Двигатели Scania четвёртой серии. Руководство - часть 149

34

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03:04-06

Fault code 2201

Fault

The voltage has been below 0.329 V (below 
0.4 bar absolute pressure), i.e. below the lower 
limit for charge air pressure.

Cause

The voltage between pin 2 and 3 connector 
A10 is too low.

Remarks

If the voltage is outside the permitted range, the 
control unit uses a pre-programmed pressure 
value (approximately 1.7 bar absolute 
pressure).

The charge pressure sensor detects the absolute 
pressure in the intake manifold (the barometric 
pressure plus the positive pressure provided by 
the turbo).

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

In addition, the engine responds more slowly 
than normal to throttle actuation. This is 
because the smoke limiter is not operating 
correctly.

Action

Check the signal from the charge air pressure 
sensor.

Check any visible faults on the charge air 
pressure sensor, connectors and wiring.

Then, erase the fault code memory and check 
whether the fault code is generated again.

If the fault remains, check that the intake 
system is not blocked by for example ice or 
debris.

Also check that the air bellows are OK, that 
they are not squeezed together.

Fault codes

03:04-06

ã

35

Fault code 2202

Fault

Internal fault in the control unit.

Cause

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

Remarks

If the fault arises, the control unit uses a pre-
programmed pressure value (approximately 
1.7 bar absolute pressure).

The charge pressure sensor detects the absolute 
pressure in the intake manifold (the barometric 
pressure plus the positive pressure provided by 
the turbo).

The engine responds more slowly than normal 
to throttle actuation. This is because the smoke 
limiter is not operating correctly.

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

36

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03:04-06

Fault code 2203

Fault

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

Cause

The voltage from the charge air pressure sensor 
has been implausible when compared with 
other pressure sensors, or there has been an 
implausible pressure change in relation to the 
current operating conditions.

Remarks

If the pressure signal is implausible, the control 
unit uses a pre-programmed pressure value 
(approximately 1.7 bar absolute pressure).

The charge pressure sensor detects the absolute 
pressure in the intake manifold (the barometric 
pressure plus the positive pressure provided by 
the turbo).

The engine responds more slowly than normal 
to throttle actuation. This is because the smoke 
limiter is not operating correctly.

Action

Check the signal from the charge air pressure 
sensor.

Check any visible faults on the charge air 
pressure sensor, connectors and wiring.

Then, erase the fault code memory and check 
whether the fault code is generated again.

If the fault remains, check that the intake 
system is not blocked by for example ice or 
debris.

Also check that the air bellows are OK, that 
they are not squeezed together.

The fault code can also be generated if the 
intake system is not sealed or if the turbo is 
defective.

Fault codes

03:04-06

ã

37

Fault code 2400

Fault

The voltage has been above 4,79 V (greater 
than 8.3 bar relative pressure), i.e. above the 
upper limit for oil pressure.

Cause

The voltage between pin 3 and 4 in connector 
A9 is too high.

Remarks

The oil pressure gauge in the instrument panel 
indicates 2,5 bar, irrespective of engine speed.

If the voltage is outside the permitted range, the 
control unit uses a pre-programmed pressure 
value (2.5 bar relative pressure).

Action

Check the signal from the oil pressure sensor.

Check any visible faults on the oil pressure 
sensor, connectors and wiring.

Then, erase the fault code memory and check 
whether the fault code is generated again.

Fault codes