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Part 4

14 COMPREHENSIVE COMPONENTS MONITORING Contd.

14.9 Pressure sensor monitoring

Applicable only for test group:






14.9.1 General Description
To monitor the pressures in the intake air system and the ambient pressure, a total of four pressure sensors are used. The supercharger module has one pressure sensor between the throttle and the compressor and one pressure sensor per bank after the compressor in the intake manifold (boost pressure sensor). To measure the ambient pressure, one pressure sensor is located in the ECM.
After a sufficiently long engine-off time, a pressure value close to the ambient pressure can be expected at all four pressure sensors. During part-load engine operation it can be expected that the pressures after the throttle and those in the two intake manifolds are approximately equal.






Signal Range Checks

Monitoring Strategy

For MAP Sensor monitoring:
At engine start, the difference between the intake manifold absolute pressure (boost pressure) of bank 1 and 2 and the mean value of all four pressure sensor measurement values is compared to a threshold value.

For pressure sensor after throttle monitoring:
At engine start, the difference between the pressure after the throttle and the mean value of all four pressure sensor measurement values is compared to a threshold value.

For ambient pressure sensor monitoring:
At engine start, the difference between the ambient pressure and the mean value of all four pressure sensor measurement values is compared to a threshold value.

Typical Enable Conditions
- Engine-off time > threshold value
The engine must have been turned off for a sufficiently long time (several seconds) so that approximately ambient pressure is present at all sensors.

- Engine speed < threshold value

14.9.2 MAP sensor, signal too high / low, P0236 / P0240
Signal too high: Bank1: P0236 Bank 2: P0240
Signal too low: Bank1: P0236 Bank 2: P0240

If the difference between the measured value of the MAP sensor (boost pressure sensor) of bank 1 / 2 and the mean value of all four pressure sensor measurement values is greater than a positive threshold value, the fault "MAP sensor bank 1 / 2, signal too high" is detected.

If the difference between the measured value of the intake manifold absolute pressure sensor (boost pressure sensor) of bank 1 / 2 and the mean value of all four pressure sensor measurement values is less than a negative threshold value, the fault "MAP sensor bank 1 / 2, signal too low" is detected.






14.9.3 Pressure sensor after the throttle, signal too high / low, P012B
If the difference between the measured pressure after the throttle and the mean value of all four pressure sensor measurement values is greater than a positive threshold value, the fault "pressure sensor after the throttle, signal too high" is detected.

If the difference between the measured pressure after the throttle and the mean value of all four pressure sensor measurement values is less than a negative threshold value, the fault "pressure sensor after the throttle, signal too low" is detected.






14.9.4 Ambient pressure sensor, signal too high / low, P1387
If the difference between the measured ambient pressure and the mean value of all four pressure sensor measurement values is greater than a positive threshold value, the fault "ambient pressure sensor, signal too high" is detected.

If the difference between the measured ambient pressure and the mean value of all four pressure sensor measurement values is less than a negative threshold value, the fault "ambient pressure sensor, signal too low" is detected.






14.9.5 MAP sensor, signal above the permitted range, P0238 / P0242
Bank 1: P0238 Bank 2: P0242

This monitor is carried out when several sensors measure a value that is too high because of an electrical potential drift (through contact resistance) being present in a common ground wire, which would cause the monitors described above to incorrectly detect the ambient pressure sensor as faulty.

If the measured intake manifold absolute pressure (boost pressure) of bank 1 / 2 is greater than a threshold value, the fault "MAP sensor bank 1 / 2, signal above the permitted range" is detected.






14.9.6 Pressure sensor after the throttle, signal above the permitted range, P012D
This monitor is carried out when several sensors measure a value that is too high because of an electrical potential drift (through contact resistance) being present in a common ground wire, which would cause the monitors described above to incorrectly detect the ambient pressure sensor as faulty.
If the measured pressure after the throttle is greater than a threshold value, the fault "pressure sensor after the throttle, signal above the permitted range" is detected.

Signal check during part load

Monitoring Strategy
For MAP Sensor monitoring:
During part load operation, the difference between the measured intake manifold absolute pressures (boost pressures) of bank 1 and bank 2, and the difference between the measured intake manifold absolute pressure (boost pressure) of bank 1 / 2 and the measured pressure after the throttle are each compared to a threshold value.

For pressure sensor after throttle monitoring:
During part load operation, the difference between the measured pressure after the throttle and the measured intake manifold absolute pressure (boost pressure) of bank 1, and the difference between the measured pressure after the throttle and the measured intake manifold absolute pressure (boost pressure) of bank 2 are each compared to a threshold value.

Typical Enable Conditions
- Time period since engine start > threshold value
- Engine speed in defined range
- Supercharger bypass valve in non-restricting position for defined time period

14.9.7 MAP sensor, signal during part load too high / low, P0236 / P0240
Signal too high: Bank 1: P0236 Bank 2: P0240
Signal too low: Bank 1: P0236 Bank 2: P0240

Signal during part load too high:
If the difference between the measured intake manifold absolute pressures (boost pressures) of bank 1 and bank 2 is greater than a positive threshold value AND the difference between the intake manifold absolute pressure (boost pressure) of bank 1 and the measured pressure after the throttle is greater than a positive threshold value, the fault "MAP sensor bank 1, signal during part load too high" is detected. If the difference between the measured intake manifold absolute pressures (boost pressures) of bank 2 and bank 1 is greater than a positive threshold value AND the difference between the measured intake manifold absolute pressure (boost pressure) of bank 2 and the measured pressure after the throttle is greater than a positive threshold value, the fault "MAP sensor bank 2, signal during part load too high" is detected.

Signal during part load too low
If the difference between the measured intake manifold absolute pressures (boost pressures) of bank 1 and bank 2 is less than a negative threshold value and the difference between the measured intake manifold absolute pressure (boost pressure) of bank 1 and the measured pressure after the throttle is less than a negative threshold value, the fault "MAP sensor bank 1, signal during part load too low" is detected. If the difference between the measured intake manifold absolute pressures (boost pressures) of bank 2 and bank 1 is less than a negative threshold value and the difference between the measured intake manifold absolute pressure (boost pressure) of bank 2 and the measured pressure after the throttle is less than a negative threshold value, the fault "MAP sensor bank 2, signal too low" is detected.






14.9.8 Pressure sensor after the throttle, signal during part load too high / low, P012B
If the difference between the measured pressure after the throttle and the measured intake manifold absolute pressure (boost pressure) of bank 1 is greater than a positive threshold value AND the difference between the measured pressure after the throttle and the measured intake manifold absolute pressure (boost pressure) of bank 2 is greater than a positive threshold value, the fault "pressure sensor after the throttle, signal during part load too high" is detected.

If the difference between the measured pressure after the throttle and the measured intake manifold absolute pressure (boost pressure) of bank 1 is less than a negative threshold value AND the difference between the measured pressure after the throttle and the measured intake manifold absolute pressure (boost pressure) of bank 2 is less than a negative threshold value, the fault "pressure sensor after the throttle, signal at part load too low" is detected.




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