Page 2209 of 3342

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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Page 2210 of 3342

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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Page 2211 of 3342
B2M1126
CH: DTC P1141
—MASS AIR FLOW SENSOR CIRCUIT
RANGE/PERFORMANCE PROBLEM (HIGH
INPUT)—
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
Erroneous idling
Engine stalls.
Poor driving performance
WIRING DIAGRAM:
B2M1057
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
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Page 2212 of 3342
10CH1CHECK DTC P0102 OR P0103 ON DIS-
PLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0102 or
P0103?
: Inspect DTC P0102 or P0103 using“10. Diagnos-
tics Chart with Trouble Code”.
[T10A0].>
NOTE:
In this case, it is not necessary to inspect DTC P1141.
: Replace mass air flow sensor.
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Page 2213 of 3342
B2M1127
CI: DTC P1142
—THROTTLE POSITION SENSOR CIRCUIT
RANGE/PERFORMANCE PROBLEM (LOW
INPUT)—
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
Erroneous idling
Engine stalls.
Poor driving performance
WIRING DIAGRAM:
B2M0540
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
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10. Diagnostic Chart with Trouble Code for LHD Vehicles
Page 2214 of 3342
10CI1CHECK DTC P0122 OR P0123 ON DIS-
PLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0122 or
P0123?
: Inspect DTC P0122 or P0123 using“10. Diagnos-
tics Chart with Trouble Code”.
[T10A0].>
NOTE:
In this case, it is not necessary to inspect DTC P1142.
: Replace throttle position sensor.
363
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10. Diagnostic Chart with Trouble Code for LHD Vehicles
Page 2215 of 3342
B2M1128
CJ: DTC P1143
—PRESSURE SENSOR CIRCUIT
RANGE/PERFORMANCE PROBLEM (LOW
INPUT)—
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
WIRING DIAGRAM:
B2M1308
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
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Page 2216 of 3342
OBD0145A
B2M0755
10CJ1
CHECK DATA FOR CONTROL.
1) Turn ignition switch to OFF.
2) Connect Subaru Select Monitor or the OBD-II general
scan tool to data link connector.
3) Turn ignition switch ON and Subaru Select Monitor or
the OBD-II general scan tool switch ON.
4) Start engine.
5) Read data on Subaru Select Monitor or the OBD-II gen-
eral scan tool.
Subaru Select Monitor
Designate mode using function key.
Function mode: F20
F20: Display shows pressure signal value sent from the
pressure sensor.
: Is the value less than 32 kPa in function
mode F20?
: Go to step10CJ3.
: Go to step10CJ2.
OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II Gen-
eral Scan Tool Instruction Manual.
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10. Diagnostic Chart with Trouble Code for LHD Vehicles