I Dle Hc/Co Concentration Check Method - Toyota 3F-E Repair Manual Supplement

ENGINE MECHANICAL — Idle HC/CO Concentration Check Method
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.
EM-13