Двигатели Scania четвёртой серии. Руководство — часть 157

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03:04-06

Fault code D002

Fault

Internal fault in the control unit.

Cause

The control unit could not process (convert) the
signal from the fuel supply pressure sensor.

Remarks

If the fault is active, the control unit uses a pre-
programmed value (21,4 bar absolute
pressure).

Engine torque is limited by 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

03:04-06

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67

Fault code D004

Fault

The control unit does not rely on the fuel
supply pressure sensor signal even though it is
within the electrical tolerances.

Cause

The supply pressure is implausibly high in
comparison with normal pressure for different
operational conditions.

Remarks

If the voltage is outside the permitted range, the
control unit uses a pre-programmed value
(21,4 bar absolute pressure).

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

Action

Check the overflow valve.

Check the signal from the fuel feed 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

68

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03:04-06

Fault code D005

Fault

The control unit does not rely on the fuel
supply pressure sensor signal even though it is
within the electrical tolerances.

Cause

The supply pressure is implausibly low in
comparison with normal pressure for different
operational conditions.

Remarks

If the voltage is outside the permitted range, the
control unit uses a pre-programmed value
(21,4 bar absolute pressure).

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

Action

Check the signal from the fuel supply 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.

The fault may also be due to any of the
following causes:

One of the two overflow valves opens too early.

The fuel shut-off valve is closed.

The fuel filter is blocked.

Air in the fuel or out of fuel.

Defect supply pump.

Serious leakage in the fuel system.

Fault codes

03:04-06

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69

Fault code D100

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 front bank,
cylinder 1-3.

Cause

The voltage between pin 3 and 2 in connector
A1 is too high, or there is a fault with the
voltage supply to sensor group 2 (pin 8 in
connector B2, 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 rear bank, cylinder 4-6 is incorrect at the
same time, it is probably the shared voltage
supply for the sensors which is faulty.

Engine torque is limited by 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