Hyundai Sonata 1991 Shop Manual page 223

EXHAUST EMISSION CONTROL SYSTEM
EXHAUST GAS RECIRCURATION SYSTEM
Y2"'08
Inspection (For Federal. Canada)
1. Disconnect the vacuum hose (green stripe) from the throttle
body, and connect a vacuum pump to the vacuum hose.
2. Check the following points when the engine is cold [coolant
temperature 50°C (122°F) or below] and when it is hot
[Coolant temperature BQ-95°C (176-205°F) or higher].
Engine coolant
Vacuum
Engine Normal
temperature
condition
condition
Cold
Apply
Idling Vacuum is
released
6 kPa Idling Vacuum is
Hot
(1.7 in.Hg) held
26 kPa Idle is
Vacuum is
(7.5 in.Hg) unstable held
Inspection (For California)
\
29Y099
1. Disconnect the vacuum hose (green stripe) from the EGR
valve, and connect a vacuum pump via the three way terminal.
2. Check the following points when the engine is cold [Coolant
temperature 20°C (6BOF) or below] and when it is hot [Coo-
lant temperature 70°C (15BOF) or higher].
When the engine is cold
Engine condition Normal condition
Press the accelerator pedal Vacuum: no change
suddely and race the engine.
(atmospheric pressure)
When the engine is warm
Engine condition Normal condition
Press the accelerator pedal
Vacuum rises temporarily
suddenly and race
the
to 14 kPa (3.9 in.Hg).
engine.
3. Disconnect the three-way terminal and connect the hand
vacuum pump directly to the exhaust gas recirculation (EGR)
valve.
4. Check whether the engine stalls or the idling is unstable
when a vacuum of 20 kPa (5.9 in.Hg) or higher is applied
during idling.
29-18