Fiat Kobelco EX355 Tier2, Technical Manual

Page: 268 / 968

EX355 T5-3-3
TROUBLESHOOTING A
FAULT CODE 01 (ABNORMAL EC SENSOR OUTPUT SIGNAL)
•
Test harness: 75301706D
•
Specification:
Refer to page T5-3-8
Disconnect EC sensor
connector. Measure
resistance between EC
sensor side connector
terminals No.1 and No.3.
Check if it is 1.7
±
0.4 k
Ω
.
Connect test harness
between EC sensor and
vehicle harness.
Check if voltage
changes as specified
while turning the en-
gine control dial.
NO
NO
NO
NO
YES
YES
YES
YES
•
Key switch: ON
•
Key switch: ON
•
Specification: 5
±
0.5 V
•
After replacement,
refer to page T5-4-60.
•
After replacement,
refer to page T5-4-60.
Connector (harness end connector terminals seen from the open end side)
Main Controller (22P): “D” is added for each terminal number in the text.
EC Sensor
1 2 3
1 2 2 3 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
Disconnect EC
sensor connector.
Check if voltage
between harness end
connector terminals
No.1 and No.3 is
5±0.5 V.
Check if harness
between MC 22P
connector terminal
No.D15 and EC
sensor terminal No.2
is broken or short-
circuited.
Check if voltage
between harness end
connector terminals
No.1 and vehicle
frame matches
specification.
Faulty MC
Broken harness
between MC and EC
sensor.
Broken harness
between
MC and EC
sensor terminal No.3.
Broken harness
between
MC and EC
sensor terminal
No.1.
Faulty EC sensor