SEN00459-01
1
Resistance
Min. 100 kz
Resis- Min.
tance 100 kz
Resis- Min.
tance 100 kz
Resistance
Min. 100 kz
31