HYOSUNG AQUILA 250 FI, Service Manual, Page: 67 / 90

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7-1-1 SERVICING INFORMATION
TROUBLESHOOTING
◉ ◉
MALFUNCTION CODE AND DEFECTIVE CONDITION
C15
C17 / C18
C21
C22
Engine temperature
sensor (ETS)
Intake air pressure
sensor (IAPS),
NO.1 / NO.2
Intake air temperature
sensor (IATS)
Oxygen sensor (O
2
S)
Intake air temperature sensor, lead wire / coupler connection.
Intake air pressure sensor, lead wire / coupler connection.
Engine temperature sensor, lead wire / coupler connection.
Oxygen sensor, lead wire / coupler connection.
DETECTED ITEM
DETECTED FAILURE CONDITION
CHECK FOR
MALFUNCTION
CODE
The sensor voltage should be the following.
0.1 V
� sensor voltage < 4.6 V
Without the above range for 4 sec. and more, C15 is indicated.
The oxygen sensor signal is input in ECU since then more than
120 sec. after the engine run.
When this is the case, ECU not receive the signal, C22 is
indicated.
The sensor voltage should be the following.
0.1 V
�
sensor voltage < 4.6 V
Without the above range for 4 sec. and more, C21 is indicated.
The sensor should produce following voltage.
0.1 V
� sensor voltage � 4.8 V
Without the above range for 4 sec. and more, C17 or C18 is
indicated.