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Low engine power output / little movement on the turbo pressure gauge and rattling from the turbocharger.

Symptom: Low engine power output / little movement on the turbo pressure gauge Rattling from turbocharger CHECK ENGINE lamp on Diagnostic trouble code P1105

Low engine power output / little movement on the turbo pressure gauge and rattling from the turbocharger.

Fault symptoms

Low engine power output / little movement on the turbo pressure gauge

Rattling from turbocharger

CHECK ENGINE lamp on

Diagnostic trouble code P1105

Conditions

On certain cars, the clip holding the turbocharger pushrod to the arm on the wastegate valve can come loose. If the clip does come loose, the pushrod can slide off the pin on the wastegate valve arm. As a result, boost pressure control will not function and the valve disc will cause a rattling noise from the turbocharger.

Diagnostic help

Additional help for fault diagnosis

Checking the wiring

The standardised text below can be used here if necessary:

Jiggle the wiring harness at several points and in different directions to reveal intermittent breaks and short-circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic instrument while doing this.

Diagnostic procedure




1. Undo the hose clip on the charge air pipe and the screw on the bypass pipe. Move aside the bypass pipe.

Warning

The exhaust pipe from the turbocharger can be extremely hot. Proceed with caution.



2. Remove the heat shield.

3. Carefully knock repeatedly with a screwdriver to get the throttle arm back to its original position (anticlockwise). Note that the throttle arm must not be turned with pliers or the like as it can break or bend.

Important

The throttle arm must not be twisted with pliers or similar as the arm can break or distort.



4. If the throttle arm does not return to its original position using the method above, unplug the oxygen sensor connector and remove the primary catalytic converter or disconnect the front exhaust pipe from the turbocharger. Otherwise, only perform steps 8, 10 and 11.

5. Press the tip of a screwdriver against the top right part of the throttle disc while pressing in the throttle spindle and raising the throttle arm by hand.


6. Press the tip of a screwdriver against the throttle disc while pressing in the throttle spindle and turning the throttle arm further to pass the edge of the exhaust turbine.


7. If it is difficult to pass this edge, carefully file down the edge that hinders the throttle disc with a round file. Check that the throttle disc is not damaged.


8. Connect the arm to the pushrod and secure it with the new clip specified above.

9. Fit the primary catalytic converter and plug in the oxygen sensor or fit the front exhaust pipe. Grease the studs with 30 20 971 Screw thread paste .

Tightening torque 24 Nm (18 lbf ft)

10. Fit the heat shield.

11. Fit the bypass pipe using a new O-ring.