Subaru 2004 LEGACY Service Manual page 151

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK HARNESS BETWEEN ECM AND
VARIABLE VALVE LIFT DIAGNOSIS OIL
PRESSURE SWITCH CONNECTOR.
1) Idle the engine.
2) Turn the ignition switch to OFF.
3) Disconnect the connectors from ECM and
variable valve lift diagnosis oil pressure switch
connector.
4) Measure the resistance of harness
between variable valve lift diagnosis oil pres-
sure switch connector and engine ground.
Connector & terminal
(E71) No. 1 — Engine ground:
3 CHECK HARNESS BETWEEN ECM AND
VARIABLE VALVE LIFT DIAGNOSIS OIL
PRESSURE SWITCH CONNECTOR.
Measure the resistance in harness between
ECM and variable valve lift diagnosis oil pres-
sure switch connector.
Connector & terminal
(B135) No. 21 — (E71) No. 1:
4 CHECK DTC.
1) Erase the memory. <Ref. to
EN(H6DO)(diag)-40, Clear Memory Mode.>
2) Check the DTC after idle the engine.
5 CHECK DTC.
1) Erase the memory. <Ref. to
EN(H6DO)(diag)-40, Clear Memory Mode.>
2) Check the DTC after idle the engine.
Check
Is any other DTC displayed?
Is the resistance more than 1
MΩ?
Is the resistance less than 1
Ω?
Is DTC displayed?
Is DTC displayed?
EN(H6DO)(diag)-220
Yes
Inspect the DTC Go to step 2.
using "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to
EN(H6DO)(diag)-
66, List of Diag-
nostic Trouble
Code (DTC).>
Go to step 3. Repair the ground
short circuit in har-
ness between
ECM and variable
valve lift diagnosis
oil pressure switch
connector.
Replace the vari- Repair the open
able valve lift oil circuit in harness
pressure switch. between ECM and
<Ref. to variable valve lift
FU(H6DO)-28, diagnosis oil pres-
Variable Valve Lift sure switch con-
Diagnosis Oil nector.
Pressure Switch.>
Go to step 4.
Replace the oil Temporary poor
flow control sole- contact occurs.
noid valve. <Ref.
to ME(H6DO)-78,
Oil Flow Control
Solenoid Valve.>
Go to step 5.
Check for oil rout- Temporary poor
ing. contact occurs.
Contact the SUB-
ARU dealer.
No