Subaru Legacy 2005 Service Manual page 1877

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM con-
nector and chassis ground on faulty cylinders.
Connector & terminal
#1 (B136) No. 6 (+) — Chassis ground (
#2 (B136) No. 5 (+) — Chassis ground (
#3 (B136) No. 4 (+) — Chassis ground (
#4 (B136) No. 3 (+) — Chassis ground (
#5 (B136) No. 2 (+) — Chassis ground (
#6 (B136) No. 1 (+) — Chassis ground (
3 CHECK HARNESS BETWEEN FUEL INJEC-
TOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector
on faulty cylinders.
3) Measure the resistance between ECM con-
nector and engine ground on faulty cylinders.
Connector & terminal
#1 (E5) No. 1 — Engine ground:
#2 (E16) No. 1 — Engine ground:
#3 (E6) No. 1 — Engine ground:
#4 (E17) No. 1 — Engine ground:
#5 (E43) No. 1 — Engine ground:
#6 (E44) No. 1 — Engine ground:
4 CHECK HARNESS BETWEEN FUEL INJEC-
TOR AND ECM CONNECTOR.
Measure the resistance of harness connector
between ECM connector and fuel injector on
faulty cylinders.
Connector & terminal
#1 (B136) No. 6 — (E5) No. 1:
#2 (B136) No. 5 — (E16) No. 1:
#3 (B136) No. 4 — (E6) No. 1:
#4 (B136) No. 3 — (E17) No. 1:
#5 (B136) No. 2 — (E43) No. 1:
#6 (B136) No. 1 — (E44) No. 1:
5 CHECK FUEL INJECTOR.
Measure the resistance between fuel injector
terminals on faulty cylinder.
Terminal
No. 1 — No. 2:
Check
Is any other DTC displayed?
Is the voltage more than 10 V? Go to step 7.
−
):
−
):
−
):
−
):
−
):
−
):
Is the resistance more than 1
MΩ?
Is the resistance less than 1
Ω?
Is the resistance 5 — 20 Ω
EN(H6DO)(diag)-181
ENGINE (DIAGNOSTICS)
Yes
Check DTC using Go to step 2.
the List of Diag-
nostic Trouble
Code (DTC). <Ref.
to
EN(H6DO)(diag)-
66, List of Diag-
nostic Trouble
Code (DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0301, P0302,
P0303, P0304,
P0305 and P0306.
Go to step 3.
Go to step 4. Repair the ground
short circuit of har-
ness between fuel
injector and ECM
connector.
Go to step 5. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit of
harness between
ECM and fuel
injector connector
• Poor contact in
coupling connector
Go to step 6. Replace the faulty
fuel injector. <Ref.
to FU(H6DO)-26,
Fuel Injector.>
No