Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLKSWAGEN1999GTI (1W1) V6-2.8L (AAA)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESDIAGNOSIS WITH VW SCAN TOOL, ADDRESS WORD 01READINESS CODE - READING / CREATINGREADINESS CODE, CREATING
1999 Volkswagen GTI (1W1) V6-2.8L (AAA)
Readiness Code, Creating
1999 Volkswagen GTI (1W1) V6-2.8L (AAA)SECTION Readiness Code, Creating
- Study following chart. Pay special attention to bits 5, 6, 7 and 8.
NOTE:
- An "x" in the diagnostic status table specification means the display can be either 0 or 1.
- If a particular bit that you are watching in the Readiness code is obtained sooner than the time specified in the chart, you can immediately proceed to the next work step.
NOTE:
- 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. Connecting and Selecting "Engine Electronics" address word 01
Work step: 1
Indicated on display
- Press buttons -0- and -2-to select "Interrogate 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.
- Press -> button.
Work step: 2
Indicated on display
- Press buttons -0- and -5-to select "Erase DTC Memory" function 05 and press -Q- button to confirm input.
Indicated on display
- Press -> button.
Work step: 3
Diagnosis: To check throttle body adaptation
Indicated on display
- 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.
Indicated on display
- Press buttons -0-, -9- and -8- to input display group 098 and press -Q- button to confirm input.
Indicated on display: (1-4 = Display fields)
- Check the specifications in display fields 3 and 4.
- 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.
Indicated on display
- Press buttons -0-and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.
Indicated on display
- Press buttons -1-, -5- and -3-to input display group 153 and press -Q- button to confirm input.
Indicated on display: (1-4 = Display fields)
- Run engine at idle and check specifications after 60 seconds.
- Press -> button
Work step: 6
Diagnosis: Engine warm-up.
- Press buttons -0- and -8-to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.
Indicated on display
- Press buttons -1-, -0- and -3- to input display group 103 and press -Q- button to confirm input.
Indicated on display: (1-4 = Display fields)
- Increase engine speed to 3000-3500 RPM and check specifications after 60 seconds.
- 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
Indicated on display
- Press buttons -0-and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.
Indicated on display
- Press buttons -1 -, -6- and -0- to input display group 160 and press -Q- button to confirm input.
Indicated on display: (1-4 = Display fields)
- Start engine and let idle, check specifications after 20 seconds.
- Press -> button
Work step: 8
Diagnosis: Engine warm-up continued (calculated temperature of Three Way Catalytic converter).
Indicated on display
- Press buttons -0- and -8-to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.
Indicated on display
- Press buttons -1-, -0-and -3-to input display group 103 and press -Q- button to confirm input.
Indicated on display: (1-4 = Display fields)
- Increase engine speed to 2200-3300 RPM and wait until catalyst temperature (field 3) reaches specification.
- Press -> button.
Work step: 9
Diagnosis: HO2S aging (regulating frequency extended).
Indicated on display
- Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q-.
NOTE:
- An "x" in the diagnostic status table specification means the display can be either 0 or 1.
- If a particular bit that you are watching in the Readiness code is obtained sooner than the time specified in the chart, you can immediately proceed to the next work step.
NOTE:
- 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. Connecting and Selecting "Engine Electronics" address word 01
Work step: 1
Indicated on display
- Press buttons -0- and -2-to select "Interrogate 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.
- Press -> button.
Work step: 2
Indicated on display
- Press buttons -0- and -5-to select "Erase DTC Memory" function 05 and press -Q- button to confirm input.
Indicated on display
- Press -> button.
Work step: 3
Diagnosis: To check throttle body adaptation
Indicated on display
- 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.
Indicated on display
- Press buttons -0-, -9- and -8- to input display group 098 and press -Q- button to confirm input.
Indicated on display: (1-4 = Display fields)
- Check the specifications in display fields 3 and 4.
- 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.
Indicated on display
- Press buttons -0-and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.
Indicated on display
- Press buttons -1-, -5- and -3-to input display group 153 and press -Q- button to confirm input.
Indicated on display: (1-4 = Display fields)
- Run engine at idle and check specifications after 60 seconds.
- Press -> button
Work step: 6
Diagnosis: Engine warm-up.
- Press buttons -0- and -8-to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.
Indicated on display
- Press buttons -1-, -0- and -3- to input display group 103 and press -Q- button to confirm input.
Indicated on display: (1-4 = Display fields)
- Increase engine speed to 3000-3500 RPM and check specifications after 60 seconds.
- 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
Indicated on display
- Press buttons -0-and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.
Indicated on display
- Press buttons -1 -, -6- and -0- to input display group 160 and press -Q- button to confirm input.
Indicated on display: (1-4 = Display fields)
- Start engine and let idle, check specifications after 20 seconds.
- Press -> button
Work step: 8
Diagnosis: Engine warm-up continued (calculated temperature of Three Way Catalytic converter).
Indicated on display
- Press buttons -0- and -8-to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.
Indicated on display
- Press buttons -1-, -0-and -3-to input display group 103 and press -Q- button to confirm input.
Indicated on display: (1-4 = Display fields)
- Increase engine speed to 2200-3300 RPM and wait until catalyst temperature (field 3) reaches specification.
- Press -> button.
Work step: 9
Diagnosis: HO2S aging (regulating frequency extended).
Indicated on display
- Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q-.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.