T8 / P0034 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
Charge Air Bypass Valve Circuit. Open / Short to Ground.
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. |
| Output to solenoid valve is inactive. |
Fault criteria:
| When voltage on the output is below 2.0 V for more than 1 s. |
Dependent:
System reaction to a fault:
| Torque limited to max. 170Nm. |
| Boost pressure adaption is blocked and reset. |
| Boost pressure control is blocked. |
| The system continues to function with a calculated air mass instead of the value from the mass air flow sensor. |
OK report:
| When fault criteria NOT fulfilled for 2 s. |
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:
| (See also description of readings/activations in diagnostic tool) |
