T8 / P2227 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)
Limp home
Atmosphere Pressure Sensor Circuit, Performance Problem
Fault symptom
Fault indicator lamp (for further information see WIS Fault diagnosis, general)
Limp home
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Battery voltage must be between 11 - 16 V. |
| NONE of the following DTCs must be detected: |
Fault criteria:
| Atmospheric pressure sensor value differs more than 15 kPa from intake manifold absolute pressure sensor or 10 kPa from charge air absolute pressure sensor. The difference between both absolute pressure sensors may be max. 10 kPa. |
Dependent:
System reaction to a fault:
| Torque limited to max. 170Nm. |
| Tank bleeding adaption is blocked and reset. |
| Substitution value for atmospheric pressure = boost pressure value (before damper) upon start of engine. |
OK report:
| Fault criteria NOT fulfilled. |
Fault handling:
| (See section Fault handling III, "Other emission-related components and functions" for more information.) |
Checking the wiring harness
Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.
Diagnostic help
Diagnosis regards:
| Electrical fault in connecting leads or component. |
Functions in the diagnostic tool related to the fault:
| • | Manifold absolute pressure sensor |
| • | Absolute pressure sensor, charge air |
| (See also description of readings/activations in diagnostic tool) |
