2.0L (Engine Code Aba) - Readiness Code Creating (GROUP 01, NO. 96-02)

Publication date: 1996-02-14
Reference number: GROUP 01, NO. 96-02

TEVES 20 GI ABS & ABS/EDL ON BOARD DIAGNOSTIC

TECHNICAL SERVICE BULLETIN

Reference Number(s): GROUP 01, NO. 96-02, Date of Issue: June 24, 1996

ANTI-LOCK BRAKES - TEVES 20 GI ABS & ABS/EDL - ON BOARD DIAGNOSTIC

Model(s): 1995-on Volkswagen Golf, GTI, Jetta, Cabrio Built From 02/95 Group: 01 - On-Board Diagnostic

Bulletin No.: 96-02

Date: June 24, 1996

NOTE: File this Technical Bulletin in Repair Manual No.: W42 011 294 112A.

SERVICE INFORMATION

The following Repair Manual information has been revised and will be integrated with the next Repair Manual update.

This information replaces pages 01-111 through 01-130, and revise page 01-139 in the current version Repair Manual, ABS & ABS/EDL On Board Diagnostic (W42 011 294 112A).

TEVES 20 GI ABS AND ABS/EDL ON BOARD DIAGNOSTIC (OBD)

READ MEASURING VALUE BLOCK VAG 1551 SCAN TOOL FUNCTION 08

The ABS control module can transfer a considerable amount of test data. This data delivers information about the operational condition of the system and/or sensors. In many cases the transferred test data provides support for troubleshooting and repair. The test data has been summarized into single display groups because all the information cannot be evaluated at the same time. The information can be selected via display group numbers.

Connect VAG 1551 scan tool and select "Brake Electronics" address word 03 with ignition switched on.

Display will show the following:

Fig 1: SCREEN 1

Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.

Display will show the following:

Fig 2: SCREEN 2

Press -Q- button to confirm input.

DISPLAY GROUP 001 - ABS WHEEL SPEED SENSOR ASSIGNMENT

Display will show the following:

Fig 3: SCREEN 3

Press buttons -0-, -0- and -1- (display group 001).

Press -Q- button to confirm input.

Display will show the following (vehicle not moving):

Fig 4: SCREEN 4

Momentary actual wheel speed is displayed. These are used to check the ABS wheel speed sensor assignments to the wheels. (Vehicle must be raised and wheel turned by hand).

In "Read Measuring Value Block" function 08 there are always 4 display fields (arrows -1- through -4-).

Fig 5: SCREEN 5

WHEEL SPEED

Display Field

Description

⁽¹⁾ Displayed on VAG 1551 Scan Tool

Wheel speed, left front - km/h

0 - 255

Wheel speed, right front - km/h

0 - 255

Wheel speed, left rear - km/h

0 - 255

Wheel speed, right rear - km/h

0 - 255

⁽¹⁾	A second technician is required to read the values.

Press -C- button.

DISPLAY GROUP 002 - ABS WHEEL SPEED SENSOR SIGNALS

The ABS control module stores the first useable voltage signal from he ABS wheel speed sensors when driving away, and displays these as set values in the measured value block.

In "Read Measuring Value Block" function 08 there are always 4 display fields (arrows -1- through -4-).

Fig 6: SCREEN 6

Values in display fields 1 and 2 must not be greater than 6 km/h (approx. 3-1/2 mph).

Values in display fields 3 and 4 must not be greater than 2 km/h (approx. 1-1/4 mph).

Displayed values greater than these may be caused by faulty ABS wheel speed sensor installation:

Air gap too large between ABS wheel speed sensor and impulse rotor (check for correct installation in wheel bearing housings).
External damage to ABS wheel speed sensor or impulse rotor replace damaged part).

Display will show the following:

Fig 7: SCREEN 7

Press buttons -0-, -0- and -2- (display group 002).

Press -Q- button to confirm input.

Display will show the following (vehicle not moving):

Fig 8: SCREEN 8

Drive away slowly until values are displayed on VAG 1551 scan tool.

WHEEL SPEED

Display Field	Description	Displayed On VAG 1551 Scan Tool
1	Wheel speed, left front - km/h	2 - 255
2	Wheel speed, right front - km/h	2 - 255
3	Wheel speed, left rear - km/h	0 - 255
4	Wheel speed, right rear - km/h	0 - 255

Deviations in values in display fields 1 and 2 below 6 km/h (approx. 3-1/2 mph) are OK (see example below).

