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Octavia Mk1

Actuator diagnosis
Actuator diagnosis
Special tools and workshop equipment required
t  Vehicle system tester -V.A.G 1552-
t  Diagnostic cable -V.A.G 1551/3-
The final control diagnosis is a part of the electrical test. The final control diagnosis is used to test the pump motor, it is also used to check the correct operation of the hydraulic circuits (assignment of brake pressure lines to the wheel brakes, and also the operation of the valves) to ensure they are correctly connected and are not leaking.
  Note
t  The vehicle must be raised so that the wheels are clear of the ground (2nd mechanic required for rotating the wheels).
t  It is possible to quit the test sequence at any time by pressing key -C-.
t  After depressing the brake pedal several times, the vacuum in the brake servo unit is reduced. Greater effort is then required to operate the brake pedal in order to achieve the same fluid pressure in the brake system as with vacuum assistance.
t  Once the vacuum in the brake servo unit has been reduced, it is possible that the wheels do not lock ⇒ start engine in order to build up vacuum in the brake servo unit.
t  Operate the vehicle system tester by referring to the read-out on the display.
Example:
Read-out on display of vehicle system tester -V.A.G 1552- during the final control diagnosis
   
(e.g. front left wheel, FL)
IFL = Inlet valve front left
VBAT = V-Battery voltage, voltage present on valve
OFL = Outlet valve front left
0V = 0 Volt; no voltage on valve
  
Final control diagnosis            -  ->
IFL:VBAT  OFL:0V Wheel FL locked
locked/free = Wheel status; must be checked by 2nd mechanic
Hydr-P = Hydraulic pump
Performing actuator diagnosis
–  Connect the vehicle system tester -V.A.G 1552- and enter the address word 03 „brake electronics“ with the ignition switched on → Chapter.
–  Release the hand-brake.
  
Final control diagnosis            -  ->
EDL valves/Hydr.p: VBAT Wheel FL/FR block
Readout on display:
–  Enter 03 for the function „Actuator diagnosis“.
  
Vehicle system test               HELP
Select function XX
Readout on display:
–  Confirm the entry with key Q
The ABS hydraulic pump -V64- must run.
  Note
During the next work steps, the ABS warning light flashes 2 times and the hand brake/brake fluid level warning light flashes 4 times per second.
  
Vehicle system test                Q   
03-Actuator diagnosis
Readout on display:
–  Press the → button within the next 60 seconds.
  
Final control diagnosis            -  ->
Hydraulic pump ABS -V64
Readout on display:
–  Actuate brake pedal.
–  Press → key.
  
Final control diagnosis            -  ->
Operate brake
Readout on display:
–  Instruct the 2nd mechanic to rotate the relevant wheel by hand.
If the wheel does not lock, it is possible that there is a fault in the mechanical/hydraulic part of the brake system.
–  Press → key.
  
Final control diagnosis            -  ->
IFL: 0V OFL: 0V  Wheel FL locked
Readout on display:
–  Press → key.
The ABS hydraulic pump -V64- must run
Brake pedal must not yield.
If the brake pedal yields, there is a fault in the hydraulic unit. If this is the case replace the hydraulic unit → Chapter.
  
Final control diagnosis            -  ->
IFL: 0V OFL: 0V  Wheel FL locked
Readout on display:
–  Instruct the 2nd mechanic to rotate the relevant wheel by hand.
If the wheel does not lock, it is possible that there is a fault in the mechanical/hydraulic part of the brake system.
–  Press → key.
ABS hydraulic pump -V64- no longer runs
  
Final control diagnosis            -  ->
IFL: 0V OFL: VBAT Wheel FL free
Readout on display:
–  Press → key.
Brake pedal must be felt to yield.
If the brake pedal does not yield, there is a fault in the hydraulic unit. If this is the case replace the hydraulic unit → Chapter.
  
Final control diagnosis            -  ->
IFL: 0V OFL: 0V  Wheel FL free
Readout on display:
–  Instruct the 2nd mechanic to rotate the relevant wheel by hand.
If the wheel does not lock, it is possible that there is a fault in the mechanical/hydraulic part of the brake system.
–  Press → key.
  
Final control diagnosis            -  ->
IFL: 0V OFL: 0V  Wheel FL locked
Readout on display:
–  Take your foot off the brake pedal.
–  Press → key.
  
Final control diagnosis            -  ->
Release brake
Readout on display:
–  Actuate brake pedal.
–  Press → key.
  
Final control diagnosis            -  ->
Release brake
Readout on display:
–  Press → key.
The ABS hydraulic pump -V64- must run.
Brake pedal must not yield.
If the brake pedal yields, there is a fault in the hydraulic unit. If this is the case replace the hydraulic unit → Chapter.
  
Final control diagnosis            -  ->
IFR: 0V OFR: 0V Wheel FR locked
Readout on display:
–  Press → key.
Brake pedal must be felt to yield.
If the brake pedal yields, there is a fault in the hydraulic unit. If this is the case replace the hydraulic unit → Chapter.
  
