Toyota 3F-E - I Dle Hc;Co Concentration Check Method

ENGINE MECHANICAL —
Idle HC/CO Concentration Check Method
EM-13
I
DLE HC/CO CONCENTRATION
CHECK METHOD
HINT: This check is used only to determine whether or
not the idle NC/CO complies with regulations.
1.
INITIAL CONDITIONS
(a)
Engine at normal operating temperature
(b)
Air cleaner installed
(c)
All pipes and hoses of air induction system con-
nected
(d)
All accessories switched OFF
(e)
All vacuum lines properly connected
HINT: All vacuum hoses for EGR systems, etc. should
be properly connected.
EFI system wiring connectors fully plugged
Ignition timing set correctly
Transmission in "N" range
Tachometer and HC / CO meter at hand and cali-
brated
2.
START ENGINE
3.
CHECK OXYGEN SENSORS OPERATION
(a)
Using a service wire, connect terminals TE1 and El
of the check connector.
(b)
Connect the positive ( + ) probe of a voltmeter to
terminal VF1 (VF2) of the check connector, and
negative (—) probe to terminals El .
(c)
Hold the engine speed at 2,500 rpm for approx. 2
minutes.
(d)
Then, maintaining engine at 2,500 rpm, count how
many times needle of voltmeter fluctuates between
0 and 5 V.
Minimum needle fluctuation:
8 times for every 10 seconds
If the fluctuation is less than minimum, check the air
induction system for leakage. If necessary, see EFI SYS-
TEM.
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