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1.Disconnect the vacuum hose
(Black) from the exhaust gas recirculation valve, and then
connect a hand vacuum pump via the three-way
terminal.
2.When the engine is hot or cold, check
the condition of vacuum by racing the engine.
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When engine is
cold
(Engine coolant temperature:
20°C or less)
Throttle
valve
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Normal vacuum
condition
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Open quickly
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No vacuum will
generate (the same as barometric
pressure.)
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When engine is
hot
(Engine coolant temperature:
80°C or higher)
Throttle
valve
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Normal vacuum
condition
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Open quickly
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It will momentarily
rise over 13 kPa
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3.Disconnect the three-way terminal and hand
vacuum pump.
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4.Connect the hand vacuum
pump to the exhaust gas recirculation valve
nipple.
5.Check whether the engine stalls or the
idling is unstable when a vacuum of 29 kPa
or higher is applied during idling.
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