SUBARU LEGACY 1997 Service Repair Manual

10CY1
CHECK DTC P1700 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P1700?
: Check throttle position sensor circuit. [T7K0].>
: It is not necessary to inspect DTC P1700.
410
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0669
CZ: DTC P1701
—CRUISE CONTROL SET SIGNAL CIRCUIT
MALFUNCTION FOR AUTOMATIC
TRANSMISSION—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
WIRING DIAGRAM:
OBD0512
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

OBD0514A
10CZ1CHECK 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.
411
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

: 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 step10CZ2.
OBD0513A
10CZ2
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 resistance 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.
412
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1143
DA: DTC P1702
—AUTOMATIC TRANSMISSION DIAGNOSIS
INPUT SIGNAL CIRCUIT LOW INPUT—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
WIRING DIAGRAM:
B2M0614
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

413
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10DA1
CHECK TRANSMISSION TYPE.
: Is transmission type AT?
: Go to step10DA2.
: Check AT/MT identification circuit. [T10DD0].>
B2M0615A
10DA2CHECK 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 less than 1 V?
: Go to step10DA3.
: Even if MIL lights up, the circuit has returned to a
normal condition at this time.
NOTE:
In this case, repair the following:

Poor contact in ECM connector

Poor contact in TCM connector
B2M0616A
10DA3CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM and TCM.
3) Measure resistance of harness between ECM and
chassis ground.
: Connector & terminal
(B84) No. 80—Chassis ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
ECM and TCM connector.
: Go to step10DA4.
414
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0615A
10DA4
CHECK ECM.
1) Connect connector to ECM.
2) Turn ignition switch to ON.
3) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 80 (+)—Chassis ground ():
Is the voltage more than 5 V?
: Replace TCM.
: Replace ECM.
415
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1144
DB: DTC P1722
—AUTOMATIC TRANSMISSION DIAGNOSIS
INPUT SIGNAL CIRCUIT HIGH INPUT—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
WIRING DIAGRAM:
B2M0614
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

416
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10DB1
CHECK TRANSMISSION TYPE.
: Is transmission type AT?
: Go to step10DB2.
: Check AT/MT identification circuit. [T10DD0].>
B2M0615A
10DB2CHECK 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 10 V?
: Repair battery short circuit in harness between
ECM and TCM connector. After repair, replace
ECM.
: Go to step10DB3.
B2M0615A
10DB3CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
Measure voltage between ECM connector and chassis
ground.
: Connector & terminal
(B84) No. 80 (+)—Chassis ground ():
Is the voltage more than 4 V?
: Go to step10DB4.
: Go to next.
B2M0615A
: Connector & terminal
(B84) No. 80 (+)—Chassis ground ():
Is the voltage less than 1 V?
: Repair poor contact in ECM connector.
: Go to next.
417
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0615A
: Connector & terminal
(B84) No. 80 (+)—Chassis ground ():
Does the voltage change from1Vto4V
while monitoring the value with voltage
meter?
: Even if MIL lights up, the circuit has returned to a
normal condition at this time.
NOTE:
In this case, repair the following:

Poor contact in ECM connector

Poor contact in TCM connector
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable cause is
deterioration of multiple parts.
B2M1164A
10DB4CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
Measure voltage between TCM and chassis ground.
: Connector & terminal
(B55) No. 11 (+)—Chassis ground ():
Is the voltage more than 4 V?
: Go to next.
: Repair open circuit in harness between ECM and
TCM connector.
: Is there poor contact in TCM connector?
: Repair poor contact in TCM connector.
: Check TCM power supply line and grounding line.
418
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M1147
DC: DTC P1742
—AUTOMATIC TRANSMISSION DIAGNOSIS
INPUT SIGNAL CIRCUIT MALFUNCTION—
DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
WIRING DIAGRAM:
B2M0614
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.

419
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles