190D 2.5 (201.126) L5-2.5L DSL (602.911) (1987)
EGR Control Solenoid: Testing and Inspection
1.
Check voltage at switchover valve plugs with engine at 1200 ± 50 rpm. Battery voltage should be present.
2.
Connect vacuum tester with Y distributor onto switch-over valve top side nipple and check vacuum with engine operating at 1200 RPM and 12
volts applied.
a. On switch-over valve Y27, vacuum readings should be:
Manual trans..................................................................................................................................................................................................300 ± 20 mbar
Automatic trans..............................................................................................................................................................................................350 ± 20 mbar
b. On switch-over valve Y28, approx. 700 mbar (20 in. Hg) of vacuum should be obtained.
c. If vacuum obtained is correct, switch-over valve is satisfactory.
d. If vacuum obtained is incorrect, check vacuum pump and replace switch-over valve if necessary.