Toyota COMPUTER-CONTROLLED SYSTEM User Manual

INSPECTION AND ADJUSTMENT - Feedback Correctio n
FEEDBACK
CORRECTIO N
OBJECTIVE
: To learn how to check feedback correction .
PREPARATIONS :
• SST 09843-18020 Diagnosis check wir e
• Analog type voltmeter ( also called "circuit tester" or "multi-tester")
APPLICABLE ENGINE : 4A-FE (
Sep ., 1989 )
MODELS
W/OXYGEN SENSOR (02 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 E1 .
NOTICE : If
terminals T or TE7 and E7 are not connected,
0 V, 2 .5 V, or 5 V will be output from
the VF or VF1
terminal .
The meaning of this VF
voltage differs depending on
the engine . For fu rt
her details, see page 136 .
(c) Connect terminal T or TE1 with terminal El of the
check connector .
SST 09843-1802
0
(d) Warm up the oxygen sensor to operating
temperature by running the engine at 2,500 rpm
for about 2 minutes .
(e) While maintaining the engine speed at 2,500 rpm,
check that the needle of the voltmeter fluctuates
eight or more times in 10 seconds .
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Toyota COMPUTER-CONTROLLED SYSTEM Specifications

General

Brand	Toyota
Model	COMPUTER-CONTROLLED SYSTEM
Category	Automobile Accessories
Language	English