Subaru Legacy 2003 Service Manual page 615

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
1 CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
Step
EN(H4SO)-218
Value
DTC indicated.
Yes
Inspect the rele- Check radiator fan
vant DTC using and fan motor.
"List of Diagnostic <Ref. to
Trouble Code CO(H4SO)-28,
(DTC)". <Ref. to Radiator Main Fan
EN(H4SO)-83, List and Fan Motor.>
of Diagnostic and <Ref. to
Trouble Code CO(H4SO)-30,
(DTC).> Radiator Sub Fan
and Fan Motor.>
No