Timing Components: Testing and Inspection
System test, initiating
Special tools and equipment
^ VAS5051 Vehicle diagnosis, testing and information system with VAG5051/1 Adapter
WARNING!
^ Test equipment must always be secured to the rear seat and operated from there by a second person.
^ If test and measuring equipment is operated from the passenger seat, the person seated there could be injured in the event of an accident involving deployment of the passenger-side airbag.
Requirements
^ VAS5051 tester connected and vehicle On Board Diagnostic (OBD) -01 Engine electronics- selected.
^ Coolant Temperature at least 80 ° C.
^ Vehicles with automatic transmission selector lever in P or N.
Work sequence
- Start engine, and let run at idle.
Display on VAS5051:
- In selection -1-, click on the diagnostic function "04 - Basic setting".
Display on VAS5051:
1 - Enter display group
max. input value = 255
- Select function "094" in button field -2- for "display group number 094" and press Q button to confirm input.
Display on VAS5051:
- Activate basic setting by pressing button A.
- Depress accelerator pedal and brake pedal at same time; engine speed increases to approx. 1900 RPM.
Requirement
^ Accelerator pedal and brake pedal depressed at same time, engine runs at approx. 1900 RPM.
- Check specified values in display fields -3- and -4-.
- Click on < button
Display on VAS5051:
1 - Enter display group
max. input value = 255
- Select function "096" in button field -2- for "display group number 096" and press Q button to confirm input.
Indicated on display of VAS 5051:
- Activate basic setting by pressing button -A-.
- Depress accelerator pedal and brake pedal at same time, engine speed increases to approx. 1900 RPM.
Requirement
^ Accelerator pedal and brake pedal depressed at the same time, engine runs at approx. 1900 RPM.
- Check specified values in display fields -3- and -4-.
- Click on < button.
- Switch over to Read measured value block.
Camshaft adjustment (exhaust), checking
Indicated on display of VAS 5051:
1 - Enter display group: max. input value = 255
- Select function "090" in button field -2- for "display group number 090" and press Q button to confirm input.
Indicated on display of VAS 5051:
Requirement
^ Engine running at idle.
- Check specified values in display fields -2-, -3- and -4-.
- Perform a road test.
- Accelerate vehicle in 3rd gear at wide open throttle from 2000 RPM.
- Check specified values in display fields -2-, -3- and -4-.
Note: If display field indicates a value between 3.0 ° crankshaft rotation and 19.0 ° crankshaft rotation during a road test, the electrical valve for camshaft adjustment is correctly switching the oil pressure to mechanical camshaft adjuster, but the mechanical camshaft adjuster cannot reach its end position (e.g. due to difficulty of movement).
Camshaft adjustment (intake), checking
Indicated on display of VAS 5051:
- Press s button to change into display group 091.
Requirement
^ Engine running at idle.
- Check specified values in display fields -3- and -4-.
- Perform a road test.
- Accelerate vehicle in 3rd gear at wide open throttle from 2000 RPM.
- Check specified values in display fields -3- and -4-.
Note: If display field only indicates a value between 3.0 ° crankshaft rotation and 39.0 ° crankshaft rotation during a road test, the electrical valve for camshaft adjustment is correctly switching the oil pressure to mechanical camshaft adjuster, but the mechanical camshaft adjuster cannot reach its end position (e.g. due to difficulty of movement).
Indicated on display of VAS 5051:
- Press s button to change into display group 092.
Requirement
^ Engine running at idle.
- Check specified values in display fields -3- and -4-.
- Perform a road test.
- Accelerate vehicle in 3rd gear at wide open throttle from 2000 RPM.
- Check specified values in display fields -3- and -4-.
Note: If display field only indicates a value between 3.0 ° crankshaft rotation and 39.0 ° crankshaft rotation during a road test, the electrical valve for camshaft adjustment is correctly switching the oil pressure to mechanical camshaft adjuster, but the mechanical camshaft adjuster cannot reach its end position (e.g. due to difficulty of movement).