INSPECTION AND ADJUSTMENT
- Idle Speed and Idle Mixtur
e
IDLE SPEED AND IDLE MIXTUR
E
OBJECTIVE
: To learn
the procedure for inspecting and adjusting the idle speed and idle
mixture
.
PREPARATIONS
:
• SST 09843-18020 Diagnosis check wire
• Tachometer • CO meter
APPLICABLE
ENGINE
: 4A-FE (
Sep
., 1989
)
1
. INITIAL CONDITIONS
(a) Air cleaner installe
d
(b) All pipes and hoses of the air induction system
connecte
d
(c)
All
vacuum lines connecte
d
NOTE
: All vacuum hoses for the EGR system, etc
.,
should be properly connected
.
(d)
All
accessories switched of
f
(e) EFI system wiring connectors securely connected
(f) Ignition timing correctly se
t
(g) Transmission in "N" range
2
. WARM UP ENGIN
E
Allow the engine to reach its normal operating
temperature
.
3
. CONNECT TACHOMETE
R
Connect the test probe of a tachometer to the IG ~
terminal of the check connector
.
NOTICE
:
• NEVER allow the tachometer terminal to touch
ground as it could result in damage to the igniter
and/or ignition coil
.
• As some tachometers are not compatible with this
ignition system, we recommend that you confirm
the compatibility of your unit before use
.
4
. CHECK AIR VALVE OPERATION
5
. CHECK AND
ADJUST
IDLE SPEE
D
(a) Race the engine at 2,500 rpm for about 90 seconds
.
(b) Using the SST, connect terminal T or TE1 with
terminal El of the check connector
.
SST 09843-1802
0
(c) Check the idle speed
.
Idle speed
(
cooling fan
off)
:
2WD (Federal U
.S
. and Canada) 700 rpm
Others 800 rp
m
If not as specified, adjust the idle speed by turning the
idle speed adjusting screw
.
NOTE
: For Federal U
.S
. and Canada 2WD manual
transmission vehicles with the Daytime Running Light
System, the idle speed should rise to 800 rpm
.
172
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