Subaru Forester 2004 Service Manual page 131

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTIC)
Step
1 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 32 (+) — Chassis ground (
2 CHECK POOR CONTACT.
Check poor contact in ECM connector.
3 CHECK HARNESS BETWEEN WASTEGATE
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from wastegate
control solenoid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 32 (+) — Chassis ground (
4 CHECK WASTEGATE CONTROL SOLE-
NOID VALVE.
1) Turn the ignition switch to OFF.
2) Measure the resistance between wastegate
control solenoid valve terminals.
Terminals
No. 1 — No. 2:
5 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Check
Is the voltage more than 10 V? Go to step 3.
−
):
Is there poor contact in ECM
connector?
Is the voltage more than 10 V? Repair battery
−
):
Is the resistance less than 1
Ω?
Is there poor contact in ECM
connector?
EN(H4DOTC 2.5)-130
Yes
Go to step 2.
Repair the poor Replace the ECM.
contact in ECM <Ref. to
connector. FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>
Go to step 4.
short circuit in har-
ness between
ECM and waste-
gate control sole-
noid valve
connector. After
repair, replace the
ECM. <Ref. to
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>
Replace the waste- Go to step 5.
gate control sole-
noid valve and
ECM. <Ref. to
FU(H4DOTC 2.5)-
35, Wastegate
Control Solenoid
Valve.> <Ref. to
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>
Repair the poor Replace the ECM.
contact in ECM <Ref. to
connector. FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>
No