Subaru Legacy (2005 year). Manual - part 252

FU(H4DOTC)-33

FUEL INJECTION (FUEL SYSTEMS)

Rear Oxygen Sensor

15.Rear Oxygen Sensor

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Lift-up the vehicle.
3) Disconnect the connector from rear oxygen sen-
sor.
4) Apply spray-type lubricant to the threaded por-
tion of rear oxygen sensor, and leave it for one
minute or more.
5) Remove the rear oxygen sensor.

CAUTION:
When removing the rear oxygen sensor, wait 
until exhaust pipe cools, otherwise it will dam-
age exhaust pipe.

B: INSTALLATION

1) Before installing the rear oxygen sensor, apply
anti-seize compound only to the threaded portion of
the rear oxygen sensor to make the next removal
easier.

Anti-seize compound:

SS-30 JET LUBE

CAUTION:
Never apply anti-seize compound to protector 
of rear oxygen sensor.
2) Install the rear oxygen sensor.

Tightening torque:

21 N

⋅

m (2.1 kgf-m, 15.2 ft-lb)

3) Connect the connector to rear oxygen sensor.
4) Lower the vehicle.
5) Connect the ground cable to battery.

IN-00203

FU-01194

FU-01194

IN-00203

FU(H4DOTC)-34

FUEL INJECTION (FUEL SYSTEMS)

Engine Control Module (ECM)

16.Engine Control Module (ECM)

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove the lower inner trim of passenger’s
side.
<Ref. to EI-60, REMOVAL, Lower Inner Trim.>
3) Detach the floor mat of passenger’s seat.
4) Remove the protect cover.

5) Remove the nuts (A) which hold ECM to bracket.
6) Remove the clip (B) from bracket.

7) Disconnect the ECM connectors, and take out
the ECM.

B: INSTALLATION

Install in the reverse order of removal.

CAUTION:
• When replacing the ECM, be careful not to
use the wrong spec. ECM to avoid any damage
to fuel injection system.
• When replacing the ECM, be careful not to
damage the harnesses and connectors.

Tightening torque:

5 N

⋅

m (0.5 kgf-m, 3.7 ft-lb)

IN-00203

FU-00896

FU-00897

(A)

(A)

(B)

FU(H4DOTC)-35

FUEL INJECTION (FUEL SYSTEMS)

Main Relay

17.Main Relay

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove the glove box. <Ref. to EI-51, REMOV-
AL, Glove Box.>
3) Remove the harness cover (A).

4) Disconnect the connector from main relay.

B: INSTALLATION

Install in the reverse order of removal.

IN-00203

FU-01118

(A)

FU-01119

FU(H4DOTC)-36

FUEL INJECTION (FUEL SYSTEMS)

Fuel Pump Relay

18.Fuel Pump Relay

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove the glove box. <Ref. to EI-51, REMOV-
AL, Glove Box.>
3) Remove the harness cover (A).

4) Disconnect the connector from fuel pump relay.

B: INSTALLATION

Install in the reverse order of removal.

IN-00203

FU-01118

(A)

FU-01120