1997 SUBARU LEGACY Service Repair Manual

Page 2041 of 3342

SUBARU LEGACY 1997  Service Repair Manual OBD0240
T: DTC P0170
—FUEL TRIM MALFUNCTION—
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
Erroneous idling
Engine stalls.
Poor driving performance
CAUTIO

Page 2042 of 3342

SUBARU LEGACY 1997  Service Repair Manual B2M0047
(2) Disconnect connector from fuel tank.
(3) Start the engine, and run it until it stalls.
(4) After stopping the engine, crank the engine for 5 to
7 seconds to reduce fuel pressure.
(5) Turn

Page 2043 of 3342

SUBARU LEGACY 1997  Service Repair Manual 6) After connecting pressure regulator vacuum hose, mea-
sure fuel pressure.
: Is fuel pressure between 157 and 206 kPa
(1.6—2.1 kg/cm2,23—30 psi)?
: Go to step10T4.
: Repair the following items.

Page 2044 of 3342

SUBARU LEGACY 1997  Service Repair Manual B2M0479
4) Read data on Subaru Select Monitor or the OBD-II gen-
eral scan tool.
Subaru Select Monitor
Designate mode using function key.
Function mode: F04
F04: Water temperature is indicated in“

Page 2045 of 3342

SUBARU LEGACY 1997  Service Repair Manual B2M0481
7) Read data on Subaru Select Monitor or OBD-II general
scan tool.
Subaru Select Monitor
Designate mode using function key.
Function mode: F06
F06: Mass air flow and voltage input from mass

Page 2046 of 3342

SUBARU LEGACY 1997  Service Repair Manual H2M1350
U: DTC P0181
—FUEL TEMPERATURE SENSOR A CIRCUIT
RANGE/PERFORMANCE PROBLEM—
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
WIRING DIAGRAM:
B2M0916
CAUTION:
After repair

Page 2047 of 3342

SUBARU LEGACY 1997  Service Repair Manual 10U1CHECK DTC P0182 OR P0183 ON DIS-
PLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0182 or
P0183?
: Inspect DTC P0182 or P0183 using“10. Diagnos-
tics Chart with T

Page 2048 of 3342

SUBARU LEGACY 1997  Service Repair Manual B2M1079
V: DTC P0182
—FUEL TEMPERATURE SENSOR A CIRCUIT
LOW INPUT—
DTC DETECTING CONDITION:
Immediately at fault recognition
WIRING DIAGRAM:
B2M0916
CAUTION:
After repair or replacement of faulty