Final control diagnosis            -  ->
IFR: 0V OFR: 0V Wheel FR free
Readout on display:
–  Instruct the 2nd mechanic to rotate the relevant wheel by hand.
If the wheel does not lock, it is possible that there is a fault in the mechanical/hydraulic part of the brake system.
–  Press → key.
  
Final control diagnosis            -  ->
IFR: 0V OFR: 0V Wheel FR locked
Readout on display:
–  Take your foot off the brake pedal.
–  Press → key.
  
Final control diagnosis            -  ->
Release brake
Readout on display:
–  Actuate brake pedal
–  Press → key.
  
Final control diagnosis            -  ->
Operate brake
Readout on display:
–  Instruct the 2nd mechanic to rotate the relevant wheel by hand.
If the wheel does not lock, it is possible that there is a fault in the mechanical/hydraulic part of the brake system.
–  Press → key.
  
Final control diagnosis            -  ->
IRL:0V ORL:0V    Wheel RL locked
Readout on display:
–  Press → key.
The ABS hydraulic pump -V64- must run.
Brake pedal must not yield.
If the brake pedal yields, there is a fault in the hydraulic unit. If this is the case replace the hydraulic unit → Chapter.
  
Final control diagnosis            -  ->
IRL:VBAT ORL:0V    Wheel RL locked
Readout on display:
–  Instruct the 2nd mechanic to rotate the relevant wheel by hand.
If the wheel locks, it is possible that the brake pressure lines to the wheel brakes are wrongly connected.
–  Press → key.
ABS hydraulic pump -V64- no longer runs.
  
Final control diagnosis            -  ->
IRL:VBAT ORL:VBAT    Wheel RL free
Readout on display:
–  Press → key.
Brake pedal must be felt to yield.
If the brake pedal does not yield, there is a fault in the hydraulic unit. If this is the case replace the hydraulic unit → Chapter.
  
Final control diagnosis            -  ->
IRL:VBAT ORL:0V    Wheel RL free
Readout on display:
–  Instruct the 2nd mechanic to rotate the relevant wheel by hand.
If the wheel does not lock, it is possible that there is a fault in the mechanical/hydraulic part of the brake system.
–  Press → key.
  
Final control diagnosis            -  ->
IRL:0V ORL:0V    Wheel RL locked
Readout on display:
–  Take your foot off the brake pedal.
–  Press → key.
  
Final control diagnosis            -  ->
Release brake
Readout on display:
–  Actuate brake pedal
–  Press → key.
  
Final control diagnosis            -  ->
Operate brake
Readout on display:
–  Instruct the 2nd mechanic to rotate the relevant wheel by hand.
If the wheel does not lock, it is possible that there is a fault in the mechanical/hydraulic part of the brake system.
–  Press → key.
  
Final control diagnosis            -  ->
IRR:0V ORR:0V    Wheel RR locked
Readout on display:
–  Press → key.
The ABS hydraulic pump -V64- must not run.
Brake pedal must not yield.
If the brake pedal yields, there is a fault in the hydraulic unit. If this is the case replace the hydraulic unit → Chapter.
  
Final control diagnosis            -  ->
IRR:VBAT ORR:0V    Wheel RR locked
Readout on display:
–  Instruct the 2nd mechanic to rotate the relevant wheel by hand.
If the wheel locks, it is possible that the brake pressure lines to the wheel brakes are wrongly connected.
–  Press → key.
ABS hydraulic pump -V64- no longer runs.
  
Final control diagnosis            -  ->
IRR:VBAT ORR:VBAT    Wheel RR free
Readout on display:
–  Press → key.
Brake pedal must be felt to yield.
If the brake pedal does not yield, there is a fault in the hydraulic unit. If this is the case replace the hydraulic unit → Chapter.
  
Final control diagnosis            -  ->
IRR:VBAT ORR:0V    Wheel RR free
Readout on display:
–  Instruct the 2nd mechanic to rotate the relevant wheel by hand.
If the wheel does not lock, it is possible that there is a fault in the mechanical/hydraulic part of the brake system.
–  Press → key.
  
Final control diagnosis            -  ->
IRR:0V ORR:0V    Wheel RR locked
Readout on display:
–  Take your foot off the brake pedal.
–  Press → key.
  
Final control diagnosis            -  ->
Release brake
Read-out on display: (for vehicles with EDL)
–  Instruct the 2nd mechanic to rotate the relevant wheel by hand.
If the wheels do not lock, there is a fault in the hydraulic part of the ABS system. If this is the case replace the hydraulic unit → Chapter.
–  Press → key.
The ABS warning light -K47- goes out.
  
Final control diagnosis            -  ->
EDL valves/ Hydr.p:VBAT Wheel FL/FR block.
Readout on display:
  Note
The final control diagnosis is completed
–  Press → key.
  
Function unknown or cannot        -  -> 
be carried out at the moment
Readout on display:
  Note
t  If the ABS warning light does not go out, there is a fault in the system.
t  Carefully follow the test sequence step by step: first interrogate the fault memory, then erase.
–  Ending output → Chapter.
  
Vehicle system test               HELP
Select function XX

Basic setting > < Reading measured value block