0500 - E. Vacuum Circuit Diagrams Engine 603.96 in Model 124 (USA) Federal/Calif. from MY 1987 Engine 603.96 in Model 126 Calif. from MY 1987

Y31/1

Vacuum transducer, exhaust gas recirculation valve

a

Ventilation to passenger compartment

b

Key shut-off

c

Other ancillaries

d

Vacuum unit, automatic transmission

e

Key shut-off

f

Brake booster

Pressure and vacuum connections to vacuum transducer or vacuum amplifier

PRE

Charge pressure from ALDA unit

TRA

To vacuum unit, automatic transmission

VAC

Vacuum from vacuum pump

VCV

To vacuum control valve

ATM

Ventilation to passenger compartment

ARF

Exhaust gas recirculation to exhaust gas recirculation valve or recirculating air valve

sw

black

bl

blue

be

brown

gr

grey

vi

violet

rt

red

ws

white

1

Injection pump

2

Governor

6

Stop unit

60

Exhaust gas recirculation valve

61a

Restriction, blue

61b

Restriction, orange

61c

Restriction

61d

Restriction

62

Filter

62a

Filter

62c

Ventilation filter

65

Vacuum control unit

67

Vacuum pump

72

Damper

103

ALDA unit

123

Vacuum amplifier

137

Exhaust gas turbocharger

137b

Recirculating air valve

138

Charge air distribution pipe

140

Non-return valve - brake booster

Y22

ELR actuator

Y29

Vacuum amplifier switchover valve, automatic transmission

Y30

Switchover valve, engine overload protection

Y31

Vacuum transducer, recirculating air valve