1997 SUBARU LEGACY ignition

B2M0939A
11BA8CHECK HARNESS BETWEEN ECM AND
FUEL PUMP CONNECTOR.
1) Connect connector to fuel sub meter unit.
2) Turn ignition switch to ON.
3) Measure voltage between fuel pump connector and
chassis ground.
: Connector & terminal
(R58) No. 3 (+)—Chassis ground ():
Is the voltage less than 1 V?
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between fuel pump connector
and junction A on rear wiring harness

Poor contact in fuel sub meter unit connector

Poor contact in fuel pump connector

Poor contact in coupling connector (R57)
: Go to next step 4).
H2M1418B
4) Turn ignition switch to OFF.
5) Disconnect connector from ECM.
6) Turn ignition switch to ON.
7) Measure voltage between ECM connector and chassis
ground.
: Connector & terminal
(B84) No. 27 (+)—Chassis ground:
Is the voltage less than 1 V?
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM connector and
junction A on rear wiring harness

Poor contact in coupling connector (B97)
: Repair connector.
NOTE:
In this case, repair the following:

Poor contact in fuel pump connector

Poor contact in fuel sub meter unit

Poor contact in ECM connector
496
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostic Chart with Trouble Code for RHD Vehicles

H2M1408B
11CI1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 10 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Go to next.
: Go to step11CI2.
: 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.
B2M0930A
11CI2CHECK HARNESS BETWEEN FUEL
TANK PRESSURE CONTROL SOLENOID
VALVE AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from fuel tank pressure control
solenoid valve and ECM.
3) Measure resistance of harness between fuel tank pres-
sure control solenoid valve connector and chassis ground.
: Connector & terminal
(R68) No. 2—Chassis ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
ECM and fuel tank pressure control solenoid
valve connector.
: Go to next step 4).
529
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostic Chart with Trouble Code for RHD Vehicles

B2M0932A
11CI4CHECK POWER SUPPLY TO FUEL TANK
PRESSURE CONTROL SOLENOID
VA LV E .
1) Turn ignition switch to ON.
2) Measure voltage between fuel tank pressure control
solenoid valve and chassis ground.
: Connector & terminal
(R68) No. 1 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Go to next.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between main relay and fuel tank
pressure control solenoid valve connector

Poor contact in coupling connectors (B97 and R57)

Poor contact in main relay connector
: Is there poor contact in fuel tank pressure
control solenoid valve connector?
: Repair poor contact in fuel tank pressure control
solenoid valve connector.
: Contact with SOA service.
NOTE:
Inspection by DTM is required, because probable cause is
deterioration of multiple parts.
531
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostic Chart with Trouble Code for RHD Vehicles

H2M1408B
11CJ1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 10 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Go to step11CJ2.
: Go to next.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
H2M1408B
11CJ2CHECK HARNESS BETWEEN FUEL
TANK PRESSURE CONTROL SOLENOID
VALVE AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from fuel tank pressure control
solenoid valve.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 10 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Repair battery short circuit in harness between
ECM and fuel tank pressure control solenoid
valve connector. After repair, replace ECM.
: Go to next step 5).
533
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostic Chart with Trouble Code for RHD Vehicles

B2M0929
5) Turn ignition switch to OFF.
6) Measure resistance between fuel tank pressure control
solenoid valve terminals.
: Terminals
No. 1—No. 2:
Is the resistance less than 1Ω?
: Replace fuel tank pressure control solenoid valve
and ECM.
: Go to next.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
534
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostic Chart with Trouble Code for RHD Vehicles

H2M1370B
11CM1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 35 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Go to step11CM2.
: Go to next.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
H2M1370B
11CM2CHECK HARNESS BETWEEN VENT
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from vent control solenoid valve.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 35 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Repair battery short circuit in harness between
ECM and vent control solenoid valve connector.
After repair, replace ECM.
: Go to next step 5).
538
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostic Chart with Trouble Code for RHD Vehicles

H2M1238A
5) Turn ignition switch to OFF.
6) Measure resistance between vent control solenoid
valve terminals.
: Terminals
No. 1—No. 2:
Is the resistance less than 1Ω?
: Replace vent control solenoid valve and ECM.
: Go to next.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Replace ECM.
539
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostic Chart with Trouble Code for RHD Vehicles

4. Schematic
B3M0376A
1Ignition switch

2Combination meter

3Speedometer circuit

4Inhibitor switch

5Vehicle speed sensor 2

6Vehicle speed sensor 1

7Throttle position sensor

8Diagnosis switch

9FWD switch (AWD)
10Data link connector

11ABS control module

12Engine speed signal

13Torque control signal

14Torque control cut signal

15Mass air flow signal

16ATF temperature sensor

17Dropping resistor
18Duty solenoid A

19Duty solenoid B

20Duty solenoid C (AWD)

21Shift solenoid 1

22Shift solenoid 2

23Shift solenoid 3

24Brake switch

25Cruise set switch
8
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
4. Schematic