Code [272/Ca272] Imv (Ima) Open Error - Komatsu 114E-3 Series Shop Manual

SEN00459-01
E-19 Code [272/CA272] IMV (IMA) Open Error
Error code Failure code
272
Contents of
• There is disconnection in supply pump actuator drive circuit.
trouble
Action of
• None in particular.
controller
Problem that
• Engine speed runs, but in unstable condition.
appears
• Common rail fuel pressure is above command value.
on machine
Related infor-
• Method of reproducing failure code: Starting switch ON.
mation
Defective supply pump actu-
1
ator
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Hot short (Short circuit with
3
Possible
24V circuit) in wiring harness
causes 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
32
Trouble
CA272
Causes
Disconnection 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) – (2)
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)
Wiring harness between J1 (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 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) – (32)
40 Troubleshooting
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
114E-3 Series