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 MANUALSVOLKSWAGEN2002GOLF GLS, 2.0 K, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 98 (1.9L - FUEL INJECTION GLOW PLUG, ENGINE CODE: ALH (A4 PLATFORM))
2002 Volkswagen Golf GLS, 2.0 K, Standard
Section 98 (1.9L - Fuel Injection Glow Plug, Engine Code: ALH (A4 Platform))
2002 Volkswagen Golf GLS, 2.0 K, StandardSECTION Section 98 (1.9L - Fuel Injection Glow Plug, Engine Code: ALH (A4 Platform))
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Volkswagen Jetta, 2001 Volkswagen Golf, 2000 Volkswagen Jetta, 2000 Volkswagen Golf, and 1999 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- 01 On Board Diagnostic (OBD)
- On Board Diagnostic II
- On Board Diagnostic II, Features
- Malfunction Indicator Lamp (MIL) K83 , significance
- Malfunction Indicator Lamp, checking (through MY 1999)
- Malfunction Indicator Lamp (MIL) K83 , checking (from MY 2000)
- On Board Diagnostic (OBD), technical data
- Scan Tool V.A.G 1551 , connecting
- Scan Tool VAS 5051 , connecting
- Diagnostic Trouble Code (DTC) memory, checking and erasing
- DTC table: VAG codes
- Diagnostic Trouble Code (DTC) table: SAE P codes
- Function 03: Output Diagnostic Test Mode (DTM)
- Output Diagnostic Test Mode, performing
- Notes
- Conditions
- Requirements (with air conditioning)
- Work sequence
- Activating Cold Start Injector N108
- Activating EGR Vacuum Regulator Solenoid valve N18
- Activating air conditioning compressor interrupt
- Activating Fuel Cut-off Valve N109
- Activating Wastegate Bypass Regulator valve N75
- Activate Glow Plug Relay J52
- Activate Glow Plug Indicator Lamp K29
- Activating Preheating coolant, low heat output relay J359 (only on vehicles with manual transmission)
- Activating Preheating coolant, high heat output relay J360 (vehicles with manual transmission)
- Activating Malfunction Indicator Lamp (MIL) and Switch K82
- Output Diagnostic Test Mode, performing
- Readiness code
- Measuring value blocks
- Safety precautions
- Measuring value block, reading
- Evaluating measuring value blocks, at idle
- Display group 000 at idle with engine warm, coolant temperature not below 80 ° C (176 ° F)
- Display group 001 at idle with engine warm, coolant temperature not below 80 ° C (176 ° F)
- Evaluation: Injected quantity display
- Evaluation: Modulating Piston Displacement Sensor G149 voltage display
- Display group 002 at idle with engine warm, coolant temperature not below 80 ° C (176 ° F)
- Evaluation: "Throttle position" display
- Evaluation: "Operating condition" display
- Display group 003 at idle with engine warm, coolant temperature not below 80 ° C (176 ° F)
- Evaluation: Air mass drawn in (specified) display
- Evaluation: Air mass drawn in (actual) display
- Display group 004 at idle with engine warm, coolant temperature not below 80 ° C (176 ° F)
- Evaluation: Start of injection (specified) display
- Evaluation: Start of injection display (actual)
- Display group 005
- Display group 006 with ignition switched on
- Evaluation: Brake pedal monitor display
- Evaluation: Cruise control system display
- Display group 007 with ignition switched on (engine cold and not running)
- Evaluation: Fuel temperature display
- Evaluation: Intake Air Temperature display
- Evaluation: Coolant temperature display
- Display group 009
- Display group 012
- Display group 013 at idle speed with engine warm, coolant temperature not below 80 ° C (176 ° F)
- Evaluation: idle speed smooth running control display
- Display group 015
- Display group 016 at idle
- Evaluation: Additional heater display
- Evaluation: Heater element activation display
- Display group 19 with ignition on
- Evaluation: Modulating Piston Displacement Sensor G149 voltage display (start/stop)
- Evaluating measuring value blocks at full load
- Evaluating measuring value blocks at full load
- Display group 000 at Wide Open Throttle (WOT), test drive in 3rd gear, Engine Coolant Temperature 80 ° C (176 ° F) minimum
- Display group 004 at Wide Open Throttle (WOT), test drive in 3rd gear, Engine Coolant Temperature 80 ° C (176 ° F) minimum
- Evaluation: Start of injection (actual) display
- Evaluation: Cold start valve duty cycle display
- Display group 008 at Wide Open Throttle (WOT), test drive in 3rd gear, Engine Coolant Temperature 80 ° C (176 ° F)
- Evaluation: Injected quantity (drivers requirement) display
- Evaluation: Injected quantity limitation via RPM (torque limitation) display
- Evaluation: Injection quantity limitation due to air mass drawn in (smoke prevention) display
- Display group 010 at WOT, test drive in 3rd gear, Engine Coolant Temperature 80 ° C (176 ° F) minimum
- Evaluation: Air mass drawn in display
- Evaluation: Intake manifold pressure (charge pressure) display
- Evaluation: Accelerator pedal position display
- Display group 011 at Wide Open Throttle (WOT), test drive in 3rd gear, Engine Coolant Temperature 80 ° C (176 ° F) minimum
- Evaluation: Manifold Absolute Pressure display (actual)
- Evaluating measuring value blocks at full load
- On Board Diagnostic II
- 23 Diesel Fuel Injection
- Diesel direct injection system, servicing
- General information
- Safety precautions
- Rules for cleanliness
- Component locations, overview
- Injection pump, servicing
- Intake manifold flap, servicing
- Injection pump, removing and installing
- Start of injection, dynamically checking and adjusting
- Injectors, removing and installing
- Injectors, checking
- Injection timing device cover gasket, replacing
- Diesel fuel injection components and functions, checking
- Engine speed sensor, checking
- Manifold Absolute Pressure (MAP) sensor and Barometric Pressure (BARO) sensor, checking
- Engine Coolant Temperature (ECT) sensor, checking
- Brake light switch and brake pedal switch, checking
- Clutch pedal switch, checking
- Intake Air Temperature (IAT) sensor, checking
- Fuel temperature sensor, checking
- Modulating piston displacement sensor G149 and Quantity adjuster N146 , checking
- Needle lift sensor, checking
- Diesel injection timing control range, checking
- Mass Air Flow (MAF) sensor, checking
- Intake manifold flap change-over valve, checking
- Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-
- Additional signals, checking
- CAN-Bus, checking
- Diesel direct injection system, servicing
- 28 Ignition/Glow plug system
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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.