1.9L - Fuel Injection Glow Plug, Engine Code ALH, From My 2002 (A4 Platform)

• 01 On Board Diagnostic (OBD)
  • On Board Diagnostic
    • On Board Diagnostic, Features
    • Malfunction Indicator Lamp Significance
      • Notes
      • Functional check:
    • On Board Diagnostic (OBD), technical data
      • Control Module identification
        • Notes
        • Technical data
        • Selectable functions, when using Scan Tools (ST) VAG1551 /1552 or VAS5051
        • Address word 33, CARB / OBD II, Selectable functions (modes)
    • Scan Tool VAG1551 , connecting
      • Notes
      • Prerequisites
      • Work sequence
    • Scan Tool VAS5051 , connecting
      • Notes
      • Test conditions
      • Work sequence
      • Select operating mode:
      • Select vehicle system:
      • Select diagnostic function:
    • Diagnostic Trouble Code (DTC) memory, checking and erasing
      • Notes
      • Work sequence
      • Test conditions
      • Automatic test sequence
  • DTC table: VAG codes
    • 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 :
  • Readiness code
    • Readiness code
    • Reading readiness code
      • Notes
      • Work sequence
    • Readiness code, displaying
      • Notes
      • Work sequence
    • Readiness code, setting
      • Notes
      • Test conditions
      • Work sequence
  • Measured value blocks
    • Safety precautions
    • Measured value block, reading
      • Notes
      • Test conditions
      • Work sequence
    • 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
        • Notes
        • Vehicles with 2-digit number block
        • Vehicles with 8-digit number block
      • 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
      • Notes
      • Types of injection pump sprocket securing bolts
        • Notes
        • Version A: Securing bolts with chamfer on shaft and pointed end -arrows-
        • Version B: Securing bolts without chamfer on shaft and without pointed end
    • Intake manifold flap, servicing
    • Injection pump, removing and installing
      • Notes
      • Removing
      • Installing
    • Start of injection, dynamically checking and adjusting
      • Notes
      • Work sequence
    • Injectors, removing and installing
      • Notes
      • Removing
      • Installing
    • Injectors, checking
      • Notes
      • Test conditions
      • Checking injection pressure
      • Checking for leaks
    • Injection timing device cover gasket, replacing
  • Diesel fuel injection components and functions, checking
    • Diesel direct injection system voltage supply, checking
      • Notes
      • Check conditions
      • Test sequence
    • Engine Speed (RPM) Sensor G28 , checking
      • Notes
      • Test sequence
    • Manifold Absolute Pressure (MAP) sensor G71 and Barometric Pressure (BARO) sensor F96 , checking
      • Notes
      • Test sequence
    • Engine Coolant Temperature (ECT) sensor G62 , checking
      • Notes
      • Test conditions
      • Test sequence
    • Checking intake manifold temperature sensor
      • Notes
      • Test sequence
    • Fuel temperature sensor G81 , checking
      • Notes
      • Test sequence
    • Modulating piston displacement sensor G149 and quantity adjuster N146 , checking
      • Notes
      • Test sequence
      • Checking Modulating Piston Displacement Sensor G149.
      • Checking Quantity Adjuster N146
    • Needle lift sensor G80 , checking
      • Notes
      • Test sequence
    • Diesel injection timing control range, checking
      • Notes
      • Test sequence
    • Mass Air Flow (MAF) sensor G70 , checking
      • Notes
      • Check conditions
      • Test sequence
    • Intake Manifold Flap Change-over Valve N239 , checking
      • Notes
      • Check conditions
      • Checking function
      • Test sequence
  • Additional signals, checking
    • Speed signal, testing
      • Notes
      • Check conditions
      • Test sequence
    • Automatic transmission shift change signal, checking
      • Notes
      • Test sequence
    • Brake light switch F and Brake Pedal Switch F47 , checking
      • Notes
      • Check conditions
      • Test sequence
    • Clutch Pedal Switch F36 , checking
      • Notes
      • Check conditions
      • Test sequence
    • A/C system signals, checking
      • Notes
      • Test conditions
      • Compressor shut-off, checking
      • Test sequence
      • A/C signal and engine speed adaptation, checking
    • Engine speed signal, checking
      • Notes
      • Test sequence
  • Diesel Direct Fuel Injection (DFI) Engine Control Module
    • Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 , replacing
      • Notes
      • Work sequence
      • Installing
    • Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 , coding
      • Notes
      • Work sequence
    • CAN-bus, checking
      • Notes
      • Test conditions
      • Test sequence
        • Notes
        • If the resistance measurement is outside the specified range:
        • If the resistance value is within the specified range:
• 28 Ignition/Glow plug system
  • Glow plug system, checking
    • Glow plug system, checking
      • Notes
      • Vehicles from model year 2002 →
    • Glow plugs, checking
      • Notes
      • Test conditions
      • Test sequence