Daihatsu F300 Service Manual page 1350

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(4) Heat the TVSV more than 30°C, and check that air flows
from pipe M to pipe K.
THROTTLE POSITIONER (TP) SYSTEM
Operation
For the purpose of reducing the CO and HC emissions, the
throttle positioner prevents the throttle valve from being closed
suddenly during the engine braking period, utilizing a negative
pressure generated in the intake manifold .
Inspection of throttle positioner system
1. Warm up the engine.
2. Disconnect the vacuum hose from the throttle positioner.
Plug the hole, using the following SST.
SST: 09258-00030..000
NOTE:
• At this time, be sure that the throttle positioner shaft is
stretched fully.
3. Check that touch revolution speed is set.
Touch Revolution Speed: 1500 ±50 rpm
4. It not at specified speed adjust with throttle positioner ad-
justing screw.
5. Hold the engine revolution speed at about 2500 rpm at least
five seconds by opening the throttle valve. Then, release
the throttle lever. Check that the time required for the engine
revolution speed to drop from 1500 to 1200 rpm conforms
to the specified value.
Specified Time: 0.5- 5 seconds
If the time will not conform to the specification, check the
direction of the VTV. Then, proceed to check the VTV.
EC-11
EMISSION CONTROL SYSTEM
More than 30°C
A
J
L M
I
\--• ;
K
-------
Throttle
vrv
To Distributor
Diaphragm
WFE9Q.EC037