S4wiki - User contributions [en]

Manifold air pressure

2019-11-06T22:17:42Z

Guitar24t: /* Transfer function */

"MAP" sensor in this context is a misnomer. The boost pressure sensor on the S4 is actually upstream of the throttle valve. The ECU itself simulates the pressure drop over the throttle plate to synthesize a calculated MAP pressure (in conjunction with MAF and RPM data, among other things). This also means that the data coming from this pressure sensor cannot be used to run in [[speed density]] mode w/o a MAF.

=Charge pressure sender G31=

[[Image:Charge_pressure_sender_G31.png|right|200px]]

The charge pressure sender is located
upstream of the throttle valve control part.

The Motronic supplies the sender with a
voltage of 5 volts and earth.
The signal which the sender generates is a
pressure-proportional voltage ranging from 0
to 5 volts.

At atmospheric pressure (14.7 psi or 1.01 bar at sea-level), the
voltage is approx. 1.88 volts.

The signal is used for charge pressure control.

The Motronic also needs information on
charge pressure so that it can take countermeasures if the maximum permissible
pressure is exceeded.

The absolute maximum pressure reading is approximately 2.55996 bar absolute (22.45 psi), which should read approximately 4.76 volts.
Pressure readings that deviate more than ~500mbar from specified pressure may cause [[throttle cut]].

The maximum pressure reading is not a function of the MAP sensor, but rather the pressure representation limit in the ECU's memory (a 16 bit, unsigned integer).

<math>0xffff/25.6 = 2559.9609375</math>

==Substitute function and self-diagnosis==
If sender G31 fails, the charge pressure is
controlled via the characteristic curve (engine
speed-dependent). This will result in a
deficiency of engine power.

==Transfer function==
The G31 is part number 078 906 051 (Bosch 0 281 002 177) - similar to
[http://nyet.org/cars/info/Map_Sensor_Technical_Specification.pdf Bosch Motorsport]
[http://rb-aa.bosch.com/boaasocs/index.jsp;jsessionid=4F3BFB57CC33BB211F80A84F59148E09.sundoro?ccat_id=110&prod_id=201 0 281 002 205]
or
[http://www.freescale.com/files/sensors/doc/data_sheet/MPX4250A.pdf Motorola/Freescale MPX4250A].

[[Image:BoschTransfer_small.png]]

where P1 = 0.2 bar and P2 = 2.5 bar, such that <math>V = 1.848 P + 0.03043</math>

'''Gradient and Offset Calculations'''

:<math>MINPRESSURE = 200mBar</math>
:<math>MAXPRESSURE = 2500mBar</math>
:<math>MINVOLTAGE = 0.4 Volts</math>
:<math>MAXVOLTAGE = 4.65 Volts</math>

:<math>DSLGRAD = (MAXPRESSURE - MINPRESSURE) / (MAXVOLTAGE - MINVOLTAGE) = 541.18</math>
:<math>DSLOFS = MAXPRESSURE - (DSLGRAD * MAXVOLTAGE) = -16.47</math>

From the calculations, we find the following for the stock MAP sensor (these are in accordance with the stock values in a file such as 551M):

'''DSLGRAD = 541.18'''

'''DSLOFS = -16.47'''

However, not all Bosch MAP sensors use the same transfer function. Another Bosch transfer function is shown here (type 2).

[[Image:BoschTransfer2_small.png]]

Ensure you are using the right characteristic curve to calculate the gradient and offset for the sensor.

==Bosch==
===OEM===
*0 281 002 177: 0.2-2.5 bar (078 906 051 - Audi 2.7t)
*0 281 002 399: 0.2-2.5 bar (038 906 051 B - VW Golf V TDI)
*0 281 002 401: 0.2-'''3.0 bar''' ('''038 906 051 C''' - Audi TTMKII/VW Jetta V TDI)
*0 281 006 060: 0.5-'''4.0 bar''' ('''03K 906 051''') (uses characteristic curve type 2)
*0 261 230 294: 0.5-'''3.5 bar''' ('''31303974 or 31355462''') - Volvo D3,D4,D5 2012+ (uses characteristic curve type 2)

===No temp sensor===
*0 281 002 487: 0.2-2.5 bar (one mounting hole)

===With temp sensor===
*0 281 002 399: 0.2-2.5 bar
*0 281 002 205: 0.2-2.5 bar
*0 261 230 042: 0.2-2.5 bar (one mounting hole)
*0 281 002 573: 0.2-2.5 bar (no mounting holes)
*0 281 002 437: 0.2-3.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)
*0 281 002 244: 0.5-3.5 bar
*0 281 002 456: 0.5-3.5 bar (one mounting hole) (uses characteristic curve type 2)
*0 281 002 316: 0.5-4.0 bar
*0 281 002 576: 0.5-4.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)

==Motorola==
===MPX4250A===
VOUT = VS (P × 0.004 - 0.04)
± (Pressure Error × Temp. Factor × 0.004 × VS)
VS = 5.1 V ± 0.25 VDC

[[Image:MPX4250A-transfer-function.png]]

=References=
* [http://forums.audiworld.com/s4/msgs/2271731.phtml AW discussion] on MAP sensor function

Manifold air pressure

2019-11-06T22:13:54Z

Guitar24t: /* OEM */

"MAP" sensor in this context is a misnomer. The boost pressure sensor on the S4 is actually upstream of the throttle valve. The ECU itself simulates the pressure drop over the throttle plate to synthesize a calculated MAP pressure (in conjunction with MAF and RPM data, among other things). This also means that the data coming from this pressure sensor cannot be used to run in [[speed density]] mode w/o a MAF.

