1997 SUBARU LEGACY ignition

10BA1CHECK SPEEDOMETER AND TACHOM-
ETER OPERATION IN COMBINATION
METER.
: Does speedometer and tachometer operate
normally?
: Go to step10BA3.
: Go to step10BA2.
B6M0121
10BA2CHECK GROUND CIRCUIT OF COMBINA-
TION METER.
1) Turn ignition switch to OFF.
2) Pull out combination meter from instrument panel. to 6-2 [W13A1].>
3) Disconnect connector from combination meter.
B2M0934A
4) Measure resistance of harness between combination
meter connector and chassis ground.
: Connector & terminal
(i12) No. 1—Chassis ground:
Is resistance less than 5Ω?
: Repair or replace combination meter.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between combination meter con-
nector and grounding terminal

Poor contact in combination meter connector

Poor contact in grounding terminal
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H2M1414B
10BA3CHECK INPUT SIGNAL FOR ECM.
(USING VOLTAGE METER AND SUBARU
SELECT MONITOR.)
1) Turn ignition switch to ON. (Engine OFF)
2) Measure voltage between ECM connector and chassis
ground.
: Connector & terminal
(B84) No. 27 (+)—Chassis ground ():
Is the voltage more than 4.75 V?
: Go to step10BA4.
: Even if MIL lights up, the circuit has returned to a
normal condition at this time. A temporary poor
contact of the connector may be the cause.
NOTE:
In this case, repair the following:

Poor contact in fuel pump connector

Poor contact in combination meter connector

Poor contact in ECM connector

Poor contact in coupling connector (i3, B99, B22, B98
and R57)
G2M0340
10BA4
CHECK FUEL LEVEL SENSOR.
1) Turn ignition switch to OFF.
2) Remove fuel pump access hole lid located on the right
rear of trunk compartment floor (Sedan) or luggage com-
partment floor (Wagon).
B2M0935
3) Disconnect connector from fuel pump.
4) Measure resistance between connector terminals of
fuel pump.
: Terminals
No. 3—No. 5:
Is the resistance less than 100Ω?
: Go to step10BA5.
: Replace fuel sending unit.
G2M0863
10BA5
CHECK FUEL SUB LEVEL SENSOR.
1) Remove service hole cover located on the left rear of
trunk compartment floor (Sedan) or luggage compartment
floor (Wagon).
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10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0938A
10BA7CHECK GROUND CIRCUIT OF FUEL
LEVEL SENSOR.
Measure resistance of harness between fuel pump con-
nector and chassis ground.
: Connector & terminal
(R58) No. 5—Chassis ground:
Is the resistance less than 5Ω?
: Go to step10BA8.
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between fuel pump connector
and chassis grounding terminal

Poor contact in fuel pump connector

Poor contact in coupling connectors (R57, B98 and B22)
B2M0939A
10BA8CHECK 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).
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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 (B98)
: 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
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles

10BB1CHECK SPEEDOMETER OPERATION IN
COMBINATION METER.
: Does speedometer operate normally?
: Go to step10BB2.
: Check speedometer and vehicle speed sensor
.
B2M0573A
10BB2CHECK HARNESS BETWEEN ECM AND
COMBINATION METER CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from TCM.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 83 (+)—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 and combination
meter connector

Poor contact in ECM connector

Poor contact in combination meter connector

Poor contact in coupling connector (B37)
: Go to step10BB3.
B2M0574A
10BB3CHECK HARNESS BETWEEN ECM AND
COMBINATION METER CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between ECM connec-
tor and chassis ground.
: Connector & terminal
(B84) No. 83—Chassis ground:
Is the resistance less than 10Ω?
: Repair ground short circuit in harness between
ECM and combination meter 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

10BC1
CHECK AIR INTAKE SYSTEM.
1) Turn ignition switch to ON.
2) Start engine, and idle it.
: Is there a fault in air intake system?
NOTE:
Check the following items.

Loose installation of intake manifold, idle air control sole-
noid valve and throttle body

Cracks of intake manifold gasket, idle air control sole-
noid valve gasket and throttle body gasket

Loose connections and cracks of idle air control solenoid
valve by-pass hoses

Disconnections of vacuum hoses
: Repair or replace air intake system.
: Go to step10BC2.
B2M0576A
10BC2
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 13 (+)—Chassis ground ():
Is the voltage more than 3 V?
: Go to next.
: Go to step10BC4.
: Connector & terminal
(B84) No. 14 (+)—Chassis ground ():
Is the voltage more than 3 V?
: Go to next step 3).
: Go to step10BC4.
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B2M0576A
3) Turn ignition switch to OFF.
4) Disconnect connector from idle air control solenoid
valve.
5) Turn ignition switch to ON.
6) Measure voltage between ECM and chassis ground.
: Connector & terminal
(B84) No. 13 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Repair battery short circuit in harness between
ECM and idle air control solenoid valve connector.
After repair, replace ECM.
: Go to next.
: Connector & terminal
(B84) No. 14 (+)—Chassis ground ():
Is the voltage more than 10 V?
: Repair battery short circuit in harness between
ECM and idle air control solenoid valve connector.
After repair, replace ECM.
: Go to next.
: Is there poor contact in ECM connector?
: Repair poor contact in ECM connector.
: Go to step10BC3.
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10. Diagnostic Chart with Trouble Code for LHD Vehicles

B2M0769
10BC3CHECK IDLE AIR CONTROL SOLENOID
VA LV E .
1) Turn ignition switch to OFF.
2) Measure resistance between idle air control solenoid
valve connector terminals.
: Terminals
No. 1—No. 2:
Is the resistance more than 20Ω?
: Replace idle air control solenoid valve.
: Go to next.
: Terminals
No. 2—No. 3:
Is the resistance more than 20Ω?
: Replace idle air control solenoid valve.
: Go to next.
: Terminals
No. 1—No. 2:
Is the resistance less than 5Ω?
: Replace idle air control solenoid valve and ECM.
: Go to next.
: Terminals
No. 2—No. 3:
Is the resistance less than 5Ω?
: Replace idle air control solenoid valve and ECM.
: Go to next step 3).
B2M0577
3) Remove idle air control solenoid valve. [W12A0].>
4) Check operation of idle air control solenoid valve.
: Is idle air control solenoid valve fully
opened when applying the battery to termi-
nals No. 2 (+) and No. 1 ()?
: Go to next.
: Clean idle air control solenoid valve. [W12B0].>
OBD0684
: Is idle air control solenoid valve fully closed
when applying the battery to terminals No. 2
(+) and No. 3 ()?
: Go to step10BC4.
: Clean idle air control solenoid valve. [W12B0].>
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostic Chart with Trouble Code for LHD Vehicles