Engine Electrical System

Diagnostic trouble code: P0481 “Malfunction in control circuit of relay of A/C
condenser fan B”
Item
No.
Operation procedure
Inspection
results
Follow-up
procedure
1
Connect the diagnostic tester and adaptor,
and turn the ignition switch to “OFF”
position.
Proceed to next
step.
Yes Proceed to Step 4
2
Pull out the relay of A/C condenser fan,
turn the ignition switch to “ON” position
and verify that the voltage between the
power supply terminal of the relay (i.e.
30# and 85# pins of the relay) 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 the
relay of A/C condenser fan is open or short
to ground.
No Proceed to Step 2
Yes Replace the relay.
4
Inspect with multimeter to verify that the
voltage between the control terminal of
relay of A/C condenser fan (i.e. 86# pin of
the relay) and the negative grid of power
supply is about 3.7V.
No
Proceed to next
step.
Yes
Repair or replace
the wiring harness.
5
Verify that the circuit between the control
terminal of relay (i.e. 86# pin of the relay)
and 68# pin of ECU is open or is short to
power supply or to ground.
No
Refer to diagnosis
help.
E-47
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