Circuit description
The engine is equipped with a turbocharger with a
wastegate valve. The wastegate valve controls the
amount
of
exhaust gas flow which should pass through
the exhaust turbine. An electronically controlled regu-
lation valve, wastegate regulator, which is controlled
by the engine control unit controls the air pressure
supplied to the wastegate valve. Air pressure taken
from the inlet manifold is used to control the amount
that the wastegate opens. As the air pressure supplied
by the control valve to the wastegate valve increases,
the valve opens wider. When the wastegate valve is
fully open, the exhaust gas flow to the exhaust turbine
is at its lowest.
The control valve is current controlled by the engine
control valve, using a PWM signal. As the current sup-
plied to the control valve increases, the boost air pres-
sure increases. The boost air pressure is constantly
monitored by a sensor installed in the inlet manifold.
Measurements
Checking negative cable, wastegate valve page 181
Checking supply cable, wastegate valve page 182
Checking the wastegate valve page 183
2
1
7
EMS2
A
B
GN
SB
C
R / BL
38
(+)57,60
(-)58,59
P0013529
TWD1643GE, TWD1663GE, TWG1663GE
A Connector B
B
Junction points
C Wastegate
b
a
EMS
2
1
38
GN
R / BL
R / BL
(+) 57
(+) 60
P0007253
TAD1340-1345VE, TAD1350VE, TAD1341-1345GE,
TAD1350-55GE
a Wastegate
b
Connector B
30-2 Fault Tracing
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