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Chery QQ Service Manual Page 48

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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
48
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 22-30Ω 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 cable6
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 cable3
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 22-30Ωwhen 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
6
Check if there is short circuit to power supply between
the circuit of canister joint pin No.2 and ECU pin No. 46.
Yes
Repair or replace
cable
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