300SD (140.134) L6-3.5L DSL Turbo (603.971) (1993)
Schematic - Vacuum Valve Block
Image Reference:
a: "Air Conditioning" non-return valve
b: "Intake manifold vacuum" non-return valve
c: "Transmission" non-return valve
Connection Diagram - Vacuum Valve Block
No.
Color
From/To
1
medium green/yellow
Footwell air conditioner
2
light blue
Seat backrest lock
3
violet
Headlamp range adjustment switch (input)
4
violet-yellow
Headlamp range adjustment element (left)
5
grey-green
Valve block (Y11)
6
white (transparent)
Intake manifold vacuum assist
7
grey
Intake manifold vacuum
8
Connection not assigned
9
violet-yellow
Headlamp range adjustment switch (output)
10
violet-yellow
Headlamp range adjustment element (right)
11
black-grey
2nd selection program automatic transmission (system)
12
black-grey
2nd selection program automatic transmission (reservoir)
13
red-grey
Air conditioner reservoir
CHECKING VACUUM VALVE BLOCK (36):
Vacuum Valve Block (36)
1. Expose vacuum valve block (36) by removing foot support (front passenger's side).
2. Disconnect grey cable (connection 7) and seal at intake manifold with blind plug. Connect tester and check for leaks.
Vacuum Valve Block
3. Disconnect all cables. Seal connections 5 and 13 with blind plugs, connect tester to connection 6 with adapter and evacuate. If a pressure rise
occurs on the pressure gauge, renew vacuum valve block (36).
NOTE: If not fault been found, check non-return valves a, b and c in vacuum valve block (36).