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10.
INSPECT CO/HC
(a)
Start the engine.
(b)
Race engine at 2,500 r/min for approx. 180 seconds.
(c)
Insert CO/HC meter testing probe at least 40 cm (1.3 ft) into tailpipe during idling.
(d)
Immediately check CO/HC concentration at idle and/or 2,500 r/min.
HINT:
S
Complete the measuring within 3 minutes.
S
When doing the 2 mode (idle and 2,500 r/min.) test, these measuring orders are prescribed by the ap-
plicable local regulations.
(e)
If the CO/HC concentration does not comply with regulations, troubleshoot in the order given below.
(1)
Check heated oxygen sensor operation. (See page 12–1)
(2)
See the table below for possible causes, and then inspect and correct the applicable causes if
necessary.
2002 CAMRY REPAIR MANUAL (RM881U)
ENGINE MECHANICAL
–
(3)
Compression pressure:
1.360 MPa (13.9 kgf/cm
Minimum pressure:
0.98 MPa (10 kgf/cm
Difference between each cylinder:
100 kPa (1.0 kgf/cm
NOTICE:
S
Always use a fully charged battery to obtain engine
speed of 250 rpm or more.
S
Check other cylinder's compression pressure in the
same way.
S
This measurement must be done in as short a time as
possible.
(4)
HINT:
S
If adding oil increases the compression, it is likely that the
piston rings and/or cylinder bore are worn or damaged.
S
If pressure stays low, a valve may be sticking or seating
improperly, or there may be leakage past the gasket.
ENGINE ASSEMBLY (2AZ–FE)
While cranking the engine, measure the compres-
sion pressure.
2
, 198 psi)
2
, 142 psi)
2
, 14 psi)
If the cylinder compression is low, pour a small
amount of engine oil into the cylinder through the
spark plug hole and inspect again.
Author :
14–3
Date :
1525
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