Subaru Legacy (2005 year). Manual - part 60

ME(H4SO 2.0)-23

MECHANICAL

Idle Speed

3. Idle Speed

A: INSPECTION

1) Before checking the idle speed, check the fol-
lowing:

(1) Ensure the air cleaner element is free from
clogging, ignition timing is correct, spark plugs
are in good condition, and hoses are connected
properly.
(2) Ensure the malfunction indicator light does
not illuminate.

2) Idle the engine.
3) Stop the engine, and turn the ignition switch to
OFF.
4) When using Subaru Select Monitor, refer to the
following. <Ref. to ME(H4SO 2.0)-13, SPECIAL
TOOL, PREPARATION TOOL, General Descrip-
tion.>

(1) Insert the cartridge to Subaru Select Moni-
tor.
(2) Connect the Subaru Select Monitor to data
link connector.

(3) Turn the ignition switch to ON and the Sub-
aru Select Monitor power switch to ON.
(4) Select {Each System Check} in Main Menu.
(5) Select {Engine} in Selection Menu.
(6) Select {Current Data Display & Save} in En-
gine Control System Diagnosis.
(7) Select {Data Display} in Data Display Menu.
(8) Start the engine, and read the engine idle
speed.

5) When using the tachometer (Secondary pick-up
type):

(1) Attach the pick-up clip to No. 1 cylinder
spark plug cord.

(2) Start the engine, and read the engine idle
speed.

NOTE:
This ignition system provides simultaneous ignition
for #1 and #2 plugs. It must be noted that some ta-
chometers may register twice that of actual engine
speed. 
6) Check the idle speed when no-loaded. (Head-
light, heater fan, rear defroster, radiator fan, A/C,
etc. are OFF.)

Idle speed [No load and gears in “N” or “P” 
range]:

650

±

100 rpm

7) Check the idle speed when loaded. (Turn the A/
C switch to “ON” and operate the compressor for at
least one minute before measurement.)

Idle speed [A/C “ON” and gears in “N” or “P” 
range]:

800

±

100 rpm

NOTE:
Idle speed cannot be adjusted manually, because
idle speed is automatically adjusted. If the idle
speed is out of specifications, refer to General Di-
agnostic Table under “Engine Control System”.
<Ref. to EN(H4SO 2.0)(diag)-2, Basic Diagnostic
Procedure.>

(1) Data link connector

AT-01712

(1)

ME-00811

ME(H4SO 2.0)-24

MECHANICAL

Ignition Timing

4. Ignition Timing

A: INSPECTION

CAUTION:
After warming-up, engine becomes very hot. Be 
careful not to burn yourself at measurement.
1) Idle the engine.
2) To check the ignition timing, connect a timing
light to #1 cylinder spark plug cord, and illuminate
the timing mark with the timing light.
3) Start the engine and check the ignition timing at
the following idle speed.

Ignition timing [BTDC/rpm]:

13

°±

10

°

/650

If the timing is not correct, check the ignition control
system. <Ref. to EN(H4SO 2.0)(diag)-2, Basic Di-
agnostic Procedure.>

ME-00812

20

10

ME(H4SO 2.0)-25

MECHANICAL

Intake Manifold Vacuum

5. Intake Manifold Vacuum

A: INSPECTION

1) Idle the engine.
2) Disconnect the brake vacuum hose from the in-
take manifold, and then install the vacuum gauge.
3) Keep the engine at idle speed and read the vac-
uum gauge indication.
By observing the gauge needle movement, the in-
ternal condition of the engine can be diagnosed
with the following procedures.

Vacuum pressure (at idling, A/C “OFF”):

Less than 

−

60.0 kPa (

−

450 mmHg, 

−

17.72 in-

Hg)

ME-00813

Diagnosis of engine condition by measurement of intake manifold vacuum

Vacuum gauge indication

Possible engine condition

1. Needle is steady but lower than normal position. This ten-
dency becomes more evident as engine temperature rises.

Air leakage around intake manifold gasket, disconnection or 
damage of vacuum hose

2. Needle intermittently drops to position lower than normal 
position.

Leakage around cylinder

3. Needle drops suddenly and intermittently from normal posi-
tion.

Valve anchoring

4. When engine speed is gradually increased, needle begins to 
vibrate rapidly at certain speed, and then vibration increases as 
engine speed increases.

Weak or broken valve spring

5. Needle vibrates above and below normal position in narrow 
range.

Defective ignition system

ME(H4SO 2.0)-26

MECHANICAL

Engine Oil Pressure

6. Engine Oil Pressure

A: INSPECTION

1) Disconnect the ground cable from battery.

2) Remove the generator from bracket. <Ref. to
SC(H4SO 2.0)-14, REMOVAL, Generator.>
3) Disconnect the connector from pressure switch.
4) Remove the pressure switch from cylinder block.
<Ref. to LU(H4SO 2.0)-18, REMOVAL, Oil Pres-
sure Switch.>
5) Connect the oil pressure gauge hose to cylinder
block.
6) Connect the ground cable to battery.

7) Start the engine, and measure the oil pressure.

Oil pressure:

Standard (at 600 rpm)

98 kPa (1.0 kgf/cm

2

, 14 psi) or more

Standard (at 5,000 rpm)

294 kPa (3.0 kgf/cm

2

, 43 psi) or more

CAUTION:
• If the oil pressure is out of standard, check oil
pump, oil filter and lubrication line. <Ref. to
LU(H4SO 2.0)-20, INSPECTION, Engine Lubri-
cation System Trouble in General.>
• If the oil pressure warning light comes on
though the oil pressure is within standard, re-
place the oil pressure switch. <Ref. to LU(H4SO
2.0)-20, INSPECTION, Engine Lubrication Sys-
tem Trouble in General.>

NOTE:
The standard is based on an engine oil tempera-
ture of 80

°C (176°F).

8) After measuring the oil pressure, install the oil
pressure switch. <Ref. to LU(H4SO 2.0)-18, IN-
STALLATION, Oil Pressure Switch.>

Tightening torque:

25 N

⋅

m (2.5 kgf-m, 18.4 ft-lb)

IN-00203

IN-00203

ME-00196