2.8L (Engine Code AAA) - Readiness Code Creating (GROUP 01, NO. 96-03)

Publication date: 1996-02-14
Reference number: GROUP 01, NO. 96-03

2.8L (ENGINE CODE AAA) - READINESS CODE CREATING

TECHNICAL SERVICE BULLETIN

Reference Number(s): GROUP 01, NO. 96-03, Date of Issue: February 14, 1996

READINESS CODE, CREATING

Model(s): 1996-on Volkswagen Jetta GLX, GTI with OBD II 2.8 Liter, Engine Code AAA

Group: 01 - On-Board Diagnostic

Bulletin No.: 96-03

Date: February 14, 1996

File this Technical Bulletin in Repair Manual No.: W42 011 294 123.

SERVICE INFORMATION

The following article contains a revised procedure for creating the Readiness Code. This information supersedes the procedure found in your current Repair Manual and will be integrated during the next Repair Manual update.

NOTE: Work Steps 5 (Leak down Detection pump checking) and 7 (Secondary Air Injection) do NOT apply to current production vehicles for model year 1996.

To display Readiness Codes the VAG 1551 Scan Tool must meet the following requirements:

Must have a 5.0 (or higher) Program Card installed
Must be properly encoded with the Workshop Code

READINESS CODE, CREATING

Study the following chart. Pay special attention to bits 5, 6, 7 and 8.

RELEVANCE OF 8-DIGIT NUMBER BLOCK IN DISPLAY FIELD 4

1	2	3	4	5	6	7	8	Diagnostic Status
1								Diagnostic Trouble Code (DTC) memory 1 = Malfunction in system; 0 = No DTCs recognized
1							ERROR bit (specific to display group being viewed) 1 = Malfunction detected; 0 = No malfunction detected
1						CYCLE bit 1 = Diagnosis complete; 0 = Diagnosis not performed yet
1					ACTIVE bit 1 = Diagnosis active; 0 = Diagnosis inactive
X				Function bit
X			Function bit
X		Function bit
X	Function bit

NOTE: * An "X" in the diagnostic status means the display can be either a 0 or a 1.

If a particular bit that you are watching in the Readiness code is obtained sooner than the time specified in the procedure, you can immediately proceed to the next work step.
There must not be a malfunction stored in DTC memory and there must be no malfunctions detected during diagnosis.
During the test sequence the ignition must not be switched off.

SPECIAL TOOLS, TESTERS AND AUXILIARY ITEMS

VAG 1551/1552 scan tool with VAG 1551/3 adapter cable

TEST SEQUENCE

Connect VAG 1551/1552 Scan Tool (with ignition switched ON) and select address word 01 "Engine Electronics".

WORK STEP: 1

Display will show the following:

Fig 1: SCREEN 1

Press buttons -0- and -2- to select "Check DTC Memory" function 02 and press -Q- button to confirm input.

The number of malfunctions stored or"No DTC recognized" will be shown on the display.

Fig 2: SCREEN 2

Press --> button.

WORK STEP: 2

Display will show the following:

Fig 3: SCREEN 3

Press buttons -0- and -5- to select "Erase DTC Memory" function 05 and press -Q- button to confirm input.

Display will show the following:

Fig 4: SCREEN 4

Press --> button.

WORK STEP: 3

Diagnosis: To check throttle body adaptation

Display will show the following:

Fig 5: SCREEN 5

Switch ON ignition but do NOT start engine.

Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.

Display will show the following:

Fig 6: SCREEN 6

Press buttons -0-, -9- and -8- to Input display group 098 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 7: SCREEN 7

Check the specifications in display fields 3 and 4.

Fig 8: SPECIFICATION TABLE A

Press --> button.

WORK STEP: 4

Start engine and let idle.

WORK STEP: 5

Diagnosis: Leak diagnosis for tank venting system

NOTE: Not all vehicles have this system installed. If this system is not found on the vehicle you are working with; skip this work step.

Display will show the following:

Fig 9: SCREEN 8

Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.

Display will show the following:

Fig 10: SCREEN 9

Press buttons -1-, -5- and -3- to input display group 153 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 11: SCREEN 10

Run engine at idle and check specifications after 60 seconds.

Fig 12: SPECIFICATION TABLE B

Press --> button.