=Charge pressure sender G31=

[[Image:Charge_pressure_sender_G31.png|right|200px]]

The charge pressure sender is located
upstream of the throttle valve control part.

The Motronic supplies the sender with a
voltage of 5 volts and earth.
The signal which the sender generates is a
pressure-proportional voltage ranging from 0
to 5 volts.

At atmospheric pressure (14.7 psi or 1.01 bar at sea-level), the
voltage is approx. 1.88 volts.

The signal is used for charge pressure control.

The Motronic also needs information on
charge pressure so that it can take countermeasures if the maximum permissible
pressure is exceeded.

The absolute maximum pressure reading is approximately 2.55996 bar absolute (22.45 psi), which should read approximately 4.76 volts.
Pressure readings that deviate more than ~500mbar from specified pressure may cause [[throttle cut]].

The maximum pressure reading is not a function of the MAP sensor, but rather the pressure representation limit in the ECU's memory (a 16 bit, unsigned integer).

<math>0xffff/25.6 = 2559.9609375</math>

==Substitute function and self-diagnosis==
If sender G31 fails, the charge pressure is
controlled via the characteristic curve (engine
speed-dependent). This will result in a
deficiency of engine power.

==Transfer function==
The G31 is part number 078 906 051 (Bosch 0 281 002 177) - similar to
[http://nyet.org/cars/info/Map_Sensor_Technical_Specification.pdf Bosch Motorsport]
[http://rb-aa.bosch.com/boaasocs/index.jsp;jsessionid=4F3BFB57CC33BB211F80A84F59148E09.sundoro?ccat_id=110&prod_id=201 0 281 002 205]
or
[http://www.freescale.com/files/sensors/doc/data_sheet/MPX4250A.pdf Motorola/Freescale MPX4250A].

[[Image:BoschTransfer_small.png]]

where P1 = 0.2 bar and P2 = 2.5 bar, such that <math>V = 1.848 P + 0.03043</math>

'''Gradient and Offset Calculations'''

:<math>MINPRESSURE = 200mBar</math>
:<math>MAXPRESSURE = 2500mBar</math>
:<math>MINVOLTAGE = 0.4 Volts</math>
:<math>MAXVOLTAGE = 4.65 Volts</math>

:<math>DSLGRAD = (MAXPRESSURE - MINPRESSURE) / (MAXVOLTAGE - MINVOLTAGE) = 541.18</math>
:<math>DSLOFS = MAXPRESSURE - (DSLGRAD * MAXVOLTAGE) = -16.47</math>

From the calculations, we find the following for the stock MAP sensor (these are in accordance with the stock values in a file such as 551M):

'''DSLGRAD = 541.18'''

'''DSLOFS = -16.47'''

However, not all Bosch MAP sensors use the same transfer function. Another Bosch transfer function is shown here (type 2).
[[Image:BoschTransfer2_small.png]]

Ensure you are using the right characteristic curve to calculate the gradient and offset for the sensor.

==Bosch==
===OEM===
*0 281 002 177: 0.2-2.5 bar (078 906 051 - Audi 2.7t)
*0 281 002 399: 0.2-2.5 bar (038 906 051 B - VW Golf V TDI)
*0 281 002 401: 0.2-'''3.0 bar''' ('''038 906 051 C''' - Audi TTMKII/VW Jetta V TDI)
*0 281 006 060: 0.5-'''4.0 bar''' ('''03K 906 051''') (uses characteristic curve type 2)
*0 261 230 294: 0.5-'''3.5 bar''' ('''31303974 or 31355462''') - Volvo D3,D4,D5 2012+ (uses characteristic curve type 2)

===No temp sensor===
*0 281 002 487: 0.2-2.5 bar (one mounting hole)

===With temp sensor===
*0 281 002 399: 0.2-2.5 bar
*0 281 002 205: 0.2-2.5 bar
*0 261 230 042: 0.2-2.5 bar (one mounting hole)
*0 281 002 573: 0.2-2.5 bar (no mounting holes)
*0 281 002 437: 0.2-3.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)
*0 281 002 244: 0.5-3.5 bar
*0 281 002 456: 0.5-3.5 bar (one mounting hole) (uses characteristic curve type 2)
*0 281 002 316: 0.5-4.0 bar
*0 281 002 576: 0.5-4.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)

