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Home >> Audi >> 1994 >> S4 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Output Diagnostic Test Mode (DTM) >> Output Diagnostic Test Mode (Function 03) >> Testing
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Output Diagnostic Test Mode (Function 03): Testing

    NOTE: Blue DLC connector is not used.
  1. Connect (VAG 1551) scan tool. Indicated on display is 2 messages, on display line 1 - "VAG ON BOARD DIAGNOSTIC". On the lower display line 2 messages will alternately between: "RAPID DATA TRANSFER" and "BLINK CODE OUTPUT". If there is NO display on scan tool, verify connection for scan tool is okay. See CONNECTING SCAN TOOL (VAG 1551)  .
  2. Turn ignition on (DO NOT start).
  3. Operate (VAG 1551) scan tool according to display: Press button -1- to select "RAPID DATA TRANSFER" operating mode. Display will read - "RAPID DATA TRANSFER" "INSERT ADDRESS WORD XX".
  4. Press buttons -0- and -1- to enter "ENGINE ELECTRONICS" address word 01. Display will read - "RAPID DATA TRANSFER" "01-ENGINE ELECTRONICS".
  5. Press -Q- button to confirm input. Display will read - "RAPID DATA TRANSFER" "SCAN TOOL SENDS ADDRESS WORD 01".
  6. If display appears as shown - "RAPID DATA TRANSFER" "CONTROL MODULE DOES NOT ANSWER". Press HELP button to print list of possible malfunctions.
  7. If "CONTROL MODULE DOES NOT ANSWER" is still displayed after repairing possible malfunction, check white DLC wiring. See CHECKING WHITE DLC WIRING  under ECM VOLTAGE & GROUND CHECK. Check voltage supply to the Motronic Engine Control Module (ECM). See SYSTEM & COMPONENT TESTING article. If Diagnostic Trouble Code (DTC) 65535 is displayed, ECM is malfunctioning. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  . After repairing possible malfunction: Again press buttons -0-and-1- to enter "ENGINE ELECTRONICS" address word 01.
  8. Press -Q- button to confirm input.
  9. If one of the following displays appears as shown: Press HELP button to print list of possible malfunctions.
    • "RAPID DATA TRANSFER" "L WIRE NOT SWITCHING TO GROUND"
    • "RAPID DATA TRANSFER" "L WIRE NOT SWITCHING TO B+"
    • "RAPID DATA TRANSFER" "K WIRE NOT SWITCHING TO GROUND"
    • "RAPID DATA TRANSFER" "K WIRE NOT SWITCHING TO B+"
  10. After repairing possible malfunction: Again press buttons -0-and-1- to enter "ENGINE ELECTRONICS" address word 01. Display will read - "RAPID DATA TRANSFER " "01-ENGINE ELECTRONICS ".
  11. Press -Q- button to confirm input.
    12. NOTE: Display must show ECM identification and coding.
  12. Display indicates ECM identification and coding. Display will read (for example) - " 4AO907551AA 2.21 R5 MOTR RHV HS D" "CODING 4". For ECM identification (version). See ECM IDENTIFICATION  . Also see, ECM CODING  .
  13. Press -right arrow- button. Display will read - " RAPID DATA TRANSFER" "SELECT FUNCTION XX"
  14. Press buttons -0- and -3- to select "OUTPUT DIAGNOSTIC TEST" function 03. Display will read - "RAPID DATA TRANSFER" "OUTPUT DIAGNOSTIC TEST".
  15. Press -Q- button to confirm input. Display will read - "OUTPUT DTM" "INJECTOR CYLINDER 1-N30".
  16. At the throttle body, open and close throttle valve. See Figure . As soon as throttle valve returns to closed throttle position, fuel injector for cylinder No. 1 will cycle on and off 5 times, then Motronic ECM will automatically switch to next fuel injector in sequence.
  17. To switch to the next fuel injector WITHOUT checking it. Press -right arrow- button each time.
  18. Press -right arrow- button (display will change to the next DTM).
  19. Display will read - "OUTPUT DTM" "IDLE AIR CONTROL VALVE -N71". The idle air control valve is triggered (clicks) until switched to the next output DTM. Press -right arrow- button.
  20. Display will read - "OUTPUT DTM" "EVAP CANISTER PURGE REGULATOR VALVE". This valve is triggered (clicks) until switched to the next output DTM. Press -right arrow- button.
  21. Display will read - "OUTPUT DTM" "WASTEGATE BY-PASS REGULATOR VALVE-N75". The control module will click until the -right arrow- button is pushed to end the Output DTM checks.
  22. Press -right arrow- button. Display will read - " RAPID DATA TRANSFER" "SELECT FUNCTION XX".
  23. If function 03 "OUTPUT DIAGNOSTIC TEST MODE" is selected again, the output DTM can be repeated. If one of the components does not click, check the component and/or the control. See SYSTEM & COMPONENT TESTING - S4 article.
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