SANY LATIN AMERICA
7-67
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
E-2 Engine runs rough or is unstable
Trouble
Engine Runs Rough or Is Unstable
Related information
Engine speed can be read on the monitor.
Possible causes and standard value in normal state
Cause
Standard value in normal state/Remarks on troubleshooting
1
Open circuit of
wire harness
●
Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Unplug the connector controller, and measure
the resistance between pin 19 and pin 38.
Resistance
2.3±0.2 K
Ω
2
Internal failure
in sensor
●
Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between CN-448M A and B
Resistance
2.3±0.2 K
Ω
3
Short circuit of
wire harness
(grounded)
●
Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between CN-448M B and ground
Resistance
≥
1M
Ω
4
Internal failure
of controller
No troubleshooting can be done due to internal failure. (Failure lies in the con-
troller if the reasons above are ruled out)
5
38
19
B
A
(
S-2
)
CN-448M
ZX215-1005096
INPUT SIGNAL
GND
SPEED SENSOR
SPEED SENSOR
GND
CONTROLLER
SIGNAL
CAB
CHASSIS HARNESS
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