==Motorola==
===MPX4250A===
VOUT = VS (P × 0.004 - 0.04)
± (Pressure Error × Temp. Factor × 0.004 × VS)
VS = 5.1 V ± 0.25 VDC

[[Image:MPX4250A-transfer-function.png]]

=References=
* [http://forums.audiworld.com/s4/msgs/2271731.phtml AW discussion] on MAP sensor function

Manifold air pressure

2019-11-06T22:13:38Z

Guitar24t: /* OEM */

"MAP" sensor in this context is a misnomer. The boost pressure sensor on the S4 is actually upstream of the throttle valve. The ECU itself simulates the pressure drop over the throttle plate to synthesize a calculated MAP pressure (in conjunction with MAF and RPM data, among other things). This also means that the data coming from this pressure sensor cannot be used to run in [[speed density]] mode w/o a MAF.

=Charge pressure sender G31=

[[Image:Charge_pressure_sender_G31.png|right|200px]]

The charge pressure sender is located
upstream of the throttle valve control part.

The Motronic supplies the sender with a
voltage of 5 volts and earth.
The signal which the sender generates is a
pressure-proportional voltage ranging from 0
to 5 volts.

At atmospheric pressure (14.7 psi or 1.01 bar at sea-level), the
voltage is approx. 1.88 volts.

The signal is used for charge pressure control.

The Motronic also needs information on
charge pressure so that it can take countermeasures if the maximum permissible
pressure is exceeded.

The absolute maximum pressure reading is approximately 2.55996 bar absolute (22.45 psi), which should read approximately 4.76 volts.
Pressure readings that deviate more than ~500mbar from specified pressure may cause [[throttle cut]].

The maximum pressure reading is not a function of the MAP sensor, but rather the pressure representation limit in the ECU's memory (a 16 bit, unsigned integer).

<math>0xffff/25.6 = 2559.9609375</math>

==Substitute function and self-diagnosis==
If sender G31 fails, the charge pressure is
controlled via the characteristic curve (engine
speed-dependent). This will result in a
deficiency of engine power.

==Transfer function==
The G31 is part number 078 906 051 (Bosch 0 281 002 177) - similar to
[http://nyet.org/cars/info/Map_Sensor_Technical_Specification.pdf Bosch Motorsport]
[http://rb-aa.bosch.com/boaasocs/index.jsp;jsessionid=4F3BFB57CC33BB211F80A84F59148E09.sundoro?ccat_id=110&prod_id=201 0 281 002 205]
or
[http://www.freescale.com/files/sensors/doc/data_sheet/MPX4250A.pdf Motorola/Freescale MPX4250A].

[[Image:BoschTransfer_small.png]]

where P1 = 0.2 bar and P2 = 2.5 bar, such that <math>V = 1.848 P + 0.03043</math>

'''Gradient and Offset Calculations'''

:<math>MINPRESSURE = 200mBar</math>
:<math>MAXPRESSURE = 2500mBar</math>
:<math>MINVOLTAGE = 0.4 Volts</math>
:<math>MAXVOLTAGE = 4.65 Volts</math>

:<math>DSLGRAD = (MAXPRESSURE - MINPRESSURE) / (MAXVOLTAGE - MINVOLTAGE) = 541.18</math>
:<math>DSLOFS = MAXPRESSURE - (DSLGRAD * MAXVOLTAGE) = -16.47</math>

From the calculations, we find the following for the stock MAP sensor (these are in accordance with the stock values in a file such as 551M):

'''DSLGRAD = 541.18'''

'''DSLOFS = -16.47'''

However, not all Bosch MAP sensors use the same transfer function. Another Bosch transfer function is shown here (type 2).
[[Image:BoschTransfer2_small.png]]

Ensure you are using the right characteristic curve to calculate the gradient and offset for the sensor.

==Bosch==
===OEM===
*0 281 002 177: 0.2-2.5 bar (078 906 051 - Audi 2.7t)
*0 281 002 399: 0.2-2.5 bar (038 906 051 B - VW Golf V TDI)
*0 281 002 401: 0.2-'''3.0 bar''' ('''038 906 051 C''' - Audi TTMKII/VW Jetta V TDI)
*0 281 006 060: 0.5-'''4.0 bar''' ('''03K 906 051''') (uses characteristic curve type 2)
*0 261 230 294: 0.5-'''3.5 bar''' (''31303974 or 31355462''') - Volvo D3,D4,D5 2012+ (uses characteristic curve type 2)

===No temp sensor===
*0 281 002 487: 0.2-2.5 bar (one mounting hole)

===With temp sensor===
*0 281 002 399: 0.2-2.5 bar
*0 281 002 205: 0.2-2.5 bar
*0 261 230 042: 0.2-2.5 bar (one mounting hole)
*0 281 002 573: 0.2-2.5 bar (no mounting holes)
*0 281 002 437: 0.2-3.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)
*0 281 002 244: 0.5-3.5 bar
*0 281 002 456: 0.5-3.5 bar (one mounting hole) (uses characteristic curve type 2)
*0 281 002 316: 0.5-4.0 bar
*0 281 002 576: 0.5-4.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)

