Point Health Check:
6. Check for loose or broken turbine and compressor housing fasteners. If mounting flanges are damaged, replace or tighten
(torque to manufacturer's specification):
Legend
- 1. Boost pressure actuator
- 2. Actuator arm
- 3. Low flow adjusting screw
- 4. Actuator heel
- 5. Compressor casing
7. Stage 3: Vacuum Actuation:
- 1. Check for correct installation of boost pressure actuator and check for loose bolts etc. If unsure, check and compare with
another vehicle
- 2. Check for DTCs and rectify fault before moving to next step
-
• NOTE: If the actuator arm is stuck in the open vane position, check solenoid for correct operation
3. Check/observe actuator arm movement during key ON/OFF calibration
- 3. Start Engine and allow to idle: Actuator (2) will retract under smooth operation and rest on the low flow adjuster screw at
idle (3) – Turbocharger vanes closed
- 4. Key off: Actuator will retract to the fully open position – Turbocharger vanes fully open
- 5. If the above is not observed, check vacuum supply to boost pressure actuator (1)
- Check system: Utilizing Vacuum Gauge
- 6. Remove hose from actuator and apply a clean regulated vacuum of 47cmHg to the actuator (using a suitable hand-held
vacuum pump) - check for smooth actuator movement, and that the actuator heel rests on the low-flow adjusting screw
- 7. The boost pressure actuator (1) should hold a vacuum of 47cmHg for 20 seconds; if not, replace the turbocharger
- 8. Release the vacuum from regulator, and the actuator should snap open under the boost pressure actuator spring force
(default fully opens the vanes). If not, replace turbocharger