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 MANUALSVOLKSWAGEN2002PASSAT GLS 4MOTION, 4D WAGONREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM2.8L - GENERIC SCAN TOOL, ENGINE CODE(S): AHA, ATQ, AMX
2002 Volkswagen Passat GLS 4Motion, 4D Wagon
2.8L - Generic Scan Tool, Engine Code(S): Aha, ATQ, AMX
2002 Volkswagen Passat GLS 4Motion, 4D WagonSECTION 2.8L - Generic Scan Tool, Engine Code(S): Aha, ATQ, AMX
- 20 - Fuel supply
- Fuel Supply System
- Evaporative Emissions (EVAP) System
- Electronic engine power control (EPC), Checking
- Function of the "EPC" system (Engine Code ATQ, Model Year 20012005)
- Throttle Drive Angle Sensor 1 (for Electronic Power Control (EPC)) G187 / Throttle Drive Angle Sensor 2 (for Electronic Power Control (EPC)) G188, checking
- Throttle Position (TP) Sensor G69 / Throttle Position (TP) Sensor G88, Checking (Engine Code ATQ Model Year 2000)
- Throttle Position (TP) Sensor G69 / Throttle Position (TP) Sensor G88, Checking (Engine Code AHA)
- 24 - Multiport Fuel Injection (MFI)
- Motronic fuel injection system, servicing
- Components, checking
- Heated Oxygen Sensor (HO2S) before catalytic converter, heater circuit checking.
- Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC), heater circuit checking.
- Mass Air Flow (MAF) Sensor G70, checking
- Intake Air Temperature (IAT) Sensor G42 (Engine Code ATQ) or Intake Air Temperature (IAT) Sensor G72 (Engine Code AHA), Checking
- Throttle Valve Control Module J338, checking
- Engine Coolant Temperature (ECT) Sensor G62, checking
- Engine Speed (RPM) Sensor G28, checking
- Engine Speed (RPM) Sensor G28, checking (Engine Code ATQ)
- Fuel Injector, checking
- Function tests
- Engine Control Module (ECM) J220
- Additional signals, checking
- 26 - Exhaust system, Emission controls
- Exhaust system components, removing and installing
- Secondary Air Injection (AIR) System
- 28 - Ignition/Glow plug System
- Ignition, servicing
- 34 - Controls, Housing
- ST - Generic Scan Tool
- On Board Diagnostic (OBD)
- Diagnostic modes
- Diagnostic Modes Description
- Diagnostic Mode 01: Obtain data
- Diagnostic Mode 02: Obtain operating conditions
- Mode 03: Interrogating fault memory
- Interrogating the Fault Memory
- Diagnostic Mode 04: Reset/delete diagnostic data
- Diagnostic Mode 05: Check lambda test results
- Diagnostic Mode 05: Check lambda test results (Engine Code AHA)
- Diagnostic mode 6: Checking test results of components that are not continuously monitored
- Diagnostic mode 6: Checking test results of components that are not continuously monitored (Engine Code ATQ)
- Notes
- Test-ID 01 ($01): Catalytic Conversion (Bank 1).
- Test-ID 01 ($01): Catalytic Conversion (Bank 2).
- Test-ID 02 ($02): Oxygen Sensor (Bank 1, Sensor 1).
- Test-ID 02 ($02): Oxygen Sensor (Bank 2, Sensor 1).
- Test-ID 03 ($03): Secondary Air Injection (AIR) System (Bank 1).
- Test-ID 03 ($03): Secondary Air Injection (AIR) System (Bank 2).
- $05 (05): Tank Ventilation System, Tank Vent Valve Function Check
- Test-ID 05 (05): Tank Ventilation System, Tank Leak Test
- Diagnostic mode 6: Checking test results of components that are not continuously monitored (Engine Code AHA)
- Notes
- Test-ID 01 ($01): Catalytic Conversion (Bank 1).
- Test-ID 01 ($01): Catalytic Conversion (Bank 2).
- Test-ID 02 ($02): Oxygen Sensor (Bank 1, Sensor 1).
- Test-ID 02 ($02): Oxygen Sensor (Bank 2, Sensor 1).
- Test-ID 03 ($03): Secondary Air Injection (AIR) System.
- $05 (05): Tank Ventilation System, Tank Vent Valve Function Check
- Test-ID 05 (05): Tank Ventilation System, Tank Leak Test
- Diagnostic mode 6: Checking test results of components that are not continuously monitored (Engine Code ATQ)
- Diagnostic Mode 07: Check test results of components that are continuously monitored
- Diagnostic Mode 08: Tank leak test
- Diagnostic Mode 09: Vehicle information
- General Diagnosis
- Readiness Code
- Diagnostic Trouble Code (DTC) tables, (Engine Code ATQ)
- Diagnostic Trouble Code (DTC) tables (Engine Code AHA)
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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.