17-28
Inspection procedures
Inspection: EGR valve lift
• While applying specified air pressure to the ports in accordance
with the table below, measure the valve lift in operating steps 1
to 8 on each valve.
• Replace the EGR valve if it does not conform to the standard
value.
O: Air applied
–: Air not applied
Inspection: EGR cooler
(1) Exhaust gas passage side
• Fit a cover over the exhaust gas outlet of the EGR cooler, and
connect a hose to the exhaust gas inlet. Then, submerge the
EGR cooler in a container of water. Make sure the coolant pas-
sage is full of water.
• Apply specified air pressure through the hose. Check that air
does not leak from any part.
• If there is any leakage, replace the EGR cooler.
(2) Coolant passage side
• Fit covers over the EGR cooler’s exhaust gas inlet, exhaust gas
outlet, and coolant outlet, and connect a hose to the coolant in-
let. Then, submerge the EGR cooler in a container of water.
• Apply specified air pressure through the hose. Check that air
does not leak from any part.
• If there is any leakage, replace the EGR cooler.
Operating step
Input port
M/V-1 M/V-2 M/V-3
1 –––
2O––
3–O–
4OO–
5––O
6O–O
7–OO
8 OOO
EGR VALVE, EGR MAGNETIC VALVE, EGR PIPE AND EGR COOLER
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