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Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 38

FU(STI)-64

Electronic Throttle Control Relay

FUEL INJECTION (FUEL SYSTEMS)

22.Electronic Throttle Control

Relay

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove the electronic throttle control relay from

the relay block on the back side of the glove box.

B: INSTALLATION

Install in the reverse order of removal.

C: INSPECTION

1) Check that the electronic throttle control relay

has no deformation, cracks or other damages.

2) Measure the resistance between electronic

throttle control relay terminals.

IN-00203

FU-03420

Terminal No.

Standard

1 and 2

1 MΩ or more

3 and 4

93.8 — 136.4 Ω

(when 20°C (68°F))

1
2

3 4

(1)

(2)

(1)

(4)

(2)

(3)

(4)

IN-02836

FU(STI)-65

Electronic Throttle Control Relay

FUEL INJECTION (FUEL SYSTEMS)

3) Connect battery positive terminal to terminal No.

3 and battery ground terminal to terminal No. 4, and

measure the resistance between the electronic

throttle control relay terminals.

Terminal No.

Standard

1 and 2

Less than 1 Ω

FU-04077

1
2

3 4

(1)

(2)

(1)

(4)

(2)

(3)

(4)

FU(STI)-66

Fuel Pump Control Unit

FUEL INJECTION (FUEL SYSTEMS)

23.Fuel Pump Control Unit

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove the right side trunk side trim. (4 door

model) <Ref. to EI-63, REMOVAL, Trunk Room

Trim.>

3) Remove the right side rear quarter trim. (5 door

model) <Ref. to EI-60, REMOVAL, Rear Quarter

Trim.>

4) Disconnect the connector (A) from the fuel pump

control unit, and remove the fuel pump control unit.

• 4 door model

• 5 door model

B: INSTALLATION

Install in the reverse order of removal.
Tightening torque:

5 N·m (0.5 kgf-m, 3.7 ft-lb)

C: INSPECTION

Check that the fuel pump control unit has no defor-

mation, cracks or other damages.

IN-00203

FU-05753

(A)

FU-05754

(A)

FU(STI)-67

Fuel

FUEL INJECTION (FUEL SYSTEMS)

24.Fuel

A: PROCEDURE

1. RELEASING OF FUEL PRESSURE

WARNING:

Place “NO OPEN FLAMES” signs near the

working area.
CAUTION:

Be careful not to spill fuel.

1) Remove the fuse of fuel pump from main fuse

box.

2) Start the engine and run it until it stalls.

3) After the engine stalls, crank it for five more sec-

onds.

4) Turn the ignition switch to OFF.

5) Install the fuse of fuel pump to the main fuse box.

2. DRAINING FUEL (WITH SUBARU SE-

LECT MONITOR)

WARNING:

Place “NO OPEN FLAMES” signs near the

working area.
CAUTION:

Be careful not to spill fuel.
NOTE:

• If the fuel pump cannot be driven, refer to the

procedures for draining from the fuel filler hose.

(THROUGH THE FUEL FILLER HOSE), PROCE-

DURE, Fuel.>

• Be careful not to let the battery run-out.

• Be aware that the fuel may remain in the fuel

tank after draining the fuel.

1) Release the fuel pressure. <Ref. to FU(STI)-67,

RELEASING OF FUEL PRESSURE, PROCE-

DURE, Fuel.>

2) Attach ST to the fuel delivery pipe and push ST

in the direction of arrow mark to disconnect the fuel

delivery hose.

ST 42099AE000 QUICK CONNECTOR RE-

LEASE

CAUTION:

• Be careful not to spill fuel.

• Catch the fuel from hoses using a container

or cloth.

3) Connect ST to the fuel delivery hose.

ST 18471AA000 FUEL PIPE ADAPTER

4) Connect the gasoline proof hose to ST and put

the end of the hose in the container.

5) Drive the fuel pump and drain the fuel using Sub-

aru Select Monitor. <Ref. to EN(H4DOTC)(diag)-

65, FUEL PUMP CONTROL (ON/OFF DRIVE),

OPERATION, System Operation Check Mode.>
CAUTION:

Be careful not to spill fuel.

6) Install the related parts in the reverse order after

draining the fuel.

FU-01122

(A) Fuel delivery hose
(B) Fuel return hose

ME-05008

(A)

(B)

(C)

Content .. 36 37 38 39 ..