With Manufacturer's Scan Tool
Readiness code, creating
Special tools, testers and auxiliary items
- VAG 1551/1552 scan tool with VAG 1551/3 adapter cable
Note:
- During test sequence the ignition must not be switched off.
- If the specifications are obtained before the time specified in the table, you can proceed to the next work step.
- On vehicles up to m.y. 96 the function bits in the readiness code are set to 0 together, when the last diagnosis has been successfully completed.
- On vehicles from m.y. 97 the function bits in the readiness code are set to 0 individually, for each successfully completed diagnosis.
Test sequence
WARNING!
When driving or riding in an airbag-equipped vehicle:
- Never hold test equipment in your hands or lap while the vehicle is in motion. Objects between you and the airbag can increase the risk of injury in an accident.
- Secure tools or test equipment on passenger side floor where it can be safely read by the second technician.
Work step: 1
- Connect VAG 1551/1552 scan tool and select "Engine Electronics" address word 01.
When doing this, the ignition must be switched on.
1) The relevance of the Function Bit varies depending upon the work step.
Note:
- There must not be any malfunctions stored in DTC memory or detected during this diagnostic test.
- If the CYCLE bit has a 1, the diagnosis is completed and the test sequence can be implemented.
- The specifications for the function bits must only be satisfied during the diagnostic phase (ACTIVE bit = 1).
- An "x" shown in the diagnostic status table means the display can show either "0" or "1".
Work step: 2
Rapid data transfer HELP
Select function XX
Indicated on display
- Press buttons -0- and -2- to select "Check DTC Memory" function 02 and press -Q- button to confirm input.
X DTC recognized ->
The number of malfunctions stored or "No DTC recognized" will be shown on the display.
- Locate and eliminate malfunctions printed out as per DTC table.
- Press -> button.
Work step: 3
Rapid data transfer HELP
Select function XX
Indicated on display
- Press buttons -0- and -5- to select "Erase DTC Memory" function 05 and press -Q- button to confirm input.
Rapid data transfer ->
DTC Memory is erased
Indicated on display
- Press -> button.
Work step: 4
- Start engine and run at idle speed.
Work step: 5
Rapid data transfer HELP
Select function XX
Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.
Read Measuring Value Block HELP
Input display group number XXX
Indicated on display
- Press buttons -1-, -0- and -3- to input display group 103 and press -Q- button to confirm input.
Read Measuring Value Block 102 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Increase engine speed to 3000-3500 RPM and check specifications after 60 seconds.
- Press -> key.
Work step: 6
Diagnosis: Secondary Air Injection (AIR) system
Test conditions
• Vehicle stationary, engine at idle
- Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.
Basic Setting HELP
Input display group number XXX
Indicated on display
- Press buttons -1-, -6- and -0- to input display group 160 and press -Q- button to confirm input.
System in Basic Setting 160 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Start engine and run at idle speed and check specifications after 20 seconds.
- Press -C- button.
Work step: 7
Rapid data transfer HELP
Select function XX
Indicated on display
- Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.
Basic Setting HELP
Input display group number XXX
Indicated on display
- Press buttons -1-, -0- and -3- to input display group 103 and press -Q- button to confirm input.
System in Basic Setting 103 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Increase engine speed to 2200-3300 RPM and check specifications after 120 seconds.
- Press -C- button.
Work step: 8
Diagnosis: Oxygen Sensor (O2S) aging (regulating frequency extended)
Basic Setting HELP
Input display group number XXX
Indicated on display
- Press buttons -1-, -3- and -1- to input display group 131 and press -Q- button to confirm input.
System in Basic Setting 131 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Run engine at idle speed for at least 30 seconds and check specifications.
- Press -C- button.
Work step: 9
Diagnosis: Oxygen Sensor (O2S) adaptation in partial load range
Basic Setting HELP
Input display group number XXX
Indicated on display
- Press buttons -1-, -2- and -5- to input display group 125 and press -Q- button to confirm input.
System in Basic Setting 125 ->
1 2 3 4
Indicated on display (1-4 = display fields)
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.
- Test drive with the following special requirements:
• Automatic transmission: Drive range 2
• Manual transmission: 2nd gear
• Engine speed must be kept between 2500-4000 RPM.
- Continue test drive until all specifications are attained.
- Check specifications during test drive (second technician necessary).
- Press -C- button.
Work step: 10
Diagnosis: Oxygen Sensor (O2S) adaptation in idle range
Test conditions
• Engine coolant temperature min. 60�C (140�F) ( => display group 001, display field 2)
• Intake air temperature max. 80�C (176�F) ( => display group 003, display field 4)
System in Basic Setting 125 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Run engine at idle speed and check specifications after 40 seconds.
- Press -C- button.
Work step: 11
Diagnosis: Oxygen Sensor (O2S) aging (regulating frequency extended)
Test conditions
• Vehicle stationary
Basic Setting HELP
Input display group number XXX
Indicated on display
- Press buttons -1-, -3- and -0- to input display group 130 and press -Q- button to confirm input.
