Engine Electrical System

Diagnostic trouble code: P0230 “Malfunction in control circuit of fuel pump”
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 Step4
2
Pull out the relay of fuel pump, turn the
ignition switch to “ON” position, and
verify that the voltage between the power
supply terminal of fuel pump relay (i.e.
30# and 86# pin 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 is open or short to ground.
No Proceed to Step2
Yes
Replace the fuel
pump relay.
4
Inspect with multimeter to verify that the
voltage between the control terminal of
fuel pump relay (i.e. 85# 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 the relay (i.e. 85# pin of the
relay) and 69# pin of ECU is open or short
to power supply or ground.
No
Refer to diagnosis
help.
E-38
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