Diagnostics For Engine Starting Failure - Subaru FORESTER 2001 Service Manual

DIAGNOSTICS FOR ENGINE STARTING FAILURE

No.
1 CHECK OPERATION OF STARTER MOTOR. Does starter motor operate
2 CHECK DTC.
<Ref. to EN(DOHC TURBO)-43,
OPERATION, Read Diagnostic Trouble
Code.>
3 CHECK INPUT SIGNAL FOR STARTER
MOTOR.
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.
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.
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:
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:
7 CHECK HARNESS BETWEEN BATTERY
AND IGNITION SWITCH CONNECTOR.
1) Ignition switch to OFF.
2) Disconnect connector from ignition switch.
3) Measure power supply voltage between
ignition switch connector and chassis ground.
Connector & terminal
(B72) No. 1 (+) — Chassis ground (−):
8 CHECK HARNESS BETWEEN BATTERY
AND IGNITION SWITCH CONNECTOR.
1) Connect connector to ignition switch.
2) Turn ignition switch to START.
3) Measure voltage between ignition switch
and chassis ground.
Connector & terminal
(B72) No. 3 (+) — Chassis ground (−):
Step
when the switch starts?
Is the trouble code stored
in memory? <Ref. to
EN(DOHC TURBO)-82,
LIST, List of Diagnostic
Trouble Code (DTC).>
Is the voltage more than 10
V?
Is resistance less than 5
Ω?
Is resistance less than 1
Ω?
Is resistance less than 1
Ω?
Is the voltage more than 10
V?
Is the voltage more than 10
V?
EN(DOHC TURBO)-65
Check Yes
Go to step 2.
Record DTC.
Repair the trouble
case. <Ref. to
EN(DOHC
TURBO)-90, Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
Go to step 4.
Check starter
motor. <Ref. to
SC-5, Starter.>
Repair ground
short circuit.
Go to step 7.
Go to step 8.
Go to step 9.
Engine (Diagnostics)
No
Go to step 3.
Go to step 3.
Go to step 5.
Repair open cir-
cuit of ground
cable.
Go to step 6.
Repair ground
short circuit.
Repair open cir-
cuit in harness
between ignition
switch and bat-
tery.
Replace ignition
switch.