Idle Speed And Idle Mixture - Toyota COMPUTER-CONTROLLED SYSTEM Training Manual

INSPECTION AND ADJUSTMENT - Idle Speed and Idle Mixture
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 set
(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 .
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