Chery A21 2005 Service Manual page 368

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