WORK STEP: 6

Diagnosis: Engine warmup

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 13: SCREEN 11

Press buttons -1-, -0- and -3- to input display group 103 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 14: SCREEN 12

Increase engine speed to 3000-3500 RPM and check specifications after 60 seconds.

Fig 15: SPECIFICATION TABLE C

Press --> button.

WORK STEP: 7

Diagnosis: Secondary Air Injection system

NOTE: Not all vehicles have this system installed. If this system is not found on the vehicle you are working with; skip this work step.

Vehicle stationary

Display will show the following:

Fig 16: SCREEN 13

Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.

Display will show the following:

Fig 17: SCREEN 14

Press buttons -1-, -6- and -0- to input display group 160 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 18: SCREEN 15

Start engine and let idle check specifications after 20 seconds.

Fig 19: SPECIFICATION TABLE D

Press --> button.

WORK STEP: 8

Diagnosis: Engine warmup continued (calculated temperature of Three Way Catalytic converter)

Display will show the following:

Fig 20: SCREEN 16

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 21: SCREEN 17

Press buttons -1-, -0- and -3- to input display group 103 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 22: SCREEN 18

Increase engine speed to 2200-3300 RPM and wait until catalyst temperature (field 3) reaches specification.

Fig 23: SPECIFICATION TABLE E

Press --> button.

WORK STEP: 9

Diagnosis: H02S aging (regulating frequency extended)

Display will show the following:

Fig 24: SCREEN 19

Press buttons -0- and -4- to select "Basic Settings" function 04 and press -Q- button to confirm input.

Display will show the following:

Fig 25: SCREEN 20

Press buttons -1-, -3- and -1- to input display group 131 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 26: SCREEN 21

Run engine at idle and check the specifications.

Fig 27: SPECIFICATION TABLE F

Press -C- button.

WORK STEP: 10

Diagnosis: Fuel adaptation under partial load

Display will show the following:

Fig 28: SCREEN 22

Press buttons -1-, -2- and -5- to input display group 125 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 29: SCREEN 23

Test drive per the following conditions:

ROAD TEST PROCEDURE

10 minutes duration minimum
Engine coolant temperature 80°C (176°F) minimum

Briefly depress accelerator pedal to wide open throttle (once during road test) and accelerate until rpm's exceed 5000.

Cruise between 2700-3000 RPM for 4 seconds with NO decels.

NOTE: Avoid deceleration fuel cut-off during this diagnosis, as this causes the three way catalytic converter to store oxygen, and diagnosis will be blocked for at least 10 seconds.

Automatic transmission: Drive range 2
Manual transmission: 2nd gear

Check specs during test drive (second technician necessary).

WARNING: When driving or working in Airbag equipped vehicles. NEVER allow test equipment or tools in the air bag expansion zones. A sudden stop or impact could push those objects against the driver or passenger resulting in possible injuries. Instead; safely secure tools or test equipment on the passenger side floor where it can safely be read by a second technician.

Fig 30: SPECIFICATION TABLE G

WORK STEP: 11

Diagnosis: Fuel adaptation during idle

TEST CONDITIONS

Bring vehicle to stationary position and let idle

Display will show the following (1-4 = Display fields):

Fig 31: SCREEN 24

Check specifications after 30 seconds.

Fig 32: SPECIFICATION TABLE H

Press -C- button.

WORK STEP: 12

Diagnosis: HO2S aging (regulating frequency extended)

TEST CONDITIONS

Vehicle stationary

Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.

Display will show the following:

Fig 33: SCREEN 25

Press buttons -1-, -3- and -0- to input display group 130 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 34: SCREEN 26

Raise engine RPM to 2500-3500 for 20 seconds and check specs.

Fig 35: SPECIFICATION TABLE H

Press -C- button.

WORK STEP: 13

Diagnosis: Three Way Catalytic Converter

Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to Confirm Input.

Display will show the following:

Fig 36: SCREEN 27

Press buttons -1-, -3- and -6- to input display group 136 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 37: SCREEN 28

Increase engine speed to 2500-3500 RPM and check specifications after 120 seconds.

Fig 38: SPECIFICATION TABLE I

Press -C- button.

WORK STEP: 14

Diagnosis: Tank venting system (EVAP canister purge regulator valve)

Vehicle stationary
All electrical consumers switched off (coolant fan must not run)
A/C switched off

NOTE: Engine must not be under load during diagnosis or the diagnostic will be interrupted and not started again until engine is revved-up.

Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.

Display will show the following:

Fig 39: SCREEN 29

Press buttons -1-, -5- and -0- to input display group 150 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 40: SCREEN 30

Run engine for 30 seconds at idle; check specifications.

NOTE: For Work Step 14, look for either display field 2 or display field 3 specification fulfillment, but not both. Fulfillment of either display is acceptable.

Fig 41: SPECIFICATION TABLE J

Press --> button.

WORK STEP: 15

Read readiness code.

If the readiness code not OK

Perform optional work steps 16 through 24.

WORK STEP: 16

Diagnosis: Vehicle Speed Sensor

Display will show the following:

Fig 42: SCREEN 31

Press buttons -0- and -4- to select "Basic Settings function 04 and press -Q- button to confirm input.

Display will show the following:

Fig 43: SCREEN 32

Press buttons -1-, -8- and -0- to input display group 180 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 44: SCREEN 33

Test drive per the following conditions:

Hold engine speed above 3500 RPM for 5 seconds...

Automatic transmission: Drive range 2
Manual transmission: 3rd gear

... then release accelerator pedal for 3 seconds.

After 3 seconds vehicle speed must still be 20 km/h (13 mph).

Check specs during test drive (second technician necessary).

WARNING: When driving or working in Airbag equipped vehicles: NEVER allow test equipment or tools in the air bag expansion zones. A sudden stop or impact could push those objects against the driver or passenger resulting in possible injuries. Instead; safely secure tools or test equipment on the passenger side floor where it can safely be read by a second technician.

Fig 45: SPECIFICATION TABLE K

Press -C- button.

WORK STEP: 17

Diagnosis: Knock Sensor

TEST CONDITIONS

Vehicle stationary

Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.

Display will show the following:

Fig 46: SCREEN 34

Press buttons -1-, -4- and -5- to input display group 145 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 47: SCREEN 35

Increase engine speed to at least 3200 RPM and check specifications after 15 seconds.

NOTE: This bulletin supersedes Service Bulletin , dated .

Fig 48: SPECIFICATION TABLE L

Press --> button.

WORK STEP: 18

Diagnosis: HO2S (before three way catalytic converter)

Display will show the following:

Fig 49: SCREEN 36

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 50: SCREEN 37

Press buttons -1-, -1- and -5- to input display group 115 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 51: SCREEN 38

Increase engine speed to 2200-2800 RPM and check specs.

Fig 52: SPECIFICATION TABLE M

Press --> button.

WORK STEP: 19

Diagnosis: HO2S (after three way catalytic converter)

Display will show the following:

Fig 53: SCREEN 39

Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.

Display will show the following:

Fig 54: SCREEN 40

Press buttons -1-, -1- and -6- to input display group 116 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 55: SCREEN 41

Rev engine from idle to 3000 RPM in a single throttle application; check specifications during deceleration phase.

Fig 56: SPECIFICATION TABLE N

Press --> button.

WORK STEP: 20

Diagnosis: HO2S heating (before three way catalytic converter)

Display will show the following:

Fig 57: SCREEN 42

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 58: SCREEN 43

Press buttons -1-, -2- and -0- to input display group 120 and press -Q- button to confirm input.

Display will show the following (1-4 = Display fields):

Fig 59: SCREEN 44

Increase engine speed to 2200-2800 RPM and check the specs.

Fig 60: SPECIFICATION TABLE O

Press -3- button (VAG 1551 scan tool) or "UP ARROW" button (VAG 1552).

Display will show the following (1-4 = Display fields):

Fig 61: SCREEN 45

Increase engine speed to 2200-2800 RPM and check specs.

Fig 62: SPECIFICATION TABLE P

Press -C- button.

WORK STEP: 21

Diagnosis: Throttle valve control module

NOTE: There are no specifications for this diagnosis. The values in the display fields are typical for this diagnosis. If other values are shown it does not indicate a system malfunction. The diagnostic functions run in the background during the check.

Display will show the following:

Fig 63: SCREEN 46