Idle Speed - Subaru Legacy 2003 Service Manual

MECHANICAL

3. Idle Speed

A: INSPECTION
1) Before checking idle speed, check the following:
(1) Ensure the air cleaner element is free from
clogging, ignition timing is correct, spark plugs
are in good condition, and the hoses are con-
nected properly.
(2) Ensure that malfunction indicator light
(CHECK ENGINE light) does not illuminate.
2) Warm-up the engine.
3) Stop the engine, and then turn the igintion switch
to OFF.
4) When using the SUBARU SELECT MONITOR
<Ref. to ME(H4SO)-15, SPECIAL TOOLS, PREP-
ARATION TOOL, General Description.>
(1) Insert the cartridge to SUBARU SELECT
MONITOR.
(2) Connect the SUBARU SELECT MONITOR
to data link connector.
(3) Turn the ignition switch to ON, and SUBA-
RU SELECT MONITOR switch to ON.
(4) Select the {2. Each System Check} in Main
Menu.
(5) Select the {Engine Control System} in Se-
lection Menu.
(6) Select the {1. Current Data Display & Save}
in Engine Control System Diagnosis.
(7) Select the {1.12 Data Display} in Data Dis-
play Menu.
(8) Start the engine, and then read the engine
idle speed.
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 then read the engine
idle speed.
NOTE:
• When using the OBD-II general scan tool, care-
fully read its operation manual.
• This ignition system provides simultaneous igni-
tion for #1 and #2 plugs. It must be noted that some
tachometers may register twice that of actual en-
gine speed.
6) Check the idle speed when unloaded. (With
headlights, heater fan, rear defroster, radiator fan,
air conditioning, etc. OFF)
Idle speed [No load and gears in neutral (MT ve-
hicles), or N or P (AT vehicles) position]:
ME-00419
7) Check the idle speed when loaded. (Turn the air
conditioning switch to "ON" and operate the com-
pressor for at least 1 minute before measurement.)
Idle speed [A/C "ON", no load and gears in neu-
tral (MT vehicles) or N or P (AT vehicles) posi-
tion]:
NOTE:
Idle speed cannot be adjusted manually, because
the idle speed is automatically adjusted.
If the specified idle speed cannot be maintained,
refer to General On-board Diagnosis Table under
"Engine Control System". <Ref. to EN(H4SO)-2,
Basic Diagnostic Procedure.>
ME(H4SO)-24
650 ± ± ± ± 100 rpm
850 ± ± ± ± 100 rpm
ME-00193