Section 13 (1.9L - Fuel Injection Glow Plug, Engine Code ALH, From My 2002 (A4 Platform))
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2006 Volkswagen Golf, 2005 Volkswagen Jetta, 2005 Volkswagen Golf, 2004 Volkswagen Jetta, and 2004 Volkswagen Golf. However, it is still accessible from the selected car via links, so may be relevant.
- 01 On Board Diagnostic (OBD)
- On Board Diagnostic
- DTC table: VAG codes
- Function 03: Output Diagnostic Test Mode (DTM)
- Performing Output Diagnostic Test Mode
- Notes
- Test conditions
- Prerequisites (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 period warning lamp K29 :
- Activating Relay for low heat output J359 (only on vehicles with manual transmission):
- Activating Relay for high heat output J360 (vehicles with manual transmission):
- Activating Malfunction Indicator Lamp (MIL) and Switch K82 :
- Performing Output Diagnostic Test Mode
- Readiness code
- Measured value blocks
- Safety precautions
- Measured value block, reading
- Evaluating Measured value blocks, at idle
- Display group 000 at idle with engine warm, coolant temperature above 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 above 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
- 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 above 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 positions)
- 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 above 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 above 80 ° C (176 ° F)
- 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 above 80 ° C (176 ° F)
- Evaluation: Manifold Absolute Pressure display (actual)
- 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
- Diesel direct injection system voltage supply, checking
- Engine Speed (RPM) Sensor G28 , checking
- Manifold Absolute Pressure (MAP) sensor G71 and Barometric Pressure (BARO) sensor F96 , checking
- Engine Coolant Temperature (ECT) sensor G62 , checking
- Checking intake manifold temperature sensor
- Fuel temperature sensor G81 , checking
- Modulating piston displacement sensor G149 and quantity adjuster N146 , checking
- Needle lift sensor G80 , checking
- Diesel injection timing control range, checking
- Mass Air Flow (MAF) sensor G70 , checking
- Intake Manifold Flap Change-over Valve N239 , checking
- Additional signals, checking
- Diesel Direct Fuel Injection (DFI) Engine Control Module
- Diesel direct injection system, servicing
- 28 Ignition/Glow plug system