Engine Electrical System

Diagnostic trouble code: P0443 “Malfunction in control circuit of drive stage of
carbon canister control valve”
Item
No.
Operation procedure
Inspection
results
Follow-up
procedure
1
Connect the diagnostic tester and adaptor, and
turn the ignition switch to “ON” position.
Proceed to next
step.
Yes
Proceed to Step
4
2
Disconnect the connector of carbon canister
control valve on the wiring harness, inspect
with multimeter to verify that the voltage
between 1# pin of this connector and the
negative grid of power supply is about 12V.
No
Proceed to next
step.
Yes
Repair or
replace the
wiring harness. 3
Verify that the power supply circuit of carbon
canister control valve is open or short to
ground.
No
Proceed to Step
2
Yes
Proceed to next
step.
4
Inspect with multimeter to verify that the
resistance between 1# and 2# pins of carbon
canister control valve is within 22-30Ω under
20.℃
No
Replace the
control valve.
Yes
Refer to
diagnosis help.
5
Inspect with multimeter to verify that the
voltage between 1# pin of carbon canister
control valve connector and the negative grid
of power supply is about 3.7V.
No
Proceed to next
step.
Yes
Repair or
replace the
wiring harness. 6
Verify that the circuit between 2# pin of
carbon canister control valve connector and
46# pin of ECU is open.
No
Refer to
diagnosis help.
E-43
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