SEN00460-01 40 Troubleshooting
18 114E-3 Series
E-36 Code [441/CA441] Supply Voltage Low Error 1
Error code Failure code
Trouble Abnormally low power supply voltage
441 CA441
Contents of trou-
ble
• Low voltage occurred in controller power supply circuit.
Action of
controller
• None in particular.
Problem that
appears
on machine
• Engine stops
• Starting performance is poor
Related informa-
tion
• 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
Loose, corroded battery ter-
minal
Inspect battery terminal directly for loose and corrosion.
2 Defective battery voltage
a Prepare with starting switch OFF, then turn starting switch OFF
and START and carry out troubleshooting.
Battery (1 piece) Starting switch Voltage
Between (+) – (–)
terminals
OFF Min. 12 V
START Min. 6.2 V
3 Defective fuse No. 19 If fuse is burnt out, circuit probably has ground fault. (See cause 6.)
4
Defective relay for engine
controller power supply
a Prepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
Replace relays for engine controller power supply (R23, R24) with
other relays. If mark E of failure code disappears after reproduction
operation is conducted, that relay has a defect.
5
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in con-
nector)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between F01-19 – R23, R24
(female) (3)
Resis-
tance
Max. 10 z
Wiring harness between R23, R24 (female)
(5) – J3 (female) (3)
Resis-
tance
Max. 10 z
Wiring harness between J3 (female) (1) –
chassis ground (T12)
Resis-
tance
Max. 10 z
6
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 F01-19 – R23, R24
(female) (3) and chassis ground
Resis-
tance
Min.
100 kz
Wiring harness between R23, R24 (female)
(5) – J3 (female) (3) and chassis ground
Resis-
tance
Max. 10 z
7
Short circuit in wiring harness
(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 J3
(female) (3) – J3 (female) (1) (With battery
terminal disconnected)
Resis-
tance
Min.
100 kz
Wiring harness among all pins between J3
(female) (3) – J2 (female) (With battery termi-
nal disconnected)
Resis-
tance
Min.
100 kz
Wiring harness among all pins between J3
(female) (1) – J2 (female) (With battery termi-
nal disconnected)
Resis-
tance
Min.
100 kz
8
Defective wiring harness con-
nector
Connecting parts among fuse No. 19, engine unit wiring harness,
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
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