Subaru Legacy 2002 Service Manual page 618

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B134) No. 24 (+) — Chassis ground
(−):
2 CHECK POWER SUPPLY TO AIR ASSIST
INJECTOR SOLENOID VALVE.
1) Turn ignition switch to OFF.
2) Disconnect connector from air assist injec-
tor solenoid valve.
3) Turn ignition switch to ON.
4) Measure voltage between air assist injector
solenoid valve and engine ground.
Connector & terminal
(E42) No. 2 (+) — Engine ground (−):
3 CHECK HARNESS BETWEEN ECM AND
AIR ASSIST INJECTOR SOLENOID VALVE
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
ECM and air assist injector solenoid valve
connector.
Connector & terminal
(B134) No. 24 — (E42) No. 1:
4 CHECK HARNESS BETWEEN ECM AND
AIR ASSIST INJECTOR SOLENOID VALVE
CONNECTOR.
Measure resistance of harness between ECM
and chassis ground.
Connector & terminal
(B134) No. 24 — Chassis ground:
5 CHECK POOR CONTACT.
Check poor contact in ECM and air assist
injector solenoid valve connectors.
Step
Is the voltage more than 10
V?
Is the voltage more than 10
V?
Is the resistance less than
1 Ω?
Is the resistance less than
10 Ω?
Is there poor contact in
ECM and air assist injector
solenoid valve connectors?
EN-101
Check Yes
Repair poor con-
tact in ECM con-
nector.
Go to step 3.
Go to step 4.
Repair ground
short circuit in
harness between
ECM and air
assist injector
solenoid valve
connector.
Repair poor con-
tact in ECM and
air assist injector
solenoid valve
connectors.
Engine (Diagnostics)
No
Go to step 2.
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
air assist injector
solenoid valve
and main relay
connector
¼ Poor contact in
coupling connec-
tor (B22)
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
ECM and air
assist injector
solenoid valve
connector
¼ Poor contact in
coupling connec-
tor (B22)
Go to step 5.
Replace air assist
injector solenoid
valve. <Ref. to
FU-40, Air Assist
Injector Solenoid
Valve.>