VAG-COM
TDI Fest 2002
Summary
• Introduction
• Basic operations
• Checking the air system
• Setting the injection timing • Special adaptations
Introduction: what is
VAG-COM?
• Emulates the dealers’ 1551 and VAG-1552 tool
• Uses Windows-based PC (100 MHz recommended)
Basic Operations
• Read/Clear/Print Fault Codes (DTC’s)
• Diagnose MIL (Check Engine Light - CEL) • Monitor/Log/Print Measuring Blocks for
various running parameters
Note
Air system part I: MAF
• Go into Engine measuring block 003 • Start Logging data
• In a high gear (4th/5th), give full throttle from 1500-2000 rpm up to 3500-4000rpm.
• Find and Open the Log file in Windows Explorer
Checking the MAF - continued
Air system part II: Turbo
• Go to Engine Measuring Block 011 • Start Logging the data
• In a high gear (4th/5th) give full throttle from 1500-2000 rpm to 3500-4000 rpm
• Find and Open the Log file in Windows Explorer
Turbo - continued
Setting the injection timing
• Engine has to be warm (coolant above 85ºC) • Go to Engine Measuring Block 000
• Switch to Basic Settings
• Take note of the values in fields 2 (timing) and 9 (fuel temp)
10
Fuel temp (9)
Setting timing-continued
• Specification is between the blue and red lines
• To slightly advance timing, you need to be in the upper portion of the graph. Setting is done
mechanically, slightly rotating the pump sprocket once its three screws have been loosened.
• It is strongly discouraged to set your timing outside of the specification!
• Graph is available at
Special adaptations: Login code
• To perform the following adaptations (except idle) you need to use the Login function.
Enter 12233 as a Login code.
• Misuse of some of the adaptations can lead to engine failure. This is done at your own risk! • Note that the EGR setting is for off-road use
Channel 1: injected quantity
• Check the injected quantity at idle, engine warm and all power consuming devices turned off. Specification is 2.5 to 9 mg/h. • To change the amount of injected fuel
perceived by the ECU, go to adaptation channel 1.
• If you have driveability problems, you may want to increase it to 3-4 mg/h.
Channel 2: idle speed
• No login required
Channel 3: EGR
• To decrease the EGR rate, increase the number to the highest possible value (typically 33768)
• This will prevent/slow down the intake manifold clogging problem and reduce smoke
• Though the MAF at idle is still within
Channel 4: start of injection
• This channel commands the start of injection over the whole operating range of the engine, including at full load. Advanced timing there may lead to severe damage to the engine
because of the increased combustion pressure. • It is in no way a substitution for the
Channel 5: starting conditions
• Though undocumented, this channel effects the injected quantity the ECU allows when cranking
Performance Measurement
More Info
• Mk IV Lock/Unlock Horn/Flash:
• [Select]
[46 - Cent. Conv.] (35 - Cent. Locking for manual window cars) [Adaptation - 10]
Channel (03..08)
Adaptation Value (1 = on, 0 = off) [Save]
Channel 03 Auto Lock Channel 04 Auto Unlock
Channel 05 Unlock, horn sounds Channel 06 Lock, horn sounds
Channel 07 Unlock, turn signals flash Channel 08 Lock, turn signals flash
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