==Motorola==
===MPX4250A===
VOUT = VS (P × 0.004 - 0.04)
± (Pressure Error × Temp. Factor × 0.004 × VS)
VS = 5.1 V ± 0.25 VDC

[[Image:MPX4250A-transfer-function.png]]

=References=
* [http://forums.audiworld.com/s4/msgs/2271731.phtml AW discussion] on MAP sensor function

Manifold air pressure

2014-08-17T08:00:37Z

Guitar24t: /* OEM */

"MAP" sensor in this context is a misnomer. The boost pressure sensor on the S4 is actually upstream of the throttle valve. The ECU itself simulates the pressure drop over the throttle plate to synthesize a calculated MAP pressure (in conjunction with MAF and RPM data, among other things). This also means that the data coming from this pressure sensor cannot be used to run in [[speed density]] mode w/o a MAF.

=Charge pressure sender G31=

[[Image:Charge_pressure_sender_G31.png|right|200px]]

The charge pressure sender is located
upstream of the throttle valve control part.

The Motronic supplies the sender with a
voltage of 5 volts and earth.
The signal which the sender generates is a
pressure-proportional voltage ranging from 0
to 5 volts.

At atmospheric pressure (14.7 psi or 1.01 bar at sea-level), the
voltage is approx. 1.88 volts.

The signal is used for charge pressure control.

The Motronic also needs information on
charge pressure so that it can take countermeasures if the maximum permissible
pressure is exceeded.

The absolute maximum pressure reading is approximately 2.55996 bar absolute (22.45 psi), which should read approximately 4.76 volts.
Pressure readings that deviate more than ~500mbar from specified pressure may cause [[throttle cut]].

The maximum pressure reading is not a function of the MAP sensor, but rather the pressure representation limit in the ECU's memory (a 16 bit, unsigned integer).

<math>0xffff/25.6 = 2559.9609375</math>

==Substitute function and self-diagnosis==
If sender G31 fails, the charge pressure is
controlled via the characteristic curve (engine
speed-dependent). This will result in a
deficiency of engine power.

==Transfer function==
The G31 is part number 078 906 051 (Bosch 0 281 002 177) - similar to
[http://nyet.org/cars/info/Map_Sensor_Technical_Specification.pdf Bosch Motorsport]
[http://rb-aa.bosch.com/boaasocs/index.jsp;jsessionid=4F3BFB57CC33BB211F80A84F59148E09.sundoro?ccat_id=110&prod_id=201 0 281 002 205]
or
[http://www.freescale.com/files/sensors/doc/data_sheet/MPX4250A.pdf Motorola/Freescale MPX4250A].

[[Image:BoschTransfer_small.png]]

where P1 = 0.2 bar and P2 = 2.5 bar, such that <math>V = 1.848 P + 0.03043</math>

'''Gradient and Offset Calculations'''

:<math>MINPRESSURE = 200mBar</math>
:<math>MAXPRESSURE = 2500mBar</math>
:<math>MINVOLTAGE = 0.4 Volts</math>
:<math>MAXVOLTAGE = 4.65 Volts</math>

:<math>DSLGRAD = (MAXPRESSURE - MINPRESSURE) / (MAXVOLTAGE - MINVOLTAGE) = 541.18</math>
:<math>DSLOFS = MAXPRESSURE - (DSLGRAD * MAXVOLTAGE) = -16.47</math>

From the calculations, we find the following for the stock MAP sensor (these are in accordance with the stock values in a file such as 551M):

'''DSLGRAD = 541.18'''

'''DSLOFS = -16.47'''

However, not all Bosch MAP sensors use the same transfer function. Another Bosch transfer function is shown here (type 2).
[[Image:BoschTransfer2_small.png]]

Ensure you are using the right characteristic curve to calculate the gradient and offset for the sensor.

==Bosch==
===OEM===
*0 281 002 177: 0.2?-2.5 bar (078 906 051 - Audi 2.7t)
*0 281 002 399: 0.2-2.5 bar (038 906 051 B - VW Golf V TDI)
*0 281 002 401: 0.2-3.0 bar (038 906 051 C - Audi TTMKII/VW Jetta V TDI)
*0 281 006 060: 0.5-4.0 bar (03K 906 051) (uses characteristic curve type 2)

===No temp sensor===
*0 281 002 487: 0.2-2.5 bar (one mounting hole)

===With temp sensor===
*0 281 002 399: 0.2-2.5 bar
*0 281 002 205: 0.2-2.5 bar
*0 261 230 042: 0.2-2.5 bar (one mounting hole)
*0 281 002 573: 0.2-2.5 bar (no mounting holes)
*0 281 002 437: 0.2-3.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)
*0 281 002 244: 0.5-3.5 bar
*0 281 002 456: 0.5-3.5 bar (one mounting hole) (uses characteristic curve type 2)
*0 281 002 316: 0.5-4.0 bar
*0 281 002 576: 0.5-4.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)

