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 9 ...................................................................................................................................................................................................  0.0 - 0.1V
Pin G1 to 18 .................................................................................................................................................................................................  0.0 - 0.1V
Pin G1 to 16 .................................................................................................................................................................................................  0.0 - 0.1V

KEY ON

Pin G1 to 9 ...................................................................................................................................................................................................  0.0 - 0.1V
Pin G1 to 18 .................................................................................................................................................................................................  0.0 - 0.1V
Pin G1 to 16 .................................................................................................................................................................................................  0.0 - 0.1V

IGNITION SWITCH

Pin 9 to 35 (ON/OFF) ........................................................................................................................................................................................  0.0 - 0.5V

MAIN RELAY SUPPLY

Pin 9 to 5

Key OFF ......................................................................................................................................................................................................  0.0 - 0.5V
Key ON .......................................................................................................................................................................................................  13 - 14.5V

HALL REFERENCE VOLTAGE

Pin 9 to 25

Key OFF ......................................................................................................................................................................................................  0.0 - 0.5V
Key ON ........................................................................................................................................................................................................  8.5 - 9.5V

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 9 to 24

68°F .............................................................................................................................................................................................................  2.4 - 3.5V
104°F - 122°F ..............................................................................................................................................................................................  1.0 - 2.5V

IDLE SWITCH

Pin 9 to 20

Closed ............................................................................................................................................................................................................  11 - 14V
Opened .........................................................................................................................................................................................................  0.0 - 1.0V

FUEL ENRICHMENT SWITCH

Pin 9 to 26

Closed ............................................................................................................................................................................................................  11 - 14V
Open .............................................................................................................................................................................................................  0.0 - 1.0V

DECELERATION FUEL CUTOFF VALVE

Pin 9 to 26

Closed ......................................................................................................................................................................................................  11.0 - 13.0V
Open .............................................................................................................................................................................................................  0.0 - 1.0V