Section 34 (1.9L - Fuel Injection Glow Plug, Engine Code ALH, From My 2002 (A4 Platform))
WARNING: This page is about a different variant/trim than selected.
- 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