==Motorola==
===MPX4250A===
VOUT = VS (P × 0.004 - 0.04)
± (Pressure Error × Temp. Factor × 0.004 × VS)
VS = 5.1 V ± 0.25 VDC

[[Image:MPX4250A-transfer-function.png]]

=References=
* [http://forums.audiworld.com/s4/msgs/2271731.phtml AW discussion] on MAP sensor function

Manifold air pressure

2014-08-17T07:58:02Z

Guitar24t: /* Transfer function */

"MAP" sensor in this context is a misnomer. The boost pressure sensor on the S4 is actually upstream of the throttle valve. The ECU itself simulates the pressure drop over the throttle plate to synthesize a calculated MAP pressure (in conjunction with MAF and RPM data, among other things). This also means that the data coming from this pressure sensor cannot be used to run in [[speed density]] mode w/o a MAF.

=Charge pressure sender G31=

[[Image:Charge_pressure_sender_G31.png|right|200px]]

The charge pressure sender is located
upstream of the throttle valve control part.

The Motronic supplies the sender with a
voltage of 5 volts and earth.
The signal which the sender generates is a
pressure-proportional voltage ranging from 0
to 5 volts.

At atmospheric pressure (14.7 psi or 1.01 bar at sea-level), the
voltage is approx. 1.88 volts.

The signal is used for charge pressure control.

The Motronic also needs information on
charge pressure so that it can take countermeasures if the maximum permissible
pressure is exceeded.

The absolute maximum pressure reading is approximately 2.55996 bar absolute (22.45 psi), which should read approximately 4.76 volts.
Pressure readings that deviate more than ~500mbar from specified pressure may cause [[throttle cut]].

The maximum pressure reading is not a function of the MAP sensor, but rather the pressure representation limit in the ECU's memory (a 16 bit, unsigned integer).

<math>0xffff/25.6 = 2559.9609375</math>

==Substitute function and self-diagnosis==
If sender G31 fails, the charge pressure is
controlled via the characteristic curve (engine
speed-dependent). This will result in a
deficiency of engine power.

==Transfer function==
The G31 is part number 078 906 051 (Bosch 0 281 002 177) - similar to
[http://nyet.org/cars/info/Map_Sensor_Technical_Specification.pdf Bosch Motorsport]
[http://rb-aa.bosch.com/boaasocs/index.jsp;jsessionid=4F3BFB57CC33BB211F80A84F59148E09.sundoro?ccat_id=110&prod_id=201 0 281 002 205]
or
[http://www.freescale.com/files/sensors/doc/data_sheet/MPX4250A.pdf Motorola/Freescale MPX4250A].

[[Image:BoschTransfer_small.png]]

where P1 = 0.2 bar and P2 = 2.5 bar, such that <math>V = 1.848 P + 0.03043</math>

'''Gradient and Offset Calculations'''

:<math>MINPRESSURE = 200mBar</math>
:<math>MAXPRESSURE = 2500mBar</math>
:<math>MINVOLTAGE = 0.4 Volts</math>
:<math>MAXVOLTAGE = 4.65 Volts</math>

:<math>DSLGRAD = (MAXPRESSURE - MINPRESSURE) / (MAXVOLTAGE - MINVOLTAGE) = 541.18</math>
:<math>DSLOFS = MAXPRESSURE - (DSLGRAD * MAXVOLTAGE) = -16.47</math>

From the calculations, we find the following for the stock MAP sensor (these are in accordance with the stock values in a file such as 551M):

'''DSLGRAD = 541.18'''

'''DSLOFS = -16.47'''

However, not all Bosch MAP sensors use the same transfer function. Another Bosch transfer function is shown here (type 2).
[[Image:BoschTransfer2_small.png]]

Ensure you are using the right characteristic curve to calculate the gradient and offset for the sensor.

==Bosch==
===OEM===
*0 281 002 177: 0.2?-2.5 bar (078 906 051 - Audi 2.7t)
*0 281 002 399: 0.2-2.5 bar (038 906 051 B - VW Golf V TDI)
*0 281 002 401: 0.2-3.0 bar (038 906 051 C - Audi TTMKII/VW Jetta V TDI)
*0 281 006 060: ?.?-4.0 bar (03K 906 051)

===No temp sensor===
*0 281 002 487: 0.2-2.5 bar (one mounting hole)

===With temp sensor===
*0 281 002 399: 0.2-2.5 bar
*0 281 002 205: 0.2-2.5 bar
*0 261 230 042: 0.2-2.5 bar (one mounting hole)
*0 281 002 573: 0.2-2.5 bar (no mounting holes)
*0 281 002 437: 0.2-3.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)
*0 281 002 244: 0.5-3.5 bar
*0 281 002 456: 0.5-3.5 bar (one mounting hole) (uses characteristic curve type 2)
*0 281 002 316: 0.5-4.0 bar
*0 281 002 576: 0.5-4.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)

