Двигатели Scania четвёртой серии. Руководство - часть 160

 

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Двигатели Scania четвёртой серии. Руководство - часть 160

 

 

78

ã

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

ã

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

ã

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

 

 

 

 

 

 

 

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