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No.
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TECH
1-DISPLAY
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Conditions
for Checking
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Nominal
Value
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Trouble
Codes
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Terminal
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05
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BOOST PRESSURE
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Ignition ON
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approx. 1.0 bar 1.8 V
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41, 42, 43, 44
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51, 54, 13
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Engine running at idle speed, operating temperature
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approx. 1.0 bar 1.8 V
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Actuate accelerator pedal several times
(engine speed 3000 rpm)
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greater than 1.2 bar
2.0 V
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Fully depress accelerator pedal briefly
(bypass valve fully open)
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greater than 1.4 bar
greater than 2.1 V
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Note:
If TECH 1 displays values for the above test
steps which behave analogously to the prescribed nominal values but do not
attain the required magnitude, the system should first be checked for the
following mechanical faults:
· Check electro-pneumatic pressure converter,
bypass valve adjuster, bypass valve and corresponding pneumatic lines for
correct functioning (see Service Instructions)
· Check turbocharger (see Service Instructions)
· Check intake system for leaks
· Check charge air hoses for leaks (secondary air,
porosity and blockages)
If no mechanical fault or no reaction is determined
on TECH 1, start the following trouble-shooting.
Important:
If the system is in emergency operation (trouble
codes 41,42 or 43 stored), the control unit provides replacement values for
the charge pressure and the atmospheric pressure (cf. section 5.5 "Table
2, Digital Diesel Electronics DDE 2.1 F2:TROUBLE CODE TABLE").
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Trouble-shooting
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Nominal Value
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Cause of
Fault:
(If nominal
value is not attained)
|
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· Ignition ON
· Disconnect wiring harness plug from charge
pressure sensor P65
· TECH 1 parameter BOOST PRESSURE
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lower than 0.1 V
|
· Short circuit to voltage
from: wiring
harness plug for DDE control unit K70 Ter. 54
to: wiring
harness plug for charge pressure sensor P65 Ter. 1
· DDE control unit K70 defective
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· Using multimeter, measure voltage
from: wiring
harness plug for charge pressure sensor P65 Ter. 3
to: ground
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4.5 to 5.5 V
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Voltage lower than 4.5 V:
· Short circuit to ground/ circuit interruption
from: wiring
harness plug for DDE control unit K70 Ter. 51
to: wiring
harness plug for charge pressure sensor P65 Ter. 3
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Voltage greater than 5.5 V:
· Short circuit to voltage
from: wiring
harness plug for DDE control unit K70 Ter. 51
to: wiring
harness plug for charge pressure sensor P65 Ter. 3
· DDE control unit K70 defective
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· Bridge wiring harness plug for charge pressure
sensor P65 with electrically fused jumper
from: wiring
harness plug for charge pressure sensor P65 Ter. 3
to: wiring
harness plug for charge pressure sensor P65 Ter. 1
· TECH 1 parameter BOOST PRESSURE
|
4.5 to 5.5 V
|
· Short circuit to ground/ circuit interruption
from: wiring
harness plug for DDE control unit K70 Ter. 54
to: wiring
harness plug for charge pressure sensor P65 Ter. 1
· DDE control unit K70 defective
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· Using multimeter, measure voltage
from: wiring
harness plug for charge pressure sensor P65 Ter. 3
to: wiring
harness plug for charge pressure sensor P65 Ter. 2
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4.5 to 5.5 V
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· Circuit interruption
from: wiring
harness plug for DDE control unit K70 Ter. 13
to: wiring
harness plug for charge pressure sensor P65 Ter. 2
· DDE control unit K70 defective
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If nominal values are attained
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· Charge pressure sensor P65 defective
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