==Motorola==
===MPX4250A===
VOUT = VS (P × 0.004 - 0.04)
± (Pressure Error × Temp. Factor × 0.004 × VS)
VS = 5.1 V ± 0.25 VDC

[[Image:MPX4250A-transfer-function.png]]

=References=
* [http://forums.audiworld.com/s4/msgs/2271731.phtml AW discussion] on MAP sensor function

Manifold air pressure

2014-08-17T07:56:30Z

Guitar24t: /* With temp sensor */

"MAP" sensor in this context is a misnomer. The boost pressure sensor on the S4 is actually upstream of the throttle valve. The ECU itself simulates the pressure drop over the throttle plate to synthesize a calculated MAP pressure (in conjunction with MAF and RPM data, among other things). This also means that the data coming from this pressure sensor cannot be used to run in [[speed density]] mode w/o a MAF.

=Charge pressure sender G31=

[[Image:Charge_pressure_sender_G31.png|right|200px]]

The charge pressure sender is located
upstream of the throttle valve control part.

The Motronic supplies the sender with a
voltage of 5 volts and earth.
The signal which the sender generates is a
pressure-proportional voltage ranging from 0
to 5 volts.

At atmospheric pressure (14.7 psi or 1.01 bar at sea-level), the
voltage is approx. 1.88 volts.

The signal is used for charge pressure control.

The Motronic also needs information on
charge pressure so that it can take countermeasures if the maximum permissible
pressure is exceeded.

The absolute maximum pressure reading is approximately 2.55996 bar absolute (22.45 psi), which should read approximately 4.76 volts.
Pressure readings that deviate more than ~500mbar from specified pressure may cause [[throttle cut]].

The maximum pressure reading is not a function of the MAP sensor, but rather the pressure representation limit in the ECU's memory (a 16 bit, unsigned integer).

<math>0xffff/25.6 = 2559.9609375</math>

==Substitute function and self-diagnosis==
If sender G31 fails, the charge pressure is
controlled via the characteristic curve (engine
speed-dependent). This will result in a
deficiency of engine power.

==Transfer function==
The G31 is part number 078 906 051 (Bosch 0 281 002 177) - similar to
[http://nyet.org/cars/info/Map_Sensor_Technical_Specification.pdf Bosch Motorsport]
[http://rb-aa.bosch.com/boaasocs/index.jsp;jsessionid=4F3BFB57CC33BB211F80A84F59148E09.sundoro?ccat_id=110&prod_id=201 0 281 002 205]
or
[http://www.freescale.com/files/sensors/doc/data_sheet/MPX4250A.pdf Motorola/Freescale MPX4250A].

[[Image:BoschTransfer_small.png]]

where P1 = 0.2 bar and P2 = 2.5 bar, such that <math>V = 1.848 P + 0.03043</math>

'''Gradient and Offset Calculations'''

:<math>MINPRESSURE = 200mBar</math>
:<math>MAXPRESSURE = 2500mBar</math>
:<math>MINVOLTAGE = 0.4 Volts</math>
:<math>MAXVOLTAGE = 4.65 Volts</math>

:<math>DSLGRAD = (MAXPRESSURE - MINPRESSURE) / (MAXVOLTAGE - MINVOLTAGE) = 541.18</math>
:<math>DSLOFS = MAXPRESSURE - (DSLGRAD * MAXVOLTAGE) = -16.47</math>

From the calculations, we find the following for the stock MAP sensor (these are in accordance with the stock values in a file such as 551M):

'''DSLGRAD = 541.18'''

'''DSLOFS = -16.47'''

However, not all Bosch MAP sensors use the same transfer function. Another Bosch transfer function is shown here.
[[Image:BoschTransfer2_small.png]]

Ensure you are using the right characteristic curve to calculate the gradient and offset for the sensor.

==Bosch==
===OEM===
*0 281 002 177: 0.2?-2.5 bar (078 906 051 - Audi 2.7t)
*0 281 002 399: 0.2-2.5 bar (038 906 051 B - VW Golf V TDI)
*0 281 002 401: 0.2-3.0 bar (038 906 051 C - Audi TTMKII/VW Jetta V TDI)
*0 281 006 060: ?.?-4.0 bar (03K 906 051)

===No temp sensor===
*0 281 002 487: 0.2-2.5 bar (one mounting hole)

===With temp sensor===
*0 281 002 399: 0.2-2.5 bar
*0 281 002 205: 0.2-2.5 bar
*0 261 230 042: 0.2-2.5 bar (one mounting hole)
*0 281 002 573: 0.2-2.5 bar (no mounting holes)
*0 281 002 437: 0.2-3.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)
*0 281 002 244: 0.5-3.5 bar
*0 281 002 456: 0.5-3.5 bar (one mounting hole) (uses characteristic curve type 2)
*0 281 002 316: 0.5-4.0 bar
*0 281 002 576: 0.5-4.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)

