Engine Electrical System

Diagnostic trouble code: P0445 “Overvoltage 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 and 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 short
to power supply.
No
Refer to diagnosis
help.
E-45
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