SUBARU LEGACY 1996 Service Repair Manual

OBD0458
BI: DTC P1100
—STARTER SWITCH CIRCUIT
MALFUNCTION (ST
—SW)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Failure of engine to start
10BI1Check operation of starter motor.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
WIRING DIAGRAM:
B2M0516
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10. Diagnostics Chart with Trouble Code

10BI1CHECK OPERATION OF STARTER
MOTOR.
: Does starter motor operate when ignition
switch to“ST”?
NOTE:

On AT vehicles, place the inhibitor switch in the“P”or“N”
position.

On MT vehicles, depress the clutch pedal.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and starter motor
connector.

Poor contact in ECM connector.
: Check starter motor circuit.
NOTE:
For the diagnostic procedure on starter motor circuit, refer
to 2-7 [T8B0].
314
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0668
BJ: DTC P1101
—NEUTRAL POSITION SWITCH CIRCUIT
MALFUNCTION [MT VEHICLES] (N/P
—SW)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Erroneous idling
10BJ1Check input signal for ECM.
10BJ2Check neutral position switch.
10BJ3Check harness between ECM and neutral
position switch.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
WIRING DIAGRAM:
B2M0588


315
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0589A
10BJ1
CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 82 (+)—Chassis ground ():
Is the voltage between 4.5 and 5.5 V in neu-
tral position?
: Go to next.
: Go to step10BJ2.
B2M0589A
: Connector & terminal
(B84) No. 82 (+)—Chassis ground ():
Is the voltage less than1Vinother posi-
tions?
: Go to next.
: Go to step10BJ2.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
OBD0469A
10BJ2
CHECK NEUTRAL POSITION SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connector from transmission harness.
3) Measure resistance between transmission harness and
connector terminals.
: Connector & terminal
(T2) No. 1—No. 2:
Is the resistance more than 1 MΩin neutral
position?
: Go to next.
: Repair short circuit in transmission harness or
replace neutral position switch.
: Connector & terminal
(T2) No. 1—No. 2:
Is the resistance less than 1Ωin other posi-
tions?
: Go to step10BJ3.
: Repair open circuit in transmission harness or
replace neutral position switch.
316
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0590A
10BJ3CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH.
1) Disconnect connector from ECM.
2) Measure resistance of harness between ECM and
transmission harness connector.
: Connector & terminal
(B84) No. 82—(B25) No. 1:
Is the resistance less than 1Ω?
: Go to next step 3).
: Repair open circuit in harness between ECM and
transmission harness connector.
B2M0591A
3) Measure resistance between ECM and chassis ground.
: Connector & terminal
(B84) No. 82—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between ECM and
transmission harness connector.
: Go to next step 4).
OBD0472A
4) Measure resistance of harness between transmission
harness connector and engine ground.
: Connector & terminal
(B25) No. 2—Engine ground:
Is the resistance less than 5Ω?
: Go to next.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between transmission harness
connector and engine grounding terminal

Poor contact in coupling connector (B22)
: Is there poor contact in transmission har-
ness connector?
: Repair poor contact in transmission harness con-
nector.
: Replace ECM.
317
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0668
BK: DTC P1101
—NEUTRAL POSITION SWITCH CIRCUIT
MALFUNCTION [AT VEHICLES] (N/P
—SW)
—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Erroneous idling
10BK1Check input signal for ECM.
10BK2Check harness between ECM and inhibitor
switch.
10BK3Check inhibitor switch.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>


318
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10. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:
B2M0592
B2M0593A
10BK1
CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 82 (+)—Chassis ground ():
Is the voltage less than1Vin“N”and“P”
positions?
: Go to next.
: Go to step10BK2.
B2M0593A
: Connector & terminal
(B84) No. 82 (+)—Chassis ground ():
Is the voltage between 4.5 and 5.5 V in other
positions?
: Go to next.
: Go to step10BK2.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0594A
10BK2CHECK HARNESS BETWEEN ECM AND
INHIBITOR SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and transmission.
3) Measure resistance of harness between ECM and
transmission harness connector.
: Connector & terminal
(B84) No. 82—(B12) No. 12:
Is the resistance less than 1Ω?
: Go to next step 4).
: Repair open circuit in harness between ECM and
transmission harness connector.
B2M0595A
4) Measure resistance of harness between ECM and
chassis ground.
: Connector & terminal
(B84) No. 82—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between ECM and
transmission harness connector.
: Go to next step 5).
OBD0479A
5) Measure resistance of harness between transmission
harness connector and engine ground.
: Connector & terminal
(B12) No. 11—Engine ground:
Is the resistance less than 5Ω?
: Go to step10BK3.
: Repair open circuit in inhibitor switch ground line.
320
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10. Diagnostics Chart with Trouble Code

OBD0480A
10BK3
CHECK INHIBITOR SWITCH.
Measure resistance between transmission harness con-
nector receptacle’s terminals.
: Connector & terminal
(T3) No. 12—No. 11:
Is the resistance less than 1Ωin“N”and
“P”positions?
: Go to next.
: Repair open circuit in transmission harness or
replace inhibitor switch.
: Connector & terminal
(T3) No. 12—No. 11:
Is the resistance more than 1 MΩin other
positions?
: Go to next.
: Repair short circuit in transmission harness or
replace inhibitor switch.
: Is there any fault in selector cable connec-
tion to inhibitor switch?
: Repair selector cable connection. <Ref. to 3-2
[W2B2].>
: Replace ECM.
321
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0481
BL: DTC P1102
—PRESSURE SOURCES SWITCHING
SOLENOID VALVE CIRCUIT MALFUNCTION
(BR)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Erroneous idling

Failure of engine to start
10BL1Check output signal from ECM.

10BL2Check harness between ECM and pressure
sources switching solenoid valve connector.
10BL3Check harness between ECM and pressure
sources switching solenoid valve connector.
10BL4Check pressure sources switching solenoid
valve.
10BL5Check power supply to pressure sources
switching solenoid valve.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODE.
<Ref. to 2-7 [T3D0] and [T3E0].>



322
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code