SUBARU LEGACY 1995 Service Repair Manual

OBD0473
BE: DTC P1101
—NEUTRAL POSITION SWITCH CIRCUIT
MALFUNCTION [AT VEHICLES] (N
—SW)—
DESCRIPTION:
Refer to“AN: DTC P0705—TRANSMISSION RANGE
SENSOR CIRCUIT MALFUNCTION—[T11AN0]”.
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Erroneous idling
1.Check input signal for ECM.
2.Check harness connector between ECM and
inhibitor switch.
3.Check inhibitor switch.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES. <Ref. to
[T3D0] and [T3E0].>


315
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11. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:
B2M0629
OBD0468A
1
CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and body.
: Connector & terminal
(B84) No. 78—Body / 0 V (“N”and“P”
positions)
(B84) No. 78—Body / 5.0±0.5 V
(Other positions)
Go to next.
: Go to step 2.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM with a new one.
316
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11. Diagnostics Chart with Trouble Code

OBD0477A
2CHECK HARNESS CONNECTOR BETWEEN
ECM AND INHIBITOR SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and transmission.
3) Measure resistance of harness connector between
ECM and transmission.
: Connector & terminal
(B84) No. 78—(B12) No. 12 / 10Ω, or less
: Repair open circuit of harness between ECM con-
nector and transmission connector.
: Go to next step.
OBD0471A
4) Measure resistance of harness connector between
ECM and body.
: Connector & terminal
(B84) No. 78—Body / 1 MΩ, or more
: Repair short circuit of harness between ECM con-
nector and transmission connector.
: Go to next step.
OBD0479A
5) Measure resistance of harness connector between
inhibitor switch and body.
: Connector & terminal
(B12) No. 11—Body / 10Ω, or less
: Go to step 3.
: Repair open circuit of inhibitor switch ground line.
317
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11. Diagnostics Chart with Trouble Code

OBD0480A
3
CHECK INHIBITOR SWITCH.
Measure resistance between transmission connector
receptacle’s terminals.
: Connector & terminal
(T3) No. 12—No. 11 / 10Ω, or less
(“N”and“P”positions)
(T3) No. 12—No. 11 / 1 MΩ, or more
(Other positions)
: Go to next.
: 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 with a new one.
318
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11. Diagnostics Chart with Trouble Code

OBD0481
BF: DTC P1102
—PRESSURE SOURCES SWITCHING
SOLENOID VALVE CIRCUIT MALFUNCTION
(BR)—
DESCRIPTION:
Refer to“D: DTC P0105—PRESSURE SENSOR CIR-
CUIT MALFUNCTION—[T11D0]”.
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Erroneous idling

Failure of engine to start
319
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

1.Check transmission type.
AT
MT
Check AT/MT identification circuit. <Ref. to [T11BN0].>
2.Check output signal from ECM.

3.Check harness connector.
4.Check harness connector.
5.Check pressure sources switching solenoid
valve.
6.Check power supply to pressure sources
switching solenoid valve.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODE. <Ref. to
[T3D0] and [T3E0].>
WIRING DIAGRAM:

LHD model
OBD0156




320
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:

RHD model
B2M0449
1
CHECK TRANSMISSION TYPE.
Refer to flow chart on page 320.
OBD0484A
2
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and body.
: Connector & terminal
(B84) No. 58—Body / 10 V, or more
: Go to step 3.
: Go to step 4.
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11. Diagnostics Chart with Trouble Code

OBD0484A
3
CHECK HARNESS CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from pressure sources switching
solenoid valve.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and body.
: Connector & terminal
(B84) No. 58—Body / 10 V, or more
: Repair short circuit of harness between ECM con-
nector and pressure sources switching solenoid
valve connector and replace ECM.
: Go to next step.
OBD0485
5) Turn ignition switch to OFF.
6) Measure resistance between pressure sources switch-
ing solenoid valve terminals.
: Terminals
No. 1—No. 2/1Ω, or less
: Replace pressure sources switching solenoid
valve and ECM.
: Go to next.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM with a new one.
322
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

OBD0488A
4
CHECK HARNESS CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from pressure sources switching
solenoid valve and ECM.
3) Measure resistance of harness connector between
pressure sources switching solenoid valve and body.
: Connector & terminal
(B1) No. 1—Body / 10Ω, or less
: Repair short circuit of harness between ECM con-
nector and pressure sources switching solenoid
valve connector.
: Go to next step.
OBD0685A
4) Measure resistance of harness connector between
ECM and pressure sources switching solenoid valve.
: Connector & terminal
(B84) No. 58—(B1) No. 1 / 10Ω, or less
: Go to step 5.
: Repair open circuit of harness between ECM con-
nector and pressure sources switching solenoid
valve connector.
OBD0485
5CHECK PRESSURE SOURCES SWITCHING
SOLENOID VALVE.
Measure resistance between pressure sources switching
solenoid valve connector terminals.
: Terminals
No. 1—No. 2 / 10—100Ω
: Go to step 6.
: Replace pressure sources switching solenoid
valve.
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11. Diagnostics Chart with Trouble Code

OBD0676A
6CHECK POWER SUPPLY TO PRESSURE
SOURCES SWITCHING SOLENOID VALVE.
1) Turn ignition switch to ON.
2) Measure voltage between pressure sources switching
solenoid valve harness connector and body.
: Connector & terminal
(B1) No. 2—Body / 10 V, or more
: Confirm good connection at pressure sources
switching solenoid valve connector.
: Repair open circuit of harness between main relay
connector and pressure sources switching sole-
noid valve connector.
324
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11. Diagnostics Chart with Trouble Code