==Motorola==
===MPX4250A===
VOUT = VS (P × 0.004 - 0.04)
± (Pressure Error × Temp. Factor × 0.004 × VS)
VS = 5.1 V ± 0.25 VDC

[[Image:MPX4250A-transfer-function.png]]

=References=
* [http://forums.audiworld.com/s4/msgs/2271731.phtml AW discussion] on MAP sensor function

Manifold air pressure

2014-08-17T07:54:10Z

Guitar24t: /* Transfer function */ Added math for gradient and offset calculations as well as a second type of transfer function

"MAP" sensor in this context is a misnomer. The boost pressure sensor on the S4 is actually upstream of the throttle valve. The ECU itself simulates the pressure drop over the throttle plate to synthesize a calculated MAP pressure (in conjunction with MAF and RPM data, among other things). This also means that the data coming from this pressure sensor cannot be used to run in [[speed density]] mode w/o a MAF.

=Charge pressure sender G31=

[[Image:Charge_pressure_sender_G31.png|right|200px]]

The charge pressure sender is located
upstream of the throttle valve control part.

The Motronic supplies the sender with a
voltage of 5 volts and earth.
The signal which the sender generates is a
pressure-proportional voltage ranging from 0
to 5 volts.

At atmospheric pressure (14.7 psi or 1.01 bar at sea-level), the
voltage is approx. 1.88 volts.

The signal is used for charge pressure control.

The Motronic also needs information on
charge pressure so that it can take countermeasures if the maximum permissible
pressure is exceeded.

The absolute maximum pressure reading is approximately 2.55996 bar absolute (22.45 psi), which should read approximately 4.76 volts.
Pressure readings that deviate more than ~500mbar from specified pressure may cause [[throttle cut]].

The maximum pressure reading is not a function of the MAP sensor, but rather the pressure representation limit in the ECU's memory (a 16 bit, unsigned integer).

<math>0xffff/25.6 = 2559.9609375</math>

==Substitute function and self-diagnosis==
If sender G31 fails, the charge pressure is
controlled via the characteristic curve (engine
speed-dependent). This will result in a
deficiency of engine power.

==Transfer function==
The G31 is part number 078 906 051 (Bosch 0 281 002 177) - similar to
[http://nyet.org/cars/info/Map_Sensor_Technical_Specification.pdf Bosch Motorsport]
[http://rb-aa.bosch.com/boaasocs/index.jsp;jsessionid=4F3BFB57CC33BB211F80A84F59148E09.sundoro?ccat_id=110&prod_id=201 0 281 002 205]
or
[http://www.freescale.com/files/sensors/doc/data_sheet/MPX4250A.pdf Motorola/Freescale MPX4250A].

[[Image:BoschTransfer_small.png]]

where P1 = 0.2 bar and P2 = 2.5 bar, such that <math>V = 1.848 P + 0.03043</math>

'''Gradient and Offset Calculations'''

:<math>MINPRESSURE = 200mBar</math>
:<math>MAXPRESSURE = 2500mBar</math>
:<math>MINVOLTAGE = 0.4 Volts</math>
:<math>MAXVOLTAGE = 4.65 Volts</math>

:<math>DSLGRAD = (MAXPRESSURE - MINPRESSURE) / (MAXVOLTAGE - MINVOLTAGE) = 541.18</math>
:<math>DSLOFS = MAXPRESSURE - (DSLGRAD * MAXVOLTAGE) = -16.47</math>

From the calculations, we find the following for the stock MAP sensor (these are in accordance with the stock values in a file such as 551M):

'''DSLGRAD = 541.18'''

'''DSLOFS = -16.47'''

However, not all Bosch MAP sensors use the same transfer function. Another Bosch transfer function is shown here.
[[Image:BoschTransfer2_small.png]]

Ensure you are using the right characteristic curve to calculate the gradient and offset for the sensor.

==Bosch==
===OEM===
*0 281 002 177: 0.2?-2.5 bar (078 906 051 - Audi 2.7t)
*0 281 002 399: 0.2-2.5 bar (038 906 051 B - VW Golf V TDI)
*0 281 002 401: 0.2-3.0 bar (038 906 051 C - Audi TTMKII/VW Jetta V TDI)
*0 281 006 060: ?.?-4.0 bar (03K 906 051)

===No temp sensor===
*0 281 002 487: 0.2-2.5 bar (one mounting hole)

===With temp sensor===
*0 281 002 399: 0.2-2.5 bar
*0 281 002 205: 0.2-2.5 bar
*0 261 230 042: 0.2-2.5 bar (one mounting hole)
*0 281 002 573: 0.2-2.5 bar (no mounting holes)
*0 281 002 437: 0.2-3.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)
*0 281 002 244: 0.5-3.5 bar
*0 281 002 456: 0.5-3.5 bar (one mounting hole)
*0 281 002 316: 0.5-4.0 bar
*0 281 002 576: 0.5-4.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)

