Двигатели Scania четвёртой серии. Руководство — часть 159

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03:04-06

Fault code D105

Fault

The fuel pressure to all cylinders on the front
bank, cylinder 1-3, is too low.

Cause

The fault can be due to any of the following
factors:

Serious leakage after the fuel volume solenoid
valve.

Restriction in the fuel volume solenoid valve.

The fuel duct between the solenoid valve and
the fuel pressure sensor is blocked.

The fuel volume solenoid valve is constantly
closed.

The fuel pressure sensor signal is incorrectly
low in relation to the expectation of the control
unit considering the current engine load.

Remarks

Possible results of the fault are smoke, engine
running unevenly and poor engine output.

Action

Check the wiring and clean the connectors to
the solenoid valve and the fuel pressure sensor
on the front bank, cylinder 1-3.

Clear the fault code memory. Start the engine
and accelerate the engine to full speed.

If the fault remains, check the fuel duct, renew
the fuel volume solenoid valve, the fuel
pressure sensor or the fuel manifold.

Fault codes

03:04-06

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75

Fault code D200

Fault

The voltage has been above 4.79 V (above
20.3 bar absolute pressure), i.e. above the upper
limit for the fuel pressure to the rear bank,
cylinder 4-6.

Cause

The voltage between pin 6 and 7 in connector
A1 is too high, or there is a fault on the power
supply to sensor group 2 (pin 8 in connector B2
or pin 1 in connector A1).

Remarks

If the voltage is outside the permitted range, the
control unit uses a pre-programmed value
(0.448 bar absolute pressure).

If the value from the fuel pressure sensor for
the front bank, cylinder 1-3 is incorrect at the
same time, it is probably the shared voltage
supply for the sensors which is faulty.

Engine torque is limited by approximately 30%
as long as the fault is active.

Action

Check the signal from the fuel pressure sensor.

Check for any visible faults on the sensor and
the wiring.

Clean the connectors.

Then, erase the fault code memory and check
whether the fault code is generated again.

Fault codes

76

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03:04-06

Fault code D201

Fault

The voltage has been below 0.147 V (under-
1.2 bar absolute pressure), i.e. below the lower
limit for the fuel pressure to the rear bank,
cylinder 4-6.

Cause

The voltage between pin 6 and 7 in connector
A1 is too low, or there is a fault on the power
supply to sensor group 2 (pin 8 in connector B2
or pin 1 in connector A1).

Remarks

If the voltage is outside the permitted range, the
control unit uses a pre-programmed value
(0.448 bar absolute pressure).

If the value from the fuel pressure sensor for
the front bank, cylinder 1-3 is incorrect at the
same time, it is probably the shared voltage
supply for the sensors which is faulty.

Engine torque is limited by approximately 30%
as long as the fault is active.

Action

Check the signal from the fuel pressure sensor.

Check for any visible faults on the sensor and
the wiring.

Clean the connectors.

Then, erase the fault code memory and check
whether the fault code is generated again.

Fault codes

03:04-06

ã

77

Fault code D202

Fault

Internal fault in the control unit.

Cause

The control unit has not been able to process
(convert) the signal from the fuel pressure
sensor on the rear bank, cylinder 4-6.

Remarks

If the fault is active, the control unit uses a pre-
programmed value (0.448 bar absolute
pressure).

Engine torque is limited by approximately 30%
as long as the fault is active.

Action

Clear the fault code memory. Start the engine
and accelerate the engine to full speed.

If the fault code is regenerated, renew the
control unit.

Fault codes