HYOSUNG GV250 EI Service Manual page 39

4-1-23 EI SYSTEM DIAGNOSIS
MALFUNCTION
DETECTED ITEM
CODE
Ignition coil (IG coil),
C24 / C25
NO.1 / NO.2
Idle speed control
C27
solenoid (ISC solenoid)
Gear position switch
C31
(GP switch)
C32 / C33 Fuel injector, NO.1 / NO.2
Secondary air valve
C37
solenoid (SAV solenoid)
Fuel pump relay
C41
Oxygen sensor heater
C43
(O
Ignition signal is interrupted continuous by 31 times or more
when ECU confirm ignition surge at each combustion chamber.
In this case, the code C24 or C25 is indicated.
Ignition coil, wiring / coupler connection, power supply from the
battery.
The idle speed control solenoid step should be the following.
O step
Without the above range, C27 is indicated.
Idle speed control solenoid, lead wire / coupler connection.
It judges from gear position voltage, engine speed and throttle
position by ECU, when 0.15 V
V for more 2 sec.. If gear position voltage get out of the above
voltage, C31 is indicated.
Gear position switch, wiring / coupler connection, gearshift cam
etc.
Injector signal is interrupted continuous for more than 1 sec.
when ECU confirm injector running surge at each combustion
chamber, C32 or C33 is indicated.
Injector, wiring / coupler connection, power supply to the
injector.
No voltage is applied from ECU to secondary air valve solenoid
by 400 sec.. In this case, the code 37 is indicated.
Secondary air valve solenoid, lead wire / coupler connection.
Voltage is applied continuous for more than 5 sec., battery
voltage
battery voltage
In this case, the code 41 is indicated.
Fuel pump relay, connecting lead wire, power source to fuel
pump relay, fuel injector.
The oxygen sensor heater signal is not inputted in ECU.
S heater)
2
Oxygen sensor heater, lead wire / coupler connection.
DETECTED FAILURE CONDITION
CHECK FOR
solenoid step 250 step
<
3.2 V when fuel pump relay is "OFF" position or
<
1.5 V when fuel pump relay is "ON" position.
38
<
Gear position voltage 3.93