Page 2023 of 2890
H2M1372
AK: DTC P0450
—EVAPORATIVE EMISSION CONTROL
SYSTEM PRESSURE SENSOR
MALFUNCTION (TNKP)—
DTC DETECTING CONDITION:
Immediately at fault recognition
10AK1Connect Subaru Select Monitor or the OBD-II
general scan tool, and read data.
10AK2Check input signal for ECM. (Using voltage
meter and Subaru Select Monitor.)
10AK3Check harness between ECM and fuel tank
pressure sensor connector.
10AK4Check harness between ECM and fuel tank
pressure sensor connector.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
255
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 2032 of 2890
H2M1377
AL: DTC P0451
—EVAPORATIVE EMISSION CONTROL
SYSTEM PRESSURE SENSOR
RANGE/PERFORMANCE PROBLEM
(TNKP
—F)—
DTC DETECTING CONDITION:
Two consecutive trips with fault
10AL1Check pressure/vacuum line.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
WIRING DIAGRAM:
LHD Model
B2M0926
264
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 2034 of 2890
OBD0340
AM: DTC P0500
—VEHICLE SPEED SENSOR MALFUNCTION
(VSP)—
DTC DETECTING CONDITION:
Immediately at fault recognition
10AM1Check speedometer operation in combination
meter.
10AM2Check harness between ECM and combination
meter connector.
10AM3Check harness between ECM and combination
meter connector.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
WIRING DIAGRAM:
LHD Model
B2M0572
266
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 2037 of 2890
OBD0358
AN: DTC P0505
—IDLE CONTROL SYSTEM MALFUNCTION
(ISC)—
DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
Erroneous idling
Engine stalls.
Engine breathing
10AN1Check air intake system.
10AN2Check output signal from ECM.
10AN3Check idle air control solenoid valve.
10AN4Check power supply to idle air control
solenoid valve.
10AN5Check harness between ECM and idle air
control solenoid valve connector.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
269
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 2044 of 2890
OBD0370
AO: DTC P0506
—IDLE CONTROL SYSTEM RPM LOWER
THAN EXPECTED (ISC
—L)—
DTC DETECTING CONDITION:
Two consecutive trips with fault
TROUBLE SYMPTOM:
Engine is difficult to start.
Engine does not start.
Erroneous idling
Engine stalls.
10AO1Check DTC P0505 on display.
10AO2Check air intake system.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
10AO1
CHECK DTC P0505 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0505?
: Inspect DTC P0505 using“10. Diagnostics Chart
with Trouble Code 2-7 [T1000]”.
NOTE:
In this case, it is not necessary to inspect DTC P0506.
: Go to step10AO2.
10AO2
CHECK AIR INTAKE SYSTEM.
1) Turn ignition switch to ON.
2) Start engine, and idle it.
: Is clogging the by-pass line between by-
pass hose and intake duct?
: Repair the by-pass line.
: Replace idle air control solenoid valve.
276
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 2045 of 2890
OBD0371
AP: DTC P0507
—IDLE CONTROL SYSTEM RPM HIGHER
THAN EXPECTED (ISC
—H)—
DTC DETECTING CONDITION:
Two consecutive trips with fault
TROUBLE SYMPTOM:
Engine keeps running at higher revolution than specified
idling revolution.
10AP1Check DTC P0505 on display.
10AP2Check air intake system.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
10AP1
CHECK DTC P0505 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0505?
: Inspect DTC P0505 using“10. Diagnostics Chart
with Trouble Code 2-7 [T1000]”.
NOTE:
In this case, it is not necessary to inspect DTC P0507.
: Go to step10AP2.
10AP2
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 air suction and leaks.
: Replace idle air control solenoid valve.
277
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 2046 of 2890
AQ: DTC P0600
—SERIAL COMMUNICATION LINK
MALFUNCTION—
DTC DETECTING CONDITION:
Two consecutive trips with fault
10AQ1Check harness between ECM and data link
connector.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
WIRING DIAGRAM:
LHD Model
B2M0581
278
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
Page 2049 of 2890
OBD0376
AR: DTC P0601
—INTERNAL CONTROL MODULE MEMORY
CHECK SUM ERROR (RAM)—
DTC DETECTING CONDITION:
Two consecutive trips with fault
TROUBLE SYMPTOM:
Engine does not start.
Engine stalls.
10AR1Check DTC P0601 on display.
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES.
WIRING DIAGRAM:
LHD Model
B2M0519
281
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code
