Subaru IMPREZA GD 2007 Series Manual page 190

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK HARNESS BETWEEN ECM AND
VARIABLE VALVE LIFT DIAGNOSIS OIL
PRESSURE SWITCH.
1) Warm-up the engine.
2) Turn the ignition switch to OFF.
3) Disconnect the connectors from the ECM
and variable valve lift diagnosis oil pressure
switch.
4) Measure the resistance of harness between
ECM and variable valve lift diagnosis oil pres-
sure switch connector.
Connector & terminal
(B134) No. 32 — (E35) No. 1:
2 CHECK HARNESS BETWEEN ECM AND
VARIABLE VALVE LIFT DIAGNOSIS OIL
PRESSURE SWITCH.
Measure the resistance between the variable
valve lift diagnosis oil pressure switch connec-
tor and engine ground.
Connector & terminal
(E35) No. 1 — Engine ground:
3 CHECK HARNESS BETWEEN ECM AND
VARIABLE VALVE LIFT DIAGNOSIS OIL
PRESSURE SWITCH.
1) Turn the ignition switch to ON.
2) Measure the voltage between the variable
valve lift diagnosis oil pressure switch connec-
tor and engine ground.
Connector & terminal
(E35) No. 1 (+) — Engine ground (–):
4 CHECK DTC.
1) Perform the Clear Memory Mode.
2) After idling the engine, check the DTC.
NOTE:
For detailed procedures, refer to Clear Memory
Mode. <Ref. to EN(H4SO)(diag)-47, Clear
Memory Mode.>
5 CHECK DTC.
1) Perform the Clear Memory Mode.
2) After idling the engine, check the DTC.
NOTE:
For detailed procedures, refer to Clear Memory
Mode. <Ref. to EN(H4SO)(diag)-47, Clear
Memory Mode.>
Check
Is the resistance less than 1 Ω? Go to step 2.
Is the resistance 1 MΩ or
more?
Is the voltage 10 V or more?
Is DTC displayed?
Is DTC displayed?
EN(H4SO)(diag)-81
ENGINE (DIAGNOSTICS)
Yes No
Repair the open
circuit of harness
between ECM and
variable valve lift
diagnosis oil pres-
sure switch con-
nector.
Go to step 3.
Repair short cir-
cuit of the harness
to ground between
ECM and variable
valve lift diagnosis
oil pressure switch
connector.
Go to step 4.
Repair the short
circuit to power of
the harness
between the ECM
and variable valve
lift diagnosis oil
pressure switch
connector.
Replace the oil END.
switching solenoid
valve. <Ref. to
ME(H4SO)-88, Oil
Switching Solenoid
Valve.> Go to step
5.
Check for oil rout- END.
ing.