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HOMESERVICE MANUALSAUDI2008A3 BASE, 2.0 E, AUTOMATIC DCTREPAIR AND DIAGNOSISENGINE MECHANICALCOOLING FAN2.0L - GENERIC SCAN TOOL - ENGINE CODE(S): CBFA (AS OF 11.2011)ST GENERIC SCAN TOOLDIAGNOSIS AND TESTINGDIAGNOSTIC PROCEDURESLIN-BUS CIRCUIT, CHECKINGNOTES
2008 Audi A3 Base, 2.0 E, Automatic DCT

Lin-Bus Circuit, Checking: Notes

2008 Audi A3 Base, 2.0 E, Automatic DCTSECTION Notes

Special tools and workshop equipment required 

  • Multimeter.
  • Wiring diagram.

Test requirement 

  • A LIN Bus malfunction was recognized.
  • The Motronic Engine Control Module (ECM) - J623- fuses OK.
    Fig 1: Identifying Fuses On E-Box In Engine Compartment, Left Side
    GWWA97-0973Courtesy of AUDI OF AMERICA, LLC
  • Battery voltage at least 12.5 volts.
  • All electrical consumers such as, lights and rear window defroster, switched off.
  • Vehicles with automatic transmission, shift selector lever into position "P" or "N".
  • A/C switched off.
  • Ground (GND) connections between engine/transmission/chassis OK.
  • Ignition switched off.

Function 

The Engine Control Module (ECM) is connected to the Radiator Identification Sensor -G611- module by one LIN data Bus wire. Radiator I.D. and a temperature signal are sent on the LIN bus to the ECM. If the information from the RIS module was not sent or cannot be read, the ECM will store a fault code.

Test procedure 

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK 

Start diagnosis 

-- Disconnect the Radiator Identification Sensor - G611- electrical harness connector.

-- Turn the ignition switch ON.

-- Using a Multimeter, connect the red Multimeter lead to terminal 3 of the Radiator Identification Sensor -G611- sensor connector and the black lead to engine ground.

Fig 2: Identifying 3-Pin Electrical Harness Connector
GWWN24-1001Courtesy of AUDI OF AMERICA, LLC

Specified value: Battery voltage.

-- Switch the ignition off.

If the specified value was Not obtained:

-- Check the wiring connection for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

-- Check for an open or grounded circuit between terminal 3 and fuse SB15.

-- Repair the circuit and replace any open fuses.

-- Go to Final procedures

If the specified value was obtained:

NOTE:

The Motronic Engine Control Module (ECM) - J623- must remain connected for the following step.

-- Connect the Multimeter black lead to terminal 1 and the Multimeter red lead to terminal 3 of the Radiator Identification Sensor -G611- harness connector.

-- Turn the ignition switch ON.

Fig 3: Checking Camshaft Position (CMP) Sensor G40 Electrical Harness Connector Terminals 1 To 3 For Voltage
GWWN28-0197Courtesy of AUDI OF AMERICA, LLC

Specified value: Battery voltage.

-- Switch the ignition off.

-- Continue test according to the following table:

Value Cause Test
If the specified value was not obtained: Open or shorted circuit CHECKING WIRING 
If the specified value was obtained: Check reference signal circuit CHECKING WIRING 
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.