Deviations in values in display fields 3 and 4 below 2 km/h (approx. 1-1/4 mph) are OK (see example below).

EXAMPLE: Display shows the following (driving away slowly):

Fig 9: SCREEN 9

Press-C- button.

DISPLAY GROUP 003 - BRAKE LIGHT SWITCH ABS AND ABS/EDL FUNCTION

Display will show the following:

Fig 10: SCREEN 10

Press buttons -0-, -0- and -3- (display group 003).

Press -Q- button to confirm input.

Display will show the following:

Fig 11: SCREEN 11

BRAKE TEST

Display Field	Test Requirements	Displayed on VAG 1551 Scan Tool
1	Foot brake not operated	0
---	Foot brake operated	1

OUTPUT DIAGNOSTIC TEST MODE (DTM) (VAG 1551 SCAN TOOL FUNCTION 03)

The output diagnostic test mode is part of the ABS electrical test. The ABS pump motor and the functioning of the hydraulic circuits (brake line connections to wheel brake calipers; valve functions) can be checked for leaks or for incorrect connections using the output diagnostic test mode.

NOTE: * The vehicle must be raised until all wheels are free to turn. (second technician required to rotate wheels).

The -C- button can be used to exit the test sequence at any time.
After depressing the brake pedal several times the vacuum in the brake servo 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 the vacuum for the brake servo is exhausted it can lead to a situation in which the wheels do not lock; start the engine and build-up vacuum in the brake servo.

Example: Indicated on VAG 1551 scan tool display during the output diagnostic test mode (Example: left-front wheel, FL):

Fig 12: SCREEN 12

IFL = Inlet valve Front Left

VBAT = Voltage Battery; voltage at valve

OFL = Outlet valve Front Left

0V = 0 Volts; no voltage at valve

Locked/free = Wheel condition

CAUTION: Wheel condition "locked" or "free" must be checked and verified by a second technician.

Fig 13: SCREEN 13

Hydr-P = Hydraulic Pump

Release parking brake.

Connect VAG 1551 scan tool, switch ignition on, and select "Brake Electronics" address word 03.

See Repair Manual, ABS & ABS/EDL On Board Diagnostic, Repair Group 01, VAG 1551 Scan Tool, connecting and selecting function.

Display will show the following:

Fig 14: SCREEN 14

Press buttons -0- and -3- to select "Output Diagnostic Test Mode" function 03.

Display will show the following:

Fig 15: SCREEN 15

Press -Q- button to confirm input.

NOTE: During the work sequence that follows, the ABS warning light flashes 2 times per second and the brake system warning flashes 4 times per second.

ABS hydraulic pump -V64- must run.

Display will show the following:

Fig 16: SCREEN 16

Press --> button within next 60 seconds.

Display will show the following:

Fig 17: SCREEN 17

Press brake peal and hold.

Press --> button.

Display will show the following:

Fig 18: SCREEN 18

Press --> button.

Display will show the following:

Fig 19: SCREEN 19

Press --> button.

ABS hydraulic pump -V64- must run.
Brake pedal must not give.

Display will show the following:

Fig 20: SCREEN 20

Press --> button.

ABS hydraulic pump -V64- stops running.

Display will show the following:

Fig 21: SCREEN 21

Press --> button.

Brake pedal must give perceptibly.

Display will show the following:

Fig 22: SCREEN 22

Press --> button.

Display will show the following:

Fig 23: SCREEN 23

Release brake pedal.

Press --> button.

Display will show the following:

Fig 24: SCREEN 24

Press brake pedal and hold.

Press --> button.

Display will show the following:

Fig 25: SCREEN 25

Press --> button.

Display will show the following:

Fig 26: SCREEN 26

Press --> button.

ABS hydraulic pump -V64- must run.
Brake pedal must not give.

Display will show the following:

Fig 27: SCREEN 27

Press --> button.

ABS hydraulic pump -V64- stops running.

Display will show the following:

Fig 28: SCREEN 28

Press --> button.

Brake pedal must give perceptibly.

Display will show the following:

Fig 29: SCREEN 29

Press --> button.

Display will show the following:

Fig 30: SCREEN 30

Release brake pedal.

Press --> button.

Display will show the following:

Fig 31: SCREEN 31

Press brake pedal and hold.

Press --> button.

Display will show the following:

Fig 32: SCREEN 32

Press --> button.

Display will show the following:

Fig 33: SCREEN 33

Press --> button.

ABS hydraulic pump -V64- must run.
Brake pedal must not give.

Display will show the following:

Fig 34: SCREEN 34

Press --> button.

