Двигатели Scania четвёртой серии. Руководство - часть 164

94

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03:04-06

Fault code D701

Fault

Short circuit in the fuel shut-off valve.

Cause

The control unit has tried to control the voltage 
to the fuel shut-off valve without any success. 
This may be caused by a short circuit in the fuel 
shut-off valve or that pin 4 in connector B2 is 
shorted to earth.

Remarks

The fuel shut-off valve will be shut off and the 
engine will stall.

Action

Check the wiring and the fuel shut-off valve.

Fault codes

03:04-06

ã

95

Fault code D706

Fault

The fuel shut-off valve is stuck open.

Cause

The supply pressure does not decrease fast 
enough when the engine is shut down with the 
fuel shut-off valve.

Remarks

When the engine is switched off using the key, 
the fuel volume and injection timing solenoid 
valves will try to keep the engine running while 
the fuel shut-off valve signals to shut the engine 
down.

If this fails, e.g. the supply pressure does not 
decrease significantly, a fault code is generated 
and the fuel volume and injection timing 
solenoid valves will shut the engine down.

As the fault code is generated when the engine 
is shut down, it will only be cleared once the 
engine has been shut down successfully.

As a result, the engine torque is reduced by 
30%.

Action

Also check if fault code D700 or D701 has 
been generated. If fault code D700 or D701 has 
been generated, there is probably an electrical 
fault which should be rectified first.

If fault code D700 or D701 has not been 
generated, first renew the fuel shut-off valve 
and if necessary the fuel supply pressure 
sensor.

Start and stop the engine, switch the power on 
using the key and clear the fault code. Start and 
stop the engine again and check that the fault 
code has been cleared.

Fault codes

96

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03:04-06

Fault code D800

Fault

Internal fault in the control unit.

Cause

Fault in the driver stage to the fuel volume 
solenoid valve for the front bank, cylinder 1-3.

Remarks

As a result, the engine will probably run 
unevenly.

Action

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

Check if the fault code has been generated 
again. If the fault code has been regenerated, 
renew the control unit.

Fault code D801

Fault

Internal fault in the control unit.

Cause

Fault in the driver stage to the fuel volume 
solenoid valve for the rear bank, cylinder 4-6.

Remarks

As a result, the engine will probably run 
unevenly.

Action

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

Check if the fault code has been generated 
again. If the fault code has been regenerated, 
renew the control unit.

Fault codes

03:04-06

ã

97

Fault code D802

Fault

Internal fault in the control unit.

Cause

Fault in the driver stage to the injection timing 
solenoid valve for the front bank, cylinder 1-3.

Remarks

As a result, cylinder 1-3 shuts down.

Action

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

Check if the fault code has been generated 
again. If the fault code has been regenerated, 
renew the control unit.

Fault code D803

Fault

Internal fault in the control unit.

Cause

Fault in the driver stage to the injection timing 
solenoid valve for the rear bank, cylinder 4-6.

Remarks

As a result, cylinder 4-6 shuts down.

Action

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

Check if the fault code has been generated 
again. If the fault code has been regenerated, 
renew the control unit.

Fault codes