System in Basic Setting 130 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Increase engine speed to 2500-3500 RPM for 20 seconds and check specifications.
Note: In display field 3 (period counter) in the following table for vehicles m.y. 97> the specification is given as 10. Vehicles m.y. >97 only require 6 heated oxygen sensor periods for diagnosis.
- Press -C- button.
Work step: 12
Diagnosis: Three Way Catalytic Converter (TWC)
Basic Setting HELP
Input display group number XXX
Indicated on display
- Press buttons -1-, -3- and -6- to input display group 136 and press -Q- button to confirm input.
System in Basic Setting 136
1 2 3 4
Indicated on display (1-4 = display fields)
- Increase engine speed to 2500-3500 RPM and check specifications after 120 seconds.
- Press -C- button.
Work step: 13
Diagnosis: Fuel tank venting system (EVAP canister purge regulator valve)
Test conditions
• Vehicle stationary
• Electrical consumers switched off (radiator coolant fan must not run during the check)
• Air conditioner switched off
Note: The engine must be at idle during this diagnosis because the diagnosis will be interrupted and will not be started again until the engine is revved-up.
Basic Setting HELP
Input display group number XXX
Indicated on display
- Press buttons -1-, -5- and -0- to input display group 150 and press -Q- button to confirm input.
System in Basic Setting 150 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Run engine for 30 seconds at idle speed and check specifications.
- Press -> button.
Work step: 14
- Read readiness code.
- If the readiness code is not OK, perform optional work steps 15 through 22.
Work step: 15
Diagnosis: Vehicle Speed Sensor (VSS)
Rapid data transfer HELP
Select function XX
Indicated on display
- Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.
Basic Setting HELP
Input display group number XXX
Indicated on display
- Press buttons -1-, -8- and -0- to input display group 180 and press -Q- button to confirm input.
System in Basic Setting 180 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Test drive according to the following special requirements:
• Select drive range 2 (automatic) or 3rd gear (manual)
• Engine speed above 3500 and 5 seconds ...
... then release accelerator pedal for 3 seconds.
After 3 seconds, vehicle speed must still be at least 20 km/h (13 mph) and have been in deceleration fuel cut-off for a minimum of 2 secs.
- Check specifications during test drive (second technician necessary).
- Press -C- button.
Work step: 16
Diagnosis: Knock Sensor (KS) 1
Test conditions
• Vehicle stationary
Basic Setting HELP
Input display group number XXX
Indicated on display
- Press buttons -1-, -4- and -5- to input display group 145 and press -Q- button to confirm input.
System in Basic Setting 145 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Increase engine speed to at least 3200 RPM and check specifications after 15 seconds.
- Press -3- button (VAG1551) or "up arrow" button (VAG 1552).
Work step: 17
Diagnosis: Knock Sensor (KS) 2
Test conditions
• Vehicle stationary
System in Basic Setting 145 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Increase engine speed to at least 3200 RPM and check specifications after 15 seconds.
- Press -C- button.
Work step: 18
Diagnosis: Heated Oxygen Sensor (HO2S) (before three way catalytic converter)
Basic Setting HELP
Input display group number XXX
Indicated on display
- Press buttons -1-, -1- and -5- to input display group 115 and press -Q- button to confirm input.
System in Basic Setting 115 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Increase engine speed to 2200-2800 RPM and check the specifications.
- Press key 3 (V.A.G 1551) or key "arrow up" (V.A.G 1552).
Work step: 19
Diagnosis: Heated Oxygen Sensor (HO2S) after three way catalytic converter
System in Basic Setting 116 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Increase engine speed to 2200-2800 RPM and check specifications after 15 seconds.
- Press -C- button.
Work step: 20
Diagnosis: Oxygen Sensor (O2S) heating (before and after three way catalytic converter)
Basic Setting HELP
Input display group number XXX
Indicated on display
- Press buttons -1-, -2- and -0- to input display group 120 and press -Q- button to confirm input.
System in Basic Setting 120 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Increase engine speed to 2200-2800 RPM and check the specifications.
- Press -3- button (VAG 1551 scan tool) or button "arrow up" (VAG 1552).
System in Basic Setting 121 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Increase engine speed to 2200-2800 RPM and check specifications.
- 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.
- Press buttons -1-, -4- and -0- to input display group 140 and press -Q- button to confirm input.
System in Basic Setting 140 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Run engine at idle speed and check specifications.
- Run engine at idling speed.
- Press -3- button (VAG 1551) or button "arrow up" (VAG 1552).
System in Basic Setting 141 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Run engine at idle speed.
- Press -3- button (VAG 1551 scan tool) or button "arrow up" (VAG 1552 scan tool).
System in Basic Setting 142 ->
1 2 3 4
Indicated on display (1-4 = display fields)
- Run engine at idle speed.
- Press -> button.
Work step: 22
- Read readiness code.
- Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.