E39 / P2261 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Malfunction Indicator Lamp
Turbocharger Bypass Valve, Mechanical Failure
Fault symptom
Malfunction Indicator Lamp
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Battery voltage must be between 10 - 18 V. |
| Engine speed more than 1500 rpm. |
| The following diagnostic trouble codes may not be generated: |
Fault criteria:
| Bypass valve stuck in closed position. Pulsation in intake manifold during engine braking (when valve should open) is higher than calibrated value. Value based on actual and modelled air mass (throttle position and boost pressure). |
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
Functions in the diagnostic tool related to the fault:
| • | Charge Air Bypass Solenoid |
| • | Charge Air Bypass Solenoid |
| (See also description of readings/activations in diagnostic tool) |