ABS hydraulic pump -V64- stops running.

Display will show the following:

Fig 35: SCREEN 35

Press --> button.

Brake pedal must give perceptibly.

Display will show the following:

Fig 36: SCREEN 36

Press --> button.

Display will show the following:

Fig 37: SCREEN 37

Release brake pedal.

Press --> button.

Display will show the following:

Fig 38: SCREEN 38

Press brake pedal and hold.

Press --> button.

Display will show the following:

Fig 39: SCREEN 39

Press --> button.

Display will show the following:

Fig 40: SCREEN 40

Press --> button.

ABS hydraulic pump -V64- must run.
Brake pedal must not give.

Display will show the following:

Fig 41: SCREEN 41

Press --> button.

ABS hydraulic pump -V64- stops running.

Display will show the following:

Fig 42: SCREEN 42

Press --> button.

Brake pedal must give perceptibly.

Display will show the following:

Fig 43: SCREEN 43

Press --> button.

Display will show the following:

Fig 44: SCREEN 44

Release brake pedal.

Press --> button.

Display will show the following:

Fig 45: SCREEN 45

Press --> button.

ABS warning light and brake system warning light go out.

Display will show the following:

Fig 46: SCREEN 46

The output diagnostic test mode is completed.

Press --> button.

Display will show the following:

Fig 47: SCREEN 47

NOTE: * If the ABS warning light does no go out often there is a malfunction in the system.

Adhere exactly to the test sequence: First check DTC memory, then erase.

End output (VAG 1551 Scan Tool function 06).

See Repair Manual, ABS & ABS/EDL On Board Diagnostic, Repair Group 01, Diagnostic Trouble Code (DTC) memory, erasing and ending output.

ABS/EDL HYDRAULIC UNIT, BLEEDING USING BASIC SETTING VAG 1551 SCAN TOOL FUNCTION 04)

On vehicles with EDL, "Basic Setting" function 04 is used to bleed the ABS hydraulic unit. Use of the "Basic Setting" function for bleeding is only necessary when at least one brake fluid reservoir is completely empty (e.g. leaks in brake system).

WARNING: * Make sure that filling/bleeding pressure does not exceed 1 bar approx. 14-12 psi when using a pressure bleeder.

For this reason, operating pressure on some filler/bleeder units must be reduced to 1 bar. See operating instructions.
If the filling/bleeding pressure exceeds 1 bar, there is no guarantee that the ABS hydraulic unit is adequately bled.

Connect brake system filler/bleeder unit.

Connect VAG 1551 scan tool, switch ignition on, and select "Brake Electronics" address word 03.

See Repair Manual, ABS & ABS/EDL On Board Diagnostic, Repair Group 01, VAG 1551 Scan Tool, connecting and selecting function.

Display will show the following:

Fig 48: SCREEN 48

Press buttons -0- and -4- to select "Basic Setting" function 04.

Display will show the following:

Fig 49: SCREEN 49

Press -Q- button to confirm input.

Display will show the following:

Fig 50: SCREEN 50

Press buttons -0-, -0- and -1- to input display group 001, then press -Q- button to confirm input.

Display will show the following:

Fig 51: SCREEN 51

Release brake pedal.

Open left-front and right-front bleeder screws.

Press -3- button.

Display will show the following:

Fig 52: SCREEN 53

ABS hydraulic pump runs.

Display will show the following:

Fig 53: SCREEN 54

Depress brake pedal 10 times, then close bleeder screws.

Close bleeder screws.

Press -3- button.

Display will show the following:

Fig 54: SCREEN 55

Depress brake pedal with substantial foot pressure, and hold.

Pedal moves down.
ABS hydraulic pump runs.
Pedal comes back up.

Display will show the following:

Fig 55: SCREEN 56

Release brake pedal.

Open left-front and right-front bleeder screws.

Press -3- button.

Display will show the following:

Fig 56: SCREEN 57

ABS hydraulic pump runs.

Display will show the following:

Fig 57: SCREEN 58

Depress brake pedal 10 times.

Close bleeder screws.

Press -3- button.

Display will show the following:

Fig 58: SCREEN 59

Depress brake pedal with substantial foot pressure, and hold.

Pedal moves down.
ABS hydraulic pump runs.
Pedal comes back up.

Display will show the following:

Fig 59: SCREEN 60

Release brake pedal.

Open left-front and right-front bleeder screws.

Press -3- button.

Display will show the following:

Fig 60: SCREEN 61

ABS hydraulic pump runs.

Display will show the following:

Fig 61: SCREEN 62

Depress brake pedal 10 times.

Close bleeder screws.

Press -3- button.

Display will show the following:

Fig 62: SCREEN 63

Depress brake pedal with substantial foot pressure, and hold.

Pedal moves down.
ABS hydraulic pump runs.
Pedal comes back up.

Display will show the following:

Fig 63: SCREEN 64

Release brake pedal.

Open left-front and right-front bleeder screws.

Press -3- button.

Display will show the following:

Fig 64: SCREEN 65

ABS hydraulic pump runs.

Display will show the following:

Fig 65: SCREEN 66

Depress brake pedal 10 times.

Close bleeder screws.

Press -3- button.

Display will show the following:

Fig 66: SCREEN 67

Depress brake pedal with substantial foot pressure, and hold.

Pedal moves down.
ABS hydraulic pump runs.
Pedal comes back up.

Display will show the following:

Fig 67: SCREEN 68

Release brake pedal.

Open left-front and right-front bleeder screws.,

Press -3- button.

Display will show the following:

Fig 68: SCREEN 69

ABS hydraulic pump runs.

Display will show the following:

Fig 69: SCREEN 70

Depress brake pedal 10 times.

Close bleeder screws.

Press -3- button.

Display will show the following:

Fig 70: SCREEN 71

Depress brake pedal with substantial foot pressure, and hold.

Pedal moves down.
ABS hydraulic pump runs.
Pedal comes back up.

Display will show the following:

Fig 71: SCREEN 72

Release brake pedal.

Open left-front and right-front bleeder screws.

Press -3- button.

Display will show the following:

Fig 72: SCREEN 73

ABS hydraulic pump runs.

Display will show the following:

Fig 73: SCREEN 74

Depress brake pedal 10 times.

Close bleeder screws.

Press -3- button.

Display will show the following:

Fig 74: SCREEN 75

Depress brake pedal with substantial foot pressure, and hold.

Pedal moves down.
ABS hydraulic pump runs.
Pedal comes back up.

Display will show the following:

Fig 75: SCREEN 76

Release brake pedal.

Open left-front and right-front bleeder screws.

Press -3- button.

Display will show the following:

Fig 76: SCREEN 77

ABS hydraulic pump runs.

Display will show the following:

Fig 77: SCREEN 78

Depress brake pedal 10 times.

Close bleeder screws.

Press -3- button.

Display will show the following:

Fig 78: SCREEN 79

Depress brake pedal with substantial foot pressure, and hold.

Pedal moves down.
ABS hydraulic pump runs.
Pedal comes back up.

Display will show the following:

Fig 79: SCREEN 80

Release brake pedal.

Open left-front and right-front bleeder screws.

Press -3- button.

Display will show the following:

Fig 80: SCREEN 81

ABS hydraulic pump runs.

Display will show the following:

Fig 81: SCREEN 82

Depress brake pedal 10 times.

Close bleeder screws.

Press -3- button.

Display will show the following:

Fig 82: SCREEN 83

Press buttons -0- and -6- to select "End Output" function 06.

Display will show the following:

Fig 83: SCREEN 85

Press -Q- button to confirm input.

Display will show the following:

Fig 84: SCREEN 86

Press -C- button.

Switch ignition off.

Disconnect VAG 1551 scan tool.

Bleed brake hydraulic system. See Repair Manual, Suspension, Wheels, Brakes, Steering, Repair Group 47.

TEVES 20 GI ABS AND ABS/EDL ELECTRICAL TEST

NOTE: Switch to voltage measuring range - 2 V

ELECTRICAL TEST

Test Step	VAG 1598/21Sockets	Test Of	Test Conditions - Additional Operations	Specified Value	Repairing Malfunction
11	1+17	Right rear ABS wheel speed sensor -G44- voltage signal	Vehicle raised - Ignition switched off - Rotate right front wheel at approx. 1 rev./sec.	190 mV to 1140 mV	Check installation of ABS wheel speed sensor and impulse rotor. Check whether ABS wheel speed sensor has been interchanged. See READ MEASURING VALUE BLOCK.
12	2+10	Left rear ABS wheel speed sensor -G46- voltage signal	Vehicle raised - Ignition switched off - Rotate left front wheel at approx. 1 rev./sec.	190 mV to 1140 mV	Check installationof ABS wheel speed sensor and impulse rotor. Check whether ABS wheel speed sensor has been interchanged. See READ MEASURING VALUE BLOCK.