==Motorola==
===MPX4250A===
VOUT = VS (P × 0.004 - 0.04)
± (Pressure Error × Temp. Factor × 0.004 × VS)
VS = 5.1 V ± 0.25 VDC

[[Image:MPX4250A-transfer-function.png]]

=References=
* [http://forums.audiworld.com/s4/msgs/2271731.phtml AW discussion] on MAP sensor function

File:BoschTransfer2 small.png

2014-08-17T07:31:50Z

Guitar24t: Bosch Transfer Function 2

Bosch Transfer Function 2

File:BoschTransfer small.png

2014-08-17T07:31:26Z

Guitar24t: Bosch Transfer Function 1

Bosch Transfer Function 1

File:MAPSensorGradient.png

2014-08-17T07:26:55Z

Guitar24t: Map Sensor Gradient and Offset Math

Map Sensor Gradient and Offset Math

File:BoschTransfer2.png

2014-08-17T07:20:03Z

Guitar24t: Bosch MAP Sensor Transfer Function Type 2

Bosch MAP Sensor Transfer Function Type 2

Manifold air pressure

2014-08-17T07:07:15Z

Guitar24t: Fixed error in boost pressure sensor value

"MAP" sensor in this context is a misnomer. The boost pressure sensor on the S4 is actually upstream of the throttle valve. The ECU itself simulates the pressure drop over the throttle plate to synthesize a calculated MAP pressure (in conjunction with MAF and RPM data, among other things). This also means that the data coming from this pressure sensor cannot be used to run in [[speed density]] mode w/o a MAF.

=Charge pressure sender G31=

[[Image:Charge_pressure_sender_G31.png|right|200px]]

The charge pressure sender is located
upstream of the throttle valve control part.

The Motronic supplies the sender with a
voltage of 5 volts and earth.
The signal which the sender generates is a
pressure-proportional voltage ranging from 0
to 5 volts.

At atmospheric pressure (14.7 psi or 1.01 bar at sea-level), the
voltage is approx. 1.88 volts.

The signal is used for charge pressure control.

The Motronic also needs information on
charge pressure so that it can take countermeasures if the maximum permissible
pressure is exceeded.

The absolute maximum pressure reading is approximately 2.55996 bar absolute (22.45 psi), which should read approximately 4.76 volts.
Pressure readings that deviate more than ~500mbar from specified pressure may cause [[throttle cut]].

The maximum pressure reading is not a function of the MAP sensor, but rather the pressure representation limit in the ECU's memory (a 16 bit, unsigned integer).

<math>0xffff/25.6 = 2559.9609375</math>

==Substitute function and self-diagnosis==
If sender G31 fails, the charge pressure is
controlled via the characteristic curve (engine
speed-dependent). This will result in a
deficiency of engine power.

==Transfer function==
The G31 is part number 078 906 051 (Bosch 0 281 002 177) - similar to
[http://nyet.org/cars/info/Map_Sensor_Technical_Specification.pdf Bosch Motorsport]
[http://rb-aa.bosch.com/boaasocs/index.jsp;jsessionid=4F3BFB57CC33BB211F80A84F59148E09.sundoro?ccat_id=110&prod_id=201 0 281 002 205]
or
[http://www.freescale.com/files/sensors/doc/data_sheet/MPX4250A.pdf Motorola/Freescale MPX4250A].

[[Image:Bosch 0281002250.jpg]]

where P1 = 0.2 bar and P2 = 2.5 bar, such that <math>V = 1.848 P + 0.03043</math>

==Bosch==
===OEM===
*0 281 002 177: 0.2?-2.5 bar (078 906 051 - Audi 2.7t)
*0 281 002 399: 0.2-2.5 bar (038 906 051 B - VW Golf V TDI)
*0 281 002 401: 0.2-3.0 bar (038 906 051 C - Audi TTMKII/VW Jetta V TDI)
*0 281 006 060: ?.?-4.0 bar (03K 906 051)

===No temp sensor===
*0 281 002 487: 0.2-2.5 bar (one mounting hole)

===With temp sensor===
*0 281 002 399: 0.2-2.5 bar
*0 281 002 205: 0.2-2.5 bar
*0 261 230 042: 0.2-2.5 bar (one mounting hole)
*0 281 002 573: 0.2-2.5 bar (no mounting holes)
*0 281 002 437: 0.2-3.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)
*0 281 002 244: 0.5-3.5 bar
*0 281 002 456: 0.5-3.5 bar (one mounting hole)
*0 281 002 316: 0.5-4.0 bar
*0 281 002 576: 0.5-4.0 bar (one mounting hole)
*0 261 230 105: 0.2-3.0 bar (one mounting hole)

==Motorola==
===MPX4250A===
VOUT = VS (P × 0.004 - 0.04)
± (Pressure Error × Temp. Factor × 0.004 × VS)
VS = 5.1 V ± 0.25 VDC

[[Image:MPX4250A-transfer-function.png]]

=References=
* [http://forums.audiworld.com/s4/msgs/2271731.phtml AW discussion] on MAP sensor function