Subaru LEGACY 2003 Service Manual page 43

DIAGNOSTICS FOR ENGINE STARTING FAILURE
Step
2 CHECK DTC.
<Ref. to EN(H4SOw/oOBD)-24, OPERATION,
Read Diagnostic Trouble Code (DTC).>
Is the trouble code stored in memory? <Ref. to
EN(H4SOw/oOBD)-57, LIST, List of Diagnostic
Trouble Code (DTC).>
3 CHECK INPUT SIGNAL FOR STARTER MO-
TOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from starter motor.
3) Turn ignition switch to ST.
4) Measure power supply voltage between
starter motor connector terminal and
engine ground.
Connector & terminal
(B14) No. 1 (+) — Engine ground ( − − − − ):
NOTE:
On AT vehicles, place the selector lever in the
"P" or "N" position.
Does the measured value exceed the spec-
ified value?
4 CHECK GROUND CIRCUIT OF STARTER
MOTOR.
1) Turn ignition switch to OFF.
2) Disconnect terminal from starter motor.
3) Measure resistance of ground cable
between ground cable terminal and engine
ground.
Is the measured value less than the speci-
fied value?
5 CHECK HARNESS BETWEEN ECM AND
STARTER MOTOR CIRCUIT.
1) Turn ignition switch to OFF.
2) Measure resistance between starter motor
and ECM.
Connector & terminal
(B14) No. 1 — Engine ground:
Is the measured value less than the speci-
fied value?
6 CHECK HARNESS BETWEEN ECM AND
STARTER MOTOR CIRCUIT.
1) Turn ignition switch to START.
2) Measure resistance of fuse.
Connector & terminal
(B14) No. 1 — Engine ground:
Is the measured value less than the speci-
fied value?
Value
Trouble code is stored in mem-
ory.
10 V
5 Ω
1 Ω
1 Ω
EN(H4SOw/oOBD)-41
ENGINE (DIAGNOSTICS)
Yes
Record DTC. Go to step 3.
Repair the trouble
cause. <Ref. to
EN(H4SOw/
oOBD)-59, Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
Go to step 4. Go to step 5.
Check starter Repair open circuit
motor. <Ref. to of ground cable.
SC(H4SO)-6,
Starter.>
Repair ground Go to step 6.
short circuit.
Go to step 7. Repair ground
short circuit.
No