Audi Workshop Service and Repair Manuals

The final control diagnosis activates the following components in the stated sequence:

    1)    Only vehicles with manual gearbox

Requirements for test on vehicles with air conditioner:

• ● Vehicle at room temperature
  (above +15 °C)
• ● Air conditioner switched on
• ● Lowest temperature setting and maximum blower speed selected

Notes:

• ◆ During the final control diagnosis, the individual control elements are only activated for 30 seconds each.
• ◆ If the final control diagnosis is to be repeated, switch off the ignition and then back on again.

Work sequence

• ‒ → Pull out oil dipstick -1- from guide tube.
• ‒ Remove engine cover -arrows-.
• ‒ Re-insert oil dipstick into guide tube.

• ‒ Connect the vehicle diagnostic, testing and information system VAS 5051 => Page 01-2, and select the vehicle system "01 - Engine electronics" from the menu. When doing this the engine should be idling.

→ Display on VAS 5051:

• ‒ Select diagnosis function "03 - Final control diagnosis" from the menu -1-

Activating exhaust gas recirculation valve

→ Display on VAS 5051:

•     A -    1st control element in test
•     1 -    Exhaust gas recirculation valve -N18

• ◆ This valve is activated at intervals for about 30 seconds (clicks) unless the test programme is deliberately advanced to the next control element by pressing the▸button.

Notes:

• ◆ The clicking of the valve is not audible on account of engine noise and a determination by touching is difficult due to engine vibration.
• ◆ When the engine is cold, activation of the valve is audible through a changed combustion sound.
• ◆ To test valve, perform the complete final control diagnosis procedure once, and then repeat with the engine not running - activation of valve is now audible.

If the valve is not actuated (does not click):

• ‒ Test exhaust gas recirculation valve -N18

=> 4-Cyl. TDI engine, Mechanics; Repair group 26; Exhaust gas recirculation system

Activating air conditioner compressor shut-off

• ‒ Press the ▸ button.

→ Display on VAS 5051:

•     A -    2nd control element in test
•     2 -    Air conditioner compressor shut-off

• ◆ The air conditioner compressor should stop running within 5 seconds (visual check), and then start and stop repeatedly every 5 seconds.

If the conditioner compressor is not switched off:

• ‒ Test air conditioner compressor shut-off
  => Page 23-119.

Note:

On vehicles without air conditioning this control element may be ignored. To continue the final control diagnostic, press the▸button.

Activating charge pressure control solenoid valve

• ‒ Press the ▸ button.

→ Display on VAS 5051:

•     A -    3rd control element in test
•     3 -    Charge pressure control solenoid valve -N75

• ◆ This valve is activated at intervals for about 30 seconds (clicks) unless the test programme is deliberately advanced to the next control element by pressing the▸button.

Notes:

• ◆ The clicking of the valve is not audible on account of engine noise and a determination by touching is difficult due to engine vibration.
• ◆ To test valve, perform the complete final control diagnosis procedure once, and then repeat with the engine not running - activation of valve is now audible.

If the valve is not actuated (does not click):

• ‒ Test charge pressure control solenoid valve -N75:

=> 4-Cyl. TDI engine, Mechanics; Repair group 21; Charge air system with turbocharger

• ‒ Press the ▸ button.

→ Display on VAS 5051:

•     A -    4th control element in test
•     4 -    Exhaust gas recirculation valve 2 -N213

• ◆ This valve is activated at intervals for about 30 seconds (clicks) unless the test programme is deliberately advanced to the next control element by pressing the▸button.

Notes:

• ◆ The clicking of the valve is not audible on account of engine noise and a determination by touching is difficult due to engine vibration.
• ◆ To test valve, perform the complete final control diagnosis procedure once, and then repeat with the engine not running. activation of valve is now audible.

If the valve is not actuated (does not click):

• ‒ Test exhaust gas recirculation valve -N18

=> 4-Cyl. TDI engine, Mechanics; Repair group 26; Exhaust gas recirculation system

Activating intake manifold flap motor

• ‒ Press the ▸ button.

→ Display on VAS 5051:

•     A -    5th control element in test
•     5 -    Intake manifold flap motor -V157

• ◆ The engine should stop

If the engine does not stop:

• ‒ Check intake manifold flap motor
  =>Page 23-24

Activating glow period warning lamp

• ‒ Press the ▸ button.

→ Display on VAS 5051:

•     A -    6th control element in test
•     6 -    Glow period warning lamp -K29

• ◆ The warning lamp is activated for about 30 seconds in intervals (flashes).

If the warning lamp is not activated (does not flash):

• ‒ Test signals to and from dash panel insert =>Page 23-136.

Activating radiator fan control

• ‒ Press the ▸ button.

→ Display on VAS 5051:

•     A -    7th control element in test
•     7 -    Radiator fan control

• ◆ The relay or radiator fan run-on control unit switches the radiator fan on and off for approx. 30 seconds in intervals unless the diagnosis is advanced to the next control element by pressing the▸button.

If the fan does not run:

• ‒ Test radiator fan and radiator fan control:

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

Activating glow plug relay

• ‒ Press the ▸ button.

→ Display on VAS 5051:

•     A -    8th control element in test
•     8 -    Glow plug relay -J52

• ◆ The glow plug relay -J52 (on central electrics panel on left side of driver's footwell, relay position 4) switches on and off for approx. 30 seconds in intervals (clicks) unless the diagnosis is advanced to the next control element by pressing the▸button.
• ◆ If the relay is switching on and off as specified, the interior light will get dimmer and brighter due to the high current draw of the glow plugs. This gives an additional indication.

If the relay does not click:

• ‒ Check glow plug relay -J52
  => Page 28-4.

Only for vehicles with manual gearbox

Activating low heat output relay

• ‒ Press the ▸ button.

→ Display on VAS 5051:

•     A -    9th control element in test
•     9 -    Low heat output relay -J359

• ◆ → The low heat output relay -J359 (under cover on left of bulkhead -item 2-) switches on and off for approx. 30 seconds in intervals (clicks) unless the diagnosis is advanced to the next control element by pressing the▸button.

If the relay does not click:

• ‒ Check low heater output relay -J359:

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

Only for vehicles with manual gearbox

Activation of high heat output relay

• ‒ Press the ▸ button.

→ Display on VAS 5051:

•     A -    10th control element in test
•     10 -    High heat output relay -J360

• ◆ → The high heat output relay -J360 (under cover on left of bulkhead -item 1-) switches on and off for approx. 30 seconds in intervals (clicks) unless the diagnosis is advanced to the next control element by pressing the▸button.
• ◆ If the relay is switching on and off as specified, the interior light will get dimmer and brighter due to the high current draw of the glow plugs. This gives an additional indication.

If the relay does not click:

• ‒ Check high heat output relay -J360:

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

All models

• ‒ Press the ▸ button.

→ Display on VAS 5051:

•     A -    Final control diagnosis is completed

• ‒ Press the ◂button to exit from function "03 - Final control diagnosis".