SUBARU LEGACY 1997 Service Repair Manual

B2M1123
CE: DTC P1121
—NEUTRAL POSITION SWITCH CIRCUIT
LOW INPUT [AT VEHICLES]—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Erroneous idling
WIRING DIAGRAM:
B2M1116
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10CE1
CHECK DTC P0705 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0705?
: Inspect DTC P0705 using“10. Diagnostics Chart
with Trouble Code”. <Ref. to 2-7 [T10A0].>
: Go to step10CE2.
B2M0593A
10CE2
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 other
positions?
: Even if MIL lights up, the circuit has returned to a
normal condition at this time.
: Go to step10CE3.
10CE3
CHECK INHIBITOR SWITCH TYPE.
: Is inhibitor switch type plastic body?
: Go to step10CE4.
: Go to step10CE7.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0595A
10CE4CHECK HARNESS BETWEEN ECM AND
TRANSMISSION HARNESS CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and transmission
harness connector.
3) Measure resistance of harness between ECM connec-
tor and chassis ground.
: Connector & terminal
(B84) No. 82—Chassis ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
ECM and transmission harness connector.
: Go to step10CE5.
10CE5CHECK TRANSMISSION HARNESS CON-
NECTOR.
1) Disconnect connector from inhibitor switch.
2) Measure resistance of harness between transmission
harness connector and engine ground.
: Connector & terminal
(T3) No. 12—Engine ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
transmission harness and inhibitor switch connec-
tor.
: Go to step10CE6.
B2M1119
10CE6
CHECK INHIBITOR SWITCH.
Measure resistance between inhibitor switch connector
receptacle’s terminals.
: Terminals
No. 1—No. 2:
Is the resistance more than 1 MΩin other
positions?
: Go to next.
: Replace inhibitor switch.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

: Is there any fault in selector cable connec-
tion to inhibitor switch?
: Repair selector cable connection. <Ref. to 3-2
[W2B2].>
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable cause is
deterioration of multiple parts.
B2M0595A
10CE7CHECK HARNESS BETWEEN ECM AND
TRANSMISSION HARNESS CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and transmission
harness connector.
3) 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 step10CE8.
B2M1288A
10CE8
CHECK INHIBITOR SWITCH.
Measure resistance between transmission harness con-
nector receptacle’s terminals.
: Connector & terminal
(T3) No. 12—No. 11:
Is the resistance more than 1 MΩin 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].>
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable cause is
deterioration of multiple parts.
353
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1124
CF: DTC P1122
—PRESSURE SOURCES SWITCHING
SOLENOID VALVE CIRCUIT HIGH INPUT—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

Erroneous idling

Failure of engine to start
WIRING DIAGRAM:
B2M1308
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODE.
<Ref. to 2-7 [T3D0] and [T3E0].>
354
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0596A
10CF1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 15 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Go to step10CF2.
: Go to next.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
B2M0596A
10CF2CHECK HARNESS BETWEEN ECM AND
PRESSURE SOURCES SWITCHING
SOLENOID VALVE 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 chassis ground.
: Connector & terminal
(B84) No. 15 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Repair battery short circuit in harness between
ECM and pressure sources switching solenoid
valve connector. After repair, replace ECM.
: Go to next step 5).
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1120
5) Turn ignition switch to OFF.
6) Measure resistance between pressure sources switch-
ing solenoid valve connector terminals.
: Terminals
No. 1—No. 2:
Is the resistance less than 1Ω?
: 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.
356
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1125
CG: DTC P1124
—TCS SIGNAL CIRCUIT HIGH INPUT—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
TROUBLE SYMPTOM:

No operation TCS

TCS warning light remains illuminated.
WIRING DIAGRAM:
B2M0602
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
<Ref. to 2-7 [T3D0] and [T3E0].>
357
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10CG1CHECK IF THE VEHICLE IS EQUIPPED
WITH TCS.
: Is the vehicle equipped with TCS?
: Go to step10CG2.
: Go to step10CG5.
B2M0603A
10CG2
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 61 (+)—Chassis ground ():
Is the voltage more than 2 V?
: Go to step10CG3.
: Go to step10CG4.
B2M0603A
10CG3CHECK HARNESS BETWEEN ECM AND
TCS C/M CONNECTOR.
1) Turn ignition switch to OFF.
2) Remove front passenger side seat.
3) Tear off the floor mat.
4) Disconnect connectors from ECM and TCS C/M.
5) Measure voltage between ECM connector and chassis
ground.
: Connector & terminal
(B84) No. 61 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Repair battery short circuit in harness between
ECM and TCS C/M connector.
: Go to next step 6).
B2M0603A
6) Turn ignition switch to ON.
7) Measure voltage between ECM connector and chassis
ground.
: Connector & terminal
(B84) No. 61 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Repair battery short circuit in harness between
ECM and TCS C/M connector.
: Repair poor contact in ECM connector.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0605A
10CG4CHECK HARNESS BETWEEN ECM AND
TCS C/M CONNECTOR.
1) Turn ignition switch to OFF.
2) Remove front passenger side seat.
3) Tear off the floor mat.
4) Disconnect connectors from ECM and TCS C/M.
5) Measure resistance of harness between ECM and TCS
C/M connector.
: Connector & terminal
(B84) No. 61—(P6) No. 4:
Is the resistance less than 1Ω?
: Repair poor contact in TCS C/M connector.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and TCS C/M
connector

Poor contact in ECM connector

Poor contact in TCS C/M connector

Poor contact in S.M.J. connector (B63)
B2M0606A
10CG5
CHECK ECM CONNECTOR.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 75 (+)—Chassis ground ():
Is the voltage more than 2 V?
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM connector and
engine grounding terminal

Poor contact in engine grounding terminal

Poor contact in coupling connector (B22)
: Repair poor contact in ECM connector.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles