SUBARU LEGACY 1996 Service Repair Manual

OBD0514A
10BT1CHECK HARNESS BETWEEN TCM AND
CCM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM and CCM.
3) Measure resistance of harness between TCM and CCM
connector.
: Connector & terminal
(B56) No. 3—(B94) No. 3:
Is the resistance less than 1Ω?
: Go to next step 4).
: Repair open circuit in harness between TCM and
CCM connector.
OBD0515A
4) Measure resistance of harness between TCM and
chassis ground.
: Connector & terminal
(B56) No. 3—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between TCM and
CCM connector.
: Go to step10BT2.
363
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0513A
10BT2
CHECK INPUT SIGNAL FOR TCM.
1) Connect connector to TCM and CCM.
2) Lift-up the vehicle or set the vehicle on free rollers.
CAUTION:
On AWD models, raise all wheels off ground.
3) Start the engine.
4) Cruise control main switch to ON.
5) TCS OFF switch to ON. (with TCS models only)
6) Move selector lever to“D”and slowly increase vehicle
speed to 50 km/h (31 MPH).
7) Cruise control set switch to ON.
8) Measure voltage between TCM and chassis ground.
: Connector & terminal
(B56) No. 3 (+)—Chassis ground ():
Is the voltage less than 1 V?
: Go to next.
: Check cruise control set circuit. [T7A0].>
: Is there poor contact in TCM connector?
: Repair poor contact in TCM connector.
: Replace TCM.
364
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

OBD0516
BU: DTC P1702
—AUTOMATIC TRANSMISSION DIAGNOSIS
INPUT SIGNAL CIRCUIT MALFUNCTION
(ATDIAG)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
10BU1Check transmission type.
10BU2Check harness between ECM and TCM
connector.
10BU3Check harness between ECM and TCM
connector.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
B2M0614


365
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

10BU1
CHECK TRANSMISSION TYPE.
: Is transmission type AT?
: Go to step10BU2.
: Check AT/MT identification circuit. [T10BW0].>
B2M0615A
10BU2CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 80 (+)—Chassis ground ():
Is the voltage more than 4 V?
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and TCM connec-
tor

Poor contact in ECM connector

Poor contact in TCM connector
: Go to next.
: Connector & terminal
(B84) No. 80 (+)—Chassis ground ():
Is the voltage less than 1 V?
: Go to step10BU3.
: Although MIL illuminates, circuit is now normal.
NOTE:
In this case, repair the following:

Poor contact in ECM connector

Poor contact in TCM connector
366
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0616A
10BU3CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between ECM and
chassis ground.
: Connector & terminal
(B84) No. 80—Chassis ground:
Is the resistance less than 10Ω?
: Repair short circuit in harness between ECM and
TCM connector.
: Repair poor contact in ECM connector.
367
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0947
BV: DTC P0461
—FUEL LEVEL SENSOR CIRCUIT RANGE/
PERFORMANCE PROBLEM (EXERR22)—
DTC DETECTING CONDITION:

Two consecutive trips with fault
10BV1Check DTC P1402 on display.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:

LHD Model
B2M0933
368
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

WIRING DIAGRAM:

RHD Model
B2M1021
10BV1
CHECK DTC P1402 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P1402?
: Inspect DTC P1402 using“10. Diagnostics Chart
with Trouble Code 2-7 [T1000]”.
NOTE:
In this case, it is not necessary to inspect this trouble.
: Replace fuel sending unit and fuel sub meter unit.
369
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

BW:—AT/MT IDENTIFICATION CIRCUIT
MALFUNCTION [MT VEHICLES]—
10BW1Check harness between ECM connector and
engine grounding terminal.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

WIRING DIAGRAM:
B2M0617
370
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

B2M0618A
10BW1CHECK HARNESS BETWEEN ECM CON-
NECTOR AND ENGINE GROUNDING
TERMINAL.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 81 (+)—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)
: Go to next.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable cause is
deterioration of multiple parts.
371
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

1. Supplemental Restraint System
“Airbag”
Airbag system wiring harness is routed near the transmis-
sion control module (TCM).

All Airbag system wiring harness and connectors
are colored yellow. Do not use electrical test equip-
ment on these circuit.

Be careful not to damage Airbag system wiring har-
ness when performing diagnostics and servicing the
TCM.
B3M0173A
2. Pre-inspection
1. ATF LEVEL
Make sure that ATF level is in the specification.
B3M0174A
2. FRONT DIFFERENTIAL OIL LEVEL
Make sure that front differential oil level is in the specifica-
tion.
2
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
1. Supplemental Restraint System“Airbag”- 2. Pre-inspection