CF MOTO CF500-5B 2009, Service Manual, Page: 259 / 272

13 Troubleshooting
13 - 11
13
Errors coding: P0458 Control circuit voltage of idle air control valve too
low
Maintenance Tips
"
The possible faults may exists as follow:
1
!
Circuit ECU connected is short circuit
Maintenance Tips
"
Check the item as follow:
1
!
Measure connected to the ECU
pin-to-ground resistance whether proper
or not
Errors coding: P0459 Control circuit voltage of idle air control valve too
high
Maintenance Tips
"
The possible faults may exists as follow:
1
!
Short circuit between ECU circuit
connected and No.1 pin of idle air control
valve.
2
!
Short circuit between circuit ECU pin
connected and other electrical source
circuits
Maintenance Tips
"
Check the item as follow:
1
!
Measure the voltage of ECU pin whether
normal or not
2
!
Measure resistance between ECU pin
and No.1 pin of idle air control valve
Errors coding: P0501Speed sensor signal improper.
Explanation: W hen loose throttle and keep direct to free-wheel, ECU measure engine
rotate speed and vehicle speed together. If engine lasting higher speed but vehicle
speed display “ 0 ” or too low obviously, system will judge that vehicle speed signal faults.
Maintenance Tips
"
The possible faults may exists as follow:
1
!
The signal circuit ECU connected and
vehicle speed sensor short to ground or
open to ground.
Maintenance Tips
"
Check the item as follow:
1) Check circuit resistance that connecter
of ECU joint to vehicle speed signal sensor.
2
!
Check resistance to ground of ECU pin.
Errors coding:
P0506 Rotate speed of idle air control valve slower than target
idle speed
Explanation: Engine rotate speed of idle speed control valve works by closed-loop control.
And it indicates fault if ECU performs idle speed controlling after a certain time, but the
actual engine speed still slower than target idle speed.
Maintenance Tips
"
The possible faults may exists as follow:
1
!
Idle air control valve not work.
2
!
Check adjust bolt of throttle valve
#
throttle cable
#
throttle operating
condition etc. whether are in condition
or not.
3
!
Too dirty inside of throttle valve body