Pressure Cell With Charge Pressure Actuator Position Sensor, Replacing
Special tools and workshop equipment required
- Multipoint socket T10422
- Open end wrench T10423
- Vehicle diagnostic tester
The specified special tools, in particular the T10422, are designed exclusively for use according to the following work procedure and may not be used for other bolt connections. Higher torques can cause deformation.
A replacement part kit is available for the replacement of the pressure cell with the charge pressure actuator position sensor -G581-.
Removing
-- Remove the air filter housing with the mass air flow sensor and connecting pipe. Refer to Removal and Installation .
-- Press the release buttons and remove the crankcase ventilation connecting pipe -1- from the cylinder head cover.
-- Expose the vacuum hoses -arrows-.
-- Remove bolt -2- (cannot be lost) and tilt the air guide pipe with the intake tube backward and remove from the turbocharger.
-- Seal the opening on the turbocharger with the cap from the replacement part kit.
-- Remove the heat shield boot around the connector -1-.
-- Disconnect the connector -1- on the charge pressure actuator position sensor.
-- Remove the vacuum hose -2- from the turbocharger vacuum diaphragm.
-- Depending on the version, remove the securing nut -arrow- of the oil supply line/vacuum line connection on the cylinder head.
- A = 110 mm
- B = 25 mm
When disconnecting the oil supply line, the connection fitting must be counter-held. Risk of consequential damage.
-- Counter-hold the connection fitting with the open-end wrench and remove the oil supply line -arrow- on the turbocharger.
-- Seal the oil supply opening on the turbocharger with the plug from the replacement part kit.
-- Counter-hold lock nut -B- with the T10423 and remove securing nut -A- with the T10422 from the control rod.
-- Remove the securing bolts of the pressure cell -arrows- and remove pressure cell -A-.
Installing
Only use new bolts and nuts from the replacement part kit.
-- Remove the lower securing nut of the control rod from the new pressure cell if applicable.
-- Screw the lock nut onto the control rod by hand to the stop in the direction of the pressure cell.
-- Conduct the control rod through the adjustment lever on the turbocharger, install pressure cell -A-, and insert the fastening bolts.
-- Tighten the fastening bolts -arrows- to 8 Nm.
Ensure that the guide piece moves easily on the control rod.
-- Remove the protective cap, install the oil supply line -arrow- on the turbocharger, and tighten to 22 Nm.
-- Connect the connector -2- to the charge pressure actuator position sensor -G581- and connect the heat shield.
-- Connect the tester.
Selecting Operating Mode
-- Press the OBD button on the screen.
Selecting Vehicle System
-- Press the 01 - engine electronics button on the display.
The display shows the control module identification and the coding for the engine control module.
Selecting Diagnosis Function
-- Press the 011 - measured values button on the display.
-- Enter measured value block 120 via the 10-key keyboard and confirm the entry with the Q button.
-- Connect the hand vacuum pump VAS 6213 to the pressure cell.
-- Set a voltage of 0.760 V by generating a vacuum while observing the lowest value of the measured value block.
Maintain a constant vacuum and voltage of 0.706 V during the subsequent adjustment procedure for the control rod.
-- Slowly screw lock nut -B- of the control rod down by hand. The adjustment lever is on the lower stop.
-- Counter-hold lock nut -B- and turn securing nut -A- on the control rod against the adjustment lever. Tighten slightly with the T10423.
-- Release the vacuum pressure from the pressure cell.
-- Observe the lowest value of the measured value block. With no pressure, a value of 3.30-3.90 V must be set.
-- Attach the T10422, counter-hold lock nut -B- with the T10423 and tighten securing nut -A-.
Generate a vacuum of 0.75 ± 0.05 bar at the vacuum cell to ensure that the adjustment lever is at the stop. A voltage of 0.760 V must be set in this process.
Voltage Value OK
-- Manually press the securing plate onto the control rod and turn it 90° in direction of -arrow-.
-- Seal the control rod/securing nut connection with sealing wax from the replacement part kit.
Voltage Value Not OK
-- Counter-hold lock nut -B-, loosen securing nut -A- of the control rod, and correct the value by rotating lock nut -B-.
-- Counter-hold lock nut -B-, counter-rotate securing nut -A-, and tighten with the T10422.
-- Manually press the securing plate onto the control rod and turn it 90° in direction of -arrow-.
-- Seal the control rod/securing nut connection with sealing wax from the replacement part kit.
Continued
-- Install the nut -arrow- on the oil supply line/vacuum line connection on the cylinder head and tighten it.
-- Remove the cover on the turbocharger.
-- Reassemble the engine.
-- Start the engine and erase the DTC memory
-- Check the setting as follows:
Selecting Diagnosis Function
-- Press the 006 - basic setting button on the display.
-- Enter measured value block 120 via the 10-key keyboard and confirm the entry with the Q button.
-- Press the activate button on the lower half of the screen.
-- Observe the value in the lower window. It must fluctuate between 0.65-0.85 V and 3.30-3.90 V (pressure cell alternates between the two end positions).
If the voltage values are OK:
-- End the basic setting.