CyClone RT2E Modern 250 User Manual page 26

EFI failure
Common Failures Classification
Electrical
applianc
Oil pump not working
EFI
Intake and
exhaust
EFI
The vehicle cannot be started
engine
Electrical
applianc
Intake and
exhaust
Idle speed is too high or too slow
stable
EFI
Possible causes
The battery power supply is not connected properly
eTshe fuse is in poor contact or has blown
Oil pump relay is broken
Oil pump failure
ECU failure or no program
Leakage in the intake system causes the air-fuel ratio to be too lean and unable
to ignite
Ignition coil failure
Fuel injector failure or blockage
Insufficient oil pump pressure
Throttle position sensor failure
Oxygen sensor damaged
Temperature sensor damaged
Trigger coil failure
Spark plug ignition failure
The spark plug cap and the spark plug are in poor contact
Cylinder pull or valve seal is not tight
The battery power supply is not connected properly or is low on power.
eTshe fuse is in poor contact or has blown
Oil pump relay is broken
Leakage in the intake system causes the air-fuel ratio to be lean and the speed
to be unstable
The throttle cable is too tight and does not return to zero, and the valve body
leakage is too large
Carbon deposits seriously block the valve body bypass channel
Stepper motor lost steps
Stepper motor is broken
Throttle position sensor failure
Insufficient oil pump pressure
Troubleshooting methods
Check and tighten the battery
Check and replace the fuse
Check and replace the oil pump relay
Replace the oil pump
Replace ECU
Check the injector installation position, the intake pipe and engine mounting surface, the throttle body
assembly and intake pipe installation connection, and whether the intake pipe desorption pipe is leaking.
Replace the ignition coil
Check and replace the injector
Check or replace the oil pump
Check or replace throttle position sensor
Check or replace oxygen sensor
Check or replace the intake air temperature sensor or cylinder head temperature sensor
Check the trigger coil and wiring harness
Check connector or replace spark plug or spark plug cap
Check and replace engine
Check and tighten the battery
Check and replace the fuse
Check and replace the oil pump relay
Check the injector installation position, the intake pipe and engine installation surface, and the throttle
body assembly and intake pipe installation connection for leaks.
Check and adjust the tightness of the throttle cable or replace the valve body
Cleaning carbon deposits
Re-initialize the stepper motor to reset it, thus eliminating the stepper motor step loss problem
Replace the stepper motor
Check or replace throttle position sensor
Check or replace the oil pump
User Manual
. 25 .