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10.
INSPECT CO/HC
(a)
Start the engine.
(b)
Run the engine at 2,500 rpm for approximately 180 seconds.
(c)
Insert CO/HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling.
(d)
Check CO/HC concentration at idle.
Idle CO concentration: 0 to 0.5 %
Idle HC concentration: Applicable local regulation
If the CO/HC concentration does not conform to specifications, perform troubleshooting in the order given
below.
Y
Check heated oxygen sensor operation.
Y
See the table below for possible causes, and then inspect and repair the applicable causes if
necessary.
AVENSIS REPAIR MANUAL (RM1018E)
ENGINE MECHANICAL
–
ENGINE (1ZZ–FE/3ZZ–FE)
(3)
While cranking the engine, measure the compres-
sion pressure.
Compression pressure
1,300 kPa (13.3 kgf cm
Minimum pressure: 1,000 kPa (10.2 kgf cm
Difference between each cylinder:
100 kPa (1.0 kgf cm
NOTICE:
Y
Always use a fully charged battery to obtain engine
speed of 250 rpm or more.
Y
Check other cylinder's compression pressure in the
same way.
Y
This measurement must be done in as short a time as
possible.
(4)
If the cylinder compression in one or more cylinders
is low, pour a small amount of engine oil into the cyl-
inder through the spark plug hole and repeat steps
(1) through (3) for the cylinders that have low com-
pression.
HINT:
Y
If adding oil helps increase the compression, the piston
rings and/or cylinder bore may be worn or damaged.
Y
If pressure stays low, a valve may be sticking or seating
improperly, or there may be leakage past the gasket.
http://vnx.su
2
, 189 psi)
2
, 14 psi)
14–3
2
, 145 psi)
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