Двигатели Scania четвёртой серии. Руководство — часть 160

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03:04-06

Fault code D203

Fault

The fuel pressure to one or two cylinders on the
rear bank, cylinder 4-6, is too high.

Cause

The pressure pulse from the solenoid valve to
the injector is too long because there is an
obstruction on the flow of fuel to the injector.

The fault code can be generated if the vehicle
has not been driven for some time, especially in
cold weather, as air might have entered the
system. The fault code will be generated, either
when starting or within two minutes after
starting.

Remarks

As a result, the engine is running unevenly due
to no fuel supply to one or two cylinder.

Action

Bleed the fuel system and bring the engine to
operating temperature.

If the engine runs unevenly despite bleeding
the fuel system and bringing the engine to
operating temperature, carry out the following:

Change injectors on the rear bank, cylinder 4-6.

Clean the fuel rail (clean the ducts for injection
timing and fuel with compressed air).

Clean the fuel ducts in the cylinder heads on
the rear bank, cylinder 4-6.

If it becomes evident that the fault is due to
debris in the fuel system, check the fuel filter
and change if necessary.

Fault codes

03:04-06

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79

Fault code D204

Fault

The fuel pressure to all cylinder on the rear
bank, cylinder 4-6, is too high.

Cause

The fuel volume solenoid valve may be stuck
open.

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

Remarks

As a result, the engine speed is limited to
between 500 and 550 rpm by means of the fuel
shut-off valve. The engine runs very unevenly.

Action

Check the wiring and clean the connectors to
the solenoid valves and the pressure sensor on
the front bank, cylinder 4-6.

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

If the fault remains, first renew the fuel volume
solenoid valve and if necessary the fuel
pressure sensor.

Fault codes

80

ã

03:04-06

Fault code D205

Fault

The fuel pressure to all cylinders on the rear
bank, cylinder 4-6, is too low.

Cause

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

Serious fuel 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 rear bank, cylinder 4-6.

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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81

Fault code D300

Fault

The fuel volume solenoid valve on the front
bank, cylinder 1-3 is faulty.

Cause

Shorted to +24 V alternatively between pin 1
and 2 on connector B2.

Remarks

As a result, the engine runs very unevenly.

Action

Check the wiring and clean the connectors.

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

If the fault remains, renew the fuel volume
solenoid valve.

Fault code D301

Fault

The fuel volume solenoid valve on the front
bank, cylinder 1-3 is faulty.

Cause

Pin 1 and 2 on connector B2 shorted to earth.

Remarks

As a result, the engine runs very unevenly.

Action

Check the wiring and clean the connectors.

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

If the fault remains, renew the fuel volume
solenoid valve.

Fault codes