Двигатели Scania четвёртой серии. Руководство - часть 159

74

ã

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

ã

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

ã

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