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