Checking commencement of injection: VW 2.5 TDI (ACV, AGX, AHD, AHY, …)
Step-by-step checking commencement of injection for the VW 2.5 TDI: factory workshop text. What to remove, in what order, and what to check after.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
📐 20 workshop diagrams for ACV
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
Checking commencement of injection
Connect vehicle diagnosis, testing and information system
VAS 5051 (see the separate procedure)
. When doing this, the engine must be running at idling speed.
Press key
“04 - Basic settings” on display.
Press key (0) for
“Display group number 0” and confirm entry with (Q) key.
Engine code AHD ▸ 04.98:
Commencement of injection in display zone 2 is dependent on fuel temperature in display zone 9.
A - Zone 2: Commencement of injection
B - Zone 9: Fuel temperature
C - Specified range for commencement of injection
Example:
Numerical value 130 in display zone 9 (B) corresponds to a numerical value range of 41...61 in display zone 2 (A).
Engine code AHD 05.98 ▸:
Fuel temperature in display zone 9 must be within numerical value range of 120...190 to read commencement of injection in display zone 2
A - Zone 2: Commencement of injection
B - Zone 9: Fuel temperature
C - Specified range for commencement of injection
Example:
Numerical value 140 in display zone 9 (B) corresponds to a numerical value range of 38...67 in display zone 2 (A).
Engine code AGX ▸ 01.99:
Commencement of injection in display zone 2 is dependent on fuel temperature in display zone 9.
A - Zone 2: Commencement of injection
B - Zone 9: Fuel temperature
C - Specified range for commencement of injection
Example:
Numerical value 130 in display zone 9 (B) corresponds to a numerical value range of 49...69 in display zone 2 (A).
Engine code AGX 02.99 ▸:
Commencement of injection in display zone 2 is dependent on fuel temperature in display zone 9.
A - Zone 2: Commencement of injection
B - Zone 9: Fuel temperature
C - Specified range for commencement of injection
Example:
Numerical value 130 in display zone 9 (B) corresponds to a numerical value range of 49...72 in display zone 2 (A).
Engine codes ANJ, APA, AVR, BBE, BBF
Fuel temperature in display zone 9 must be within numerical value range of 120...190 to read commencement of injection in display zone 2
A - Zone 2: Commencement of injection
B - Zone 9: Fuel temperature
C - Specified range for commencement of injection
Example:
Numerical value 140 in display zone 9 (B) corresponds to a numerical value range of 38...72 in display zone 2 (A).
Continuation for all engine codes
Note
Providing commencement of injection is within the specification zone (C) during the check, no adjustment is required. After repairs, e.g. removing and installing injection pump, adjusting timing, the commencement of injection is to be set to the mean value (dashed line) of specification zone (C).
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix → · How these pages are made →Workshop data on this page last updated 20 Sep 2026.