Output Diagnostic Test Mode (DTM)
- All functions which could previously be performed with V.A.G 1551 can also be performed with the tester VAS 5051.
- The pump motor and the correct functioning of the hydraulic circuits (allocation of brake lines to wheel cylinders and function of valves) can be checked via the output DTM for interchange or leaks.
- The vehicle must be raised until all wheels are free to turn. (2nd mechanic required to rotate wheels)
- The -C- key can be used to exit the test sequence at any time.
- After depressing the brake pedal several times the vacuum in the brake booster will be exhausted. Therefore more pressure must be applied to the brake pedal in order to attain the same fluid pressure in brake system, as that attained with vacuum.
- When vacuum in brake booster is exhausted wheels may not lock; start engine and build-up vacuum in brake booster.
Example:
Indicated on V.A.G 1551 display during output Diagnostic Test Mode (DTM):
(e.g. front left wheel, FL)
| Output Diagnostic Test Mode - → IFL: VBAT OFL: 0V Wheel FL locked |
IFL = Inlet valve Front Left
VBAT = Voltage Battery; Voltage at valve
OFL = Outlet valve Front Left
0V = 0 Volt; No voltage at valve
Locked/free = Wheel condition; must be checked by 2nd mechanic if required
| Output Diagnostic Test Mode - → EDL valves/Hyd-P: VBAT Wheel FL/FR locked |
Hydr-P = Hydraulic pump
- Connect V.A.G 1551 Scan Tool.
- Switch ignition on.
- Press key -1- for "Rapid data transfer" operating mode.
- Select brake electronics (address word 03);. Refer to V.A.G 1551 Scan Tool, connecting and selecting function
Indicated on display
| Rapid data transfer Q 03 - Brake electronics |
- Confirm entry with key Q.
- Read off control module version in V.A.G 1551 display.
- Press → key.
Indicated on display
| Rapid data transfer HELP Select function XX |
- Press keys 0 and 3
Indicated on display
| Rapid data transfer Q 03 - Output Diagnostic Test Mode |
- Confirm entry with key Q.
- ABS hydraulic pump -V64- must run.
Indicated on display
| Output Diagnostic Test Mode - → ABS hydraulic pump - V64 |
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → Operate brakes |
- Operate brake pedal.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → IFL: 0V OFL: 0V Wheel FL locked |
- Indicate to 2nd mechanic which wheel requires turning by hand.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → IFL: VBAT OFL: 0V Wheel FL locked |
- Press → key.
- ABS hydraulic pump -V64- must run.
- Brake pedal must not give.
If the brake pedal gives, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.
Refer to 45 ANTI-LOCK BRAKE SYSTEM ; Hydraulic unit, brake booster/brake master cylinder - Assembly overview; Removing and installing control module and hydraulic unit
Indicated on display
| Output Diagnostic Test Mode - → IFL: VBAT OFL: VBAT Wheel FL free |
- Indicate to 2nd mechanic which wheel requires turning by hand.
- Press → key.
- ABS hydraulic pump -V64- no longer runs.
Indicated on display
| Output Diagnostic Test Mode - → IFL: VBAT OFL: 0V Wheel FL free |
- Press → key.
- Brake pedal must give perceptibly
If the brake pedal does not give, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.
Refer to 45 ANTI-LOCK BRAKE SYSTEM ; Hydraulic unit, brake booster/brake master cylinder - Assembly overview; Removing and installing control module and hydraulic unit
Indicated on display
| Output Diagnostic Test Mode - → IFL: 0V OFL: 0V Wheel FL locked |
- Indicate to 2nd mechanic which wheel requires turning by hand.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → Release brakes |
- Remove foot from brake pedal.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → Operate brakes |
- Operate brake pedal.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → IFR: 0V OFR: 0V Wheel FR locked |
- Indicate to 2nd mechanic which wheel requires turning by hand.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → IFR: VBAT OFR: 0V Wheel FR locked |
- Press → key.
- ABS hydraulic pump -V64- must run.
- Brake pedal must not give
If the brake pedal gives, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.
Refer to 45 ANTI-LOCK BRAKE SYSTEM ; Hydraulic unit, brake booster/brake master cylinder - Assembly overview; Removing and installing control module and hydraulic unit
Indicated on display
| Output Diagnostic Test Mode - → IFR: VBAT OFR: VBAT Wheel FR free |
- Indicate to 2nd mechanic which wheel requires turning by hand.
- Press → key.
- ABS hydraulic pump -V64- no longer runs.
Indicated on display
| Output Diagnostic Test Mode - → IFR: VBAT OFR: 0V Wheel FR free |
- Press → key.
- Brake pedal must give perceptibly
If the brake pedal does not give, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.
Refer to 45 ANTI-LOCK BRAKE SYSTEM ; Hydraulic unit, brake booster/brake master cylinder - Assembly overview; Removing and installing control module and hydraulic unit
Indicated on display
| Output Diagnostic Test Mode - → IFR: 0V OFR: 0V Wheel FR locked |
- Indicate to 2nd mechanic which wheel requires turning by hand.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → Release brakes |
- Remove foot from brake pedal.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → Operate brakes |
- Operate brake pedal.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → IRL: 0V ORL: 0V Wheel RL locked |
- Indicate to 2nd mechanic which wheel requires turning by hand.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → IRL: VBAT ORL: 0V Wheel RL locked |
- Press → key.
- ABS hydraulic pump -V64- must run.
- Brake pedal must not give
If the brake pedal gives, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.
Refer to 45 ANTI-LOCK BRAKE SYSTEM ; Hydraulic unit, brake booster/brake master cylinder - Assembly overview; Removing and installing control module and hydraulic unit
Indicated on display
| Output Diagnostic Test Mode - → IRL: VBAT ORL: VBAT Wheel RL free |
- Indicate to 2nd mechanic which wheel requires turning by hand.
- Press → key.
- ABS hydraulic pump -V64 no longer runs.
Indicated on display
| Output Diagnostic Test Mode - → IRL: VBAT ORL: 0V Wheel RL free |
- Press → key.
- Brake pedal must give perceptibly
If the brake pedal does not give, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.
Refer to 45 ANTI-LOCK BRAKE SYSTEM ; Hydraulic unit, brake booster/brake master cylinder - Assembly overview; Removing and installing control module and hydraulic unit
Indicated on display
| Output Diagnostic Test Mode - → IRL: 0V ORL: 0V Wheel RL locked |
- Indicate to 2nd mechanic which wheel requires turning by hand.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → Release brakes |
- Remove foot from brake pedal.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → Operate brakes |
- Operate brake pedal.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → IRR: 0V ORR: 0V Wheel RR locked |
- Indicate to 2nd mechanic which wheel requires turning by hand.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → IRR: VBAT ORR: 0V Wheel RR locked |
- Press → key.
- ABS hydraulic pump -V64- must run.
- Brake pedal must not give
If the brake pedal gives, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.
Refer to 45 ANTI-LOCK BRAKE SYSTEM ; Hydraulic unit, brake booster/brake master cylinder - Assembly overview; Removing and installing control module and hydraulic unit
Indicated on display
| Output Diagnostic Test Mode - → IRR: VBAT ORR: VBAT Wheel RR free |
- Indicate to 2nd mechanic which wheel requires turning by hand.
- Press → key.
- ABS hydraulic pump -V64- no longer runs.
Indicated on display
| Output Diagnostic Test Mode - → IRR: VBAT ORR: 0V Wheel RR free |
- Press → key
- Brake pedal must give perceptibly
If the brake pedal does not give, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.
Refer to 45 ANTI-LOCK BRAKE SYSTEM ; Hydraulic unit, brake booster/brake master cylinder - Assembly overview; Removing and installing control module and hydraulic unit
Indicated on display
| Output Diagnostic Test Mode - → IRR: 0V ORR: 0V Wheel RR locked |
- Indicate to 2nd mechanic which wheel requires turning by hand.
- Press → key.
Indicated on display
| Output Diagnostic Test Mode - → Release brakes |
- Remove foot from brake pedal.
- Press → key.
Indicated on display (vehicles with EDL)
| Output Diagnostic Test Mode - → EDL valves/Hyd-P: VBAT Wh FL/FR locked |
If the wheels do not lock, there is a malfunction in the hydraulic part of the ABS system. In this case the hydraulic unit must be replaced.
Refer to 45 ANTI-LOCK BRAKE SYSTEM ; Hydraulic unit, brake booster/brake master cylinder - Assembly overview; Removing and installing control module and hydraulic unit
- Press → key.
- The ABS warning light -K47- goes out.
Indicated on display
| Function is unknown or → cannot be carried out at the moment |
The Output Diagnostic Test Mode (DTM) is completed
- Press → key.
Indicated on display
| Rapid data transfer HELP Select function XX |
- There is a malfunction in the system if the ABS warning light -K47- does not go out.
- Adhere exactly to test sequence: First check Diagnostic Trouble Code (DTC) memory, then erase.
- End output (Function 06). Refer to Diagnostic Trouble Code (DTC) memory, erasing and ending output .