Двигатели Scania четвёртой серии. Руководство — часть 149

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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

ã

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