Chery A21 2005, Service Manual, Page: 368 / 475

CHERY
·
A21 SERVICE MANUAL ENGINE EFI SYSTEM
45
DTC: P0444 Much lower voltage of canister control valve drive grade control circuit
No. Operating steps Result Follow up steps
1
Connect the diagnostic tester and commutator, put the
ignition switch to
“
ON
”
Next step
Yes To step No.4
2
Take off the canister control valve joint from the cable;
check the voltage value by multimeter between this
joint pin No.1 and power supply cathode; and observe
if it is around 12V.
No Next step
Yes
Repair or
replace the
cable
3
Check if there is open circuit or short circuit to ground
of the canister control valve power supply ends circuit.
No To step No.2
Yes Next step
4
Check the resistance value if it is around 22-30
Ω
when
it is 20
℃
between canister control valve pin No.1 and
pin No.2.
No
Replace the
valve
Yes Diagnosis help
5
Check the voltage by the multimeter if it is around
3.7V between canister control valve joint pin No.1 and
power supply cathode.
No Next step
Yes
Repair or
replace cable 6
Check if there is short circuit to ground between the
circuit of canister joint pin No.2 and ECU pin No. 46.
No Diagnosis help
DTC: P0445 Much higher voltage of canister control valve drives grade control circuit
No. Operating steps Result Follow up steps
1
Connect the diagnostic tester and commutator, put the
ignition switch to
“
ON
”
Next step
Yes To step No.4
2
Take off the canister control valve joint from the cable;
check the voltage value by multimeter between this joint
pin No.1 and power supply cathode; and observe if it is
around 12V.
No Next step
Yes
Repair or replace
the cable 3
Check if there is open circuit or short circuit to ground of
the canister control valve power supply ends circuit.
No To step No.2
Yes Next step
4
Check the resistance value if it is around 22-30
Ω
when it
is 20
℃
between canister control valve pin No.1 and pin
No.2.
No
Replace the
valve
Yes Diagnosis help
5
Check the voltage by the multimeter if it is around 3.7V
between canister control valve joint pin No.1 and power
supply cathode.
No Next step
Yes
Repair or replace
cable 6
Check if there is short circuit to power supply between
the circuit of canister joint pin No.2 and ECU pin No. 46.
No Diagnosis help
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