Models With Lean Mixture Sensor - Toyota COMPUTER-CONTROLLED SYSTEM Training Manual

INSPECTION AND ADJUSTMENT - Feedback Correctio n
MODELS W/LEAN MIXTURE SENSOR
CHECKING FEEDBACK CORRECTIO N
(a) Warm up the engine to 80°C (176°F) .
(b) Connect a voltmeter to check connector terminals
VF or VF1 and El .
(c) Connect terminal T or TE1 with terminal El of the
check connector.
SST 09843-1802 0
(d) Warm up the lean mixture sensor to operating
temperature by running the engine at idle for at
least 10 minutes .
(e) To start feedback correction, race the engine at
3,500 rpm, then repeat 20 seconds later .
(f) While the maintaining engine speed at 1,500 rpm,
check the VF terminal voltage .
0 V : Air-fuel ratio feedback correction is
taking plac e
2 .5 V or 5 V : Air-fuel ratio feedback correction is
not taking place
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