Audi Workshop Service and Repair Manuals

Engine Control Module: Pinout Values and Diagnostic Parameters
Voltage Measurements

35 Position ECU Plug

For Terminal ID please refer to "Powertrain Management : Computers and Control Systems : Engine Control Module : Connector Views".  See:
Diagrams/Connector Views

GROUNDS

KEY OFF

Pin G1 to 6 ...........................................................................................................................................................................................................  0.0V

KEY ON

Pin G1 to 6 ...................................................................................................................................................................................................  0.0 - 0.1V
Pin 6 to 9 ......................................................................................................................................................................................................  0.0 - 0.1V
Pin 6 to 18 ....................................................................................................................................................................................................  0.0 - 0.1V
Pin 6 to 34 ....................................................................................................................................................................................................  0.0 - 0.1V

MAIN RELAY SUPPLY

KEY OFF

Pin 34 to 35 ..........................................................................................................................................................................................................  0.0V
Pin 34 to 31 ..........................................................................................................................................................................................................  0.0V

KEY ON

Pin 34 to 35 ....................................................................................................................................................................................................  11 - 13V
Pin 34 to 31 (engine on) ...........................................................................................................................................................................  13.5 - 14.5V

REFERENCE SUPPLY

Pin 34 to 25

Key OFF ...............................................................................................................................................................................................................  0.0V
Key ON .............................................................................................................................................................................................................  > 9.0V

COOLANT TEMPERATURE SENSOR

Pin 9 to 10

68°F .............................................................................................................................................................................................................  1.0 - 2.0V
176°F - 194°F ..............................................................................................................................................................................................  0.3 - 0.7V

AIR TEMPERATURE SENSOR

Pin 23 to 24

68°F .............................................................................................................................................................................................................  1.0 - 2.0V
104°F - 122°F ..............................................................................................................................................................................................  0.7 - 1.5V

OXYGEN SENSOR

Pin 30 to 33

Key ON ........................................................................................................................................................................................................  0.4 - 0.5V
Engine Idling ................................................................................................................................................................................................  0.1 - 0.8V

IDLE SWITCH

Pin 6 to 20

Closed ............................................................................................................................................................................................................  11 - 13V
Opened .........................................................................................................................................................................................................  0.0 - 1.0V

FUEL ENRICHMENT SWITCH

Pin 6 to 26

Closed ............................................................................................................................................................................................................  11 - 13V
Open .............................................................................................................................................................................................................  0.0 - 1.0V

DECELERATION FUEL CUTOFF VALVE