Vacuum Pump: Testing and Inspection
Brake System Vacuum Pump Checking
Special tools, testers and auxiliary items required
• Vehicle diagnostic, testing and information system ( VAS 5051)
• Diagnosis lead (VAS 5051/1) or diagnosis lead (VAS 5051/3)
Procedure
- With the ignition switched off, connect the vehicle diagnostic, testing and information system (VAS 5051) to the diagnostic connection with diagnosis lead (VAS 5051/1) or diagnosis lead (VAS 5051/3).
- Switch on the tester - arrow -.
The tester may need up to 3 minutes before it is ready for operation.
- Switch on the ignition.
- Select mode: Press button on display for "Vehicle self-diagnosis ".
- Select vehicle system: Press button for "01 - Engine electronics ".
The control module identification and coding will appear at top right of display.
- Select diagnosis function (all diagnosis functions are available at this stage).
- Select "04 - Basic setting" on display.
- Press buttons 0, 0 and 8.
- Confirm entry with Q key.
The following information will appear at the bottom of the display:
- Firmly depress the brake pedal several times in succession until test is activated.
The following information will appear at the bottom of display:
Do not press the brake pedal again once test has been activated.
The brake system vacuum pump (V192) supplies vacuum to the brake booster. The diagnosis of the brake booster system runs in the control module at the same time.
The system passes the test if the pressure in the brake booster reaches the shutoff threshold within the time limit set by the diagnostic function.
The following information will appear at the bottom of display:
- You can cancel or exit from this mode by pressing the Go to button.
The system fails the test if pressure in brake booster does not reach the shutoff threshold within time limit set by the diagnostic function.
The following information will appear at the bottom of display:
- Follow the "Guided Fault Finding" procedure using vehicle diagnostic, testing and information system (VAS 5051 ).