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9. Diagnostics for Engine Starting
Failure
A: BASIC DIAGNOSTICS CHART
Inspection of starter motor circuit.
Inspection of ECM power supply and ground line.
Inspection of ignition control system.
Inspection of fuel pump circuit.
Inspection of fuel injector circuit.
Inspection of crankshaft position sensor circuit.
Inspection of camshaft position sensor circuit.
Inspection using Subaru select monitor or OBD-II
general scan tool or inspection using“10. General
Diagnostics Table [T1000]”.
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B: STARTER MOTOR CIRCUIT
1.Check input signal for starter motor.2.Check ground circuit of starter motor.
3.Check harness connector between battery and
ignition switch.
4.
Check inhibitor switch. (AT vehicles only)
Check starter interlock circuit. (MT vehicles
only)
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
[T3D0] and [T3E0].>
WIRING DIAGRAM:
B2M0621
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9. Diagnostics for Engine Starting Failure
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OBD0724
1CHECK INPUT SIGNAL FOR STARTER
MOTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from starter motor.
3) Turn ignition switch to ST.
OBD0100A
4) Measure power supply voltage between starter motor
connector terminal and body.
: Connector & terminal
(B14) No. 1—Body/10 V, or more
NOTE:
On AT vehicles, place the inhibitor switch in the“P”or“N”
position.
On MT vehicles, depress the clutch pedal.
: Go to step 2.
: Go to step 3.
OBD0725
2CHECK 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 body.
: Is resistance less than 10Ω?
: Check starter motor.
: Repair open circuit of ground cable.
3CHECK HARNESS CONNECTOR BETWEEN
BATTERY AND IGNITION SWITCH.
1) Turn ignition switch to OFF.
2) Remove SBF No. 4 from main fuse box.
3) Measure resistance of fuse.
: Is resistance less than 1Ω?
: Replace SBF No. 4.
: Go to next step.
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4) Install SBF No. 4 to main fuse box.
5) Turn ignition switch to ON.
OBD0103A
6) Measure power supply voltage between ignition switch
connector and body.
: Connector & terminal
(B72) No. 1—Body/10 V, or more
: Go to step 4.
: Repair harness between ignition switch connector
and body.
OBD0726A
4CHECK INHIBITOR SWITCH. (AT VEHICLES
ONLY)
1) Turn ignition switch to OFF.
2) Disconnect connector from transmission.
3) Measure resistance between transmission harness
connector receptacle’s terminals.
: Connector & terminal
(T3) No. 11—No. 12/10Ω, or less
: Repair harness between starter motor and ignition
switch connector.
: Repair or replace inhibitor switch.
OBD0654A
4CHECK STARTER INTERLOCK CIRCUIT.
(MT VEHICLES ONLY)
1) Turn ignition switch to“ST”.
2) Measure voltage between clutch switch connector and
body.
: Connector & terminal
(B107) No. 2—Body/10 V, or more
: Replace starter interlock relay.
: Go to next step.
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9. Diagnostics for Engine Starting Failure
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OBD0655A
3) Turn ignition switch to OFF.
4) Measure resistance between clutch switch connector
terminals while depressing the clutch pedal.
: Connector & terminal
(B107) No. 1—No. 2/10Ω, or less
: Repair harness between starter motor and ignition
switch connector.
: Replace clutch switch.
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C: CONTROL MODULE POWER SUPPLY AND
GROUND LINE
1.Check main relay.
2.Check power supply circuit of ECM.
3.Check ground circuit of ECM.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
[T3D0] and [T3E0].>
WIRING DIAGRAM:
LHD model
OBD0105
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9. Diagnostics for Engine Starting Failure
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WIRING DIAGRAM:
RHD model
B2M0445
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9. Diagnostics for Engine Starting Failure
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G2M0444
1
CHECK MAIN RELAY.
1) Turn the ignition switch to OFF.
2) Remove main relay.
3) Connect battery to main relay terminals No. 1 and No.
2.
4) Measure resistance between main relay terminals.
: Terminals
No. 3—No. 5/10Ω, or less
No. 4—No. 6/10Ω, or less
: Go to step 2.
: Replace main relay.
OBD0107A
2
CHECK POWER SUPPLY CIRCUIT OF ECM.
1) Install main relay.
2) Disconnect connectors from ECM.
3) Turn ignition switch to ON.
4) Measure power supply voltage between ECM connec-
tor terminals.
: Connector & terminal
(B84) No. 15—No. 96/10 V, or more
(B84) No. 16—No. 96/10 V, or more
(B84) No. 42—No. 96/10 V, or more
: Go to step 3.
: Repair harness of power supply circuit.
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9. Diagnostics for Engine Starting Failure