E39 / P0234 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Malfunction Indicator Lamp
Turbocharger Overboost Detected
Fault symptom
Malfunction Indicator Lamp
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Engine speed between 1600 and 6000 rpm. |
| Requested boost pressure between 140-300 kPa. |
| Atmospheric pressure between 60 and 120 kPa. |
| "Limp home" function not active. |
| The following diagnostic trouble codes may not be generated: |
| P0010, P0011, P0013, P0014 |
| P0111, P0112, P0113, P0114 |
| P0116, P0117, P0118, P0119 |
Fault criteria:
| Current boost pressure exceeds requested boost pressure for more than 1,5 s. |
OK report:
| Drive the car in 3rd gear, even acceleration at 1900 rpm. Then full gas acceleration (pedal not depressed 100%) up to 5000 rpm. |
Diagnostic help
Diagnosis regards:
| Turbo system fault causing high boost pressure. |
Functions in the diagnostic tool related to the fault:
| • | Charge Air Absolute Pressure |
| • | Atmosphere Absoslute Pressure |
| • | Charge Air Control Valve |
| (See also description of readings/activations in diagnostic tool) |
