LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Audi >> 1994 >> S4 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> ECM Identification >> Checking ECM Version
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Checking ECM Version

NOTE: Following procedure is for checking ECM version using manufacturer scan tool (VAG 1551).
  1. Check DTC memory. See RETRIEVING DIAGNOSTIC TROUBLE CODES  .
  2. Display will read - "RAPID DATA TRANSFER" "SELECT FUNCTION XX".
  3. Press buttons -0- and -1- to select "CHECK CONTROL MODULE VERSIONS" function 01.
  4. Display will read - "RAPID DATA TRANSFER" "01-CHECK CONTROL MODULE VERSION".
  5. Press -Q- button to confirm input.
  6. Display will read - "4A0907551AA 2.21 R5 MOTR RHV HS D" "CODING 4".
  7. This display can be broken down as follows, see MOTRONIC ENGINE CONTROL MODULE VERSION  table.
CHECKING ECM VERSION

Applications Scan Tool Display
ECM Identification (1) 4A0907551AA
Engine Displacement 2.21 Liter
Engine Type: R In-Line 5 Cylinder
Fuel Injection Type: MOTR Motronic Multiport Fuel Injection
Ignition Type: RHV Resting High Voltage Distribution
Transmission Type: HS Manual
Transmission Type: AT Automatic
ECM Software: "D" Manufacturers Use Only
Coding (Number) (2) 1 or 4
(1) Check with parts for updated versions.
(2) For 1 or 4 coding definitions. See ECM CODING  .