Subaru FORESTER 2001 Service Manual page 176

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM connector
and chassis ground on faulty cylinders.
Connector & terminal
#1 (B137) No. 1 (+) — Chassis ground
(−):
#2 (B136) No. 6 (+) — Chassis ground
(−):
#3 (B136) No. 5 (+) — Chassis ground
(−):
#4 (B136) No. 4 (+) — Chassis ground
(−):
3 CHECK HARNESS BETWEEN FUEL INJEC-
TOR AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from fuel injector on
faulty cylinders.
3) Disconnect connector from ECM.
4) Measure voltage between ECM connector
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:
4 CHECK HARNESS BETWEEN FUEL INJEC-
TOR AND ECM CONNECTOR.
Measure resistance of harness connector
between ECM connector and fuel injector on
faulty cylinders.
Connector & terminal
#1 (B137) No. 1 — (E5) No. 1:
#2 (B136) No. 6 — (E16) No. 1:
#3 (B136) No. 5 — (E6) No. 1:
#4 (B136) No. 4 — (E17) No. 1:
Step
Does the Subaru Select
Monitor or OBD-II general
scan tool indicate DTC
P0106, P0107, P0108,
P0117, P0118 or P0125?
Is the voltage more than 10
V?
Is the resistance less than
10 Ω?
Is the resistance less than
1 Ω?
EN(DOHC TURBO)-175
Check Yes
Inspect DTC
P0106, P0107,
P0108, P0117,
P0118 or P0125
using "List of
Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(DOHC
TURBO)-82, List
of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0301, P0302,
P0303 and
P0304.
Go to step 7.
Repair ground
short circuit in
harness between
fuel injector and
ECM connector.
Go to step 5.
Engine (Diagnostics)
No
Go to step 2.
Go to step 3.
Go to step 4.
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
ECM and fuel
injector connector
¼ Poor contact in
coupling connec-
tor