Control Valve Control Module, Checking

Observe all safety precautions: SAFETY PRECAUTIONS

View clean working conditions: CLEAN WORKING CONDITIONS

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

Special tools and workshop equipment required 

• Multimeter
• Wiring diagram

Test conditions 

• The Motronic Engine Control Module (ECM) - J623- fuses OK.
  Fig 1: Fuses On E-Box In Engine Compartment, Left Side

  Courtesy 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.
• Throttle valve must not be damaged or dirty.
• Coolant Temperature at least 80° C.

Function 

Control Valve operation occurs via an electric motor Control Flap Adjustment Motor -V380-, Control Valve Position Sensor -G584-, and Control Valve Control Module -J808-.

The Control Valve Control Module -J808- cannot be serviced separately and must be serviced as a unit.

Test requirements 

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

Start diagnosis 

-- Remove the engine cover with air filter. Refer to appropriate service information.

-- Disconnect the connector from the control valve control module -J808 electrical harness connector -3-.

Checking resistance

-- Using a multimeter, check the Control Valve Position Sensor -G584- at the Control Valve Control Module -J808- terminals 2 to 3 for resistance.

Specified value: 1.0 to 5.0 Ω (at 20° C)

If the specification was not obtained:

-- Replace the Control Valve Control Module -J808-. Refer to appropriate service information.

If the specification was obtained:

-- Check the voltage supply of the Control Valve Control Module -J808- to the Motronic Engine Control Module (ECM) -J623-.

Checking voltage supply and wiring

-- Switch the ignition on.

-- Using a multimeter, check the Control Valve Control Module -J808- at the electrical harness connector terminals 1 to 3 for voltage.

Specified value: at least 4.5 V

-- Switch the ignition off.

If the specification was not obtained:

Checking wiring

If the manufacturers test box is being used, perform the following step.

-- Install the test box.

If the manufacturers test box is not being used, perform the following step.

-- Remove the Motronic Engine Control Module (ECM) -J623-. Refer to appropriate service information.

-- Using a multimeter, check the Control Valve Control Module -J808- at electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J623- electrical harness connector T60 & T94 terminals for an open circuit according to the wiring diagram.

Control Valve Control Module -J808- electrical harness connector terminals	Motronic Engine Control Module (ECM) -J623- electrical connector T60 & T94 terminals or test box socket
1	T94/63
2	T94/53
3	T94/38
4	T60/48
5	T60/49

Specified value: 1.5 Ω max.

If the specification is not obtained:

-- Check the wiring for a short circuit to Battery (+), or an open circuit.

-- If necessary, repair the faulty wiring connection.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If no malfunction is detected in the wiring and if the voltage supply was not OK:

-- Replace the Motronic Engine Control Module (ECM) -J623-. Refer to appropriate service information.

Final procedures 

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .