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Volkswagen Workshop Service and Repair Manuals

Evaluating measured value blocks, engine codes AHU, 1Z > < Reading measured value block
Diesel direct injection and glow plug system
Measured value blocks
Display group overview engine codes AFN, AVG, AHU, ALE, 1Z

Note:

Display group overview engine code AEY .

Display group 00 (decimal displayed value)

Display zones

1

2

3

4

5

6

7

8

9

10

Mass of air drawn in

Fuel temperature

Intake manifold temperature

Coolant temperature

Atmospheric pressure (ambient pressure)

Intake manifold pressure (charge pressure)

Quantity injected

Accelerator pedal position

Commencement of injection

Engine speed

Display zones

1

2

3

4

Display group 01 -Quantity injected

Display

xxxx rpm

xx.x mg/H

x.xx V

xxx.x °C

Indicated

Engine speed

Quantity injected

Voltage supplied from slide valve sender

Coolant temperature

Display group 02 -Idling speed

Display

xxxx rpm

xxx.x %

xxx

xxx.x °C

Indicated

Engine speed

Accelerator pedal position

Operating condition1)

Coolant temperature

Display group 03 -Exhaust gas recirculation

Display

xxxx rpm

xxx mg/H

xxx mg/H

xxx %

Indicated

Engine speed

Mass of air drawn in (specified)

Mass of air drawn in (actual)

Duty cycle from exhaust gas recirculation valve

1)     1 1 1 = Conditioner compressor on

0 1 0 = Idling speed switch closed (accelerator pedal position below 17%)

1 0 0 = Idling speed boost with air conditioner switched on

Display zones

1

2

3

4

Display group 04 -Commencement of injection

Display

xxx rpm

xx.x ° BTDC/ATDC

xx.x ° BTDC/ATDC

xxx %

Indicated

Engine speed

Commencement of injection (specified)

Commencement of injection (actual)

Duty cycle from commencement of injection valve

Display group 05 -Start conditions

Display

xxxx rpm

xx.x mg/H

xx.x ° BTDC/ATDC

xxx.x °C

Indicated

Engine speed

Start quantity

Commencement of injection (actual)

Coolant temperature

Display zones

1

2

3

4

Display group 06 -Switch positions

Display

xxx km/h

xxx

xxx xx

xxx

Indicated

Speed

Brake pedal monitor1)

Cruise control system2)

Cruise control system3)

1)     0 0 1 = Brake light switch closed (Brake pedal operated)

0 1 0 = Brake pedal switch open (Brake pedal operated)

1 0 0 = Clutch pedal switch open (Clutch pedal operated)

2)     Display on vehicles ä 07.95

000 01 = Cruise control system on

000 10 = Speed accepted

001 00 = Speed accepted again

010 00 = Brake light switch closed (Brake pedal operated)

100 00 = Clutch pedal switch open (Clutch pedal operated)

2)     Display on vehicles 08.95 ä

000 01 = Cruise control system on

000 10 = Speed accepted (SET/FIX Button)

001 00 = Speed accepted again

010 00 = Brake pedal switch open (Brake pedal operated)

100 00 = Clutch pedal switch open (Clutch pedal operated)

2)     Display for engine code ALE

000001 = Cruise control system on

000101 = Speed accepted (SET button)

001001 = Speed accepted again (switch at "RES")

010001 = Brake pedal switch open (brake pedal operated)

100001 = Clutch pedal switch open (clutch pedal operated)

3)     Display for engine codes AFN, AVG, AHU, 1Z

0 = Vehicles with cruise control system

255 = Vehicles without cruise control system

Display for engine code ALE

0 = Vehicles with cruise control system, cruise control system switched off

1 = Vehicles with cruise control system, cruise control system switched on

255 = Vehicles without cruise control system

Display zones

1

2

3

4

Display group 07 -Temperatures

Display

xxx.x °C

xxx.x °C

xxx.x °C

Indicated

Fuel temperature

No display

Intake manifold temperature

Coolant temperature

Display group 08 -Injected quantity limitation

Display

xxxx rpm

xx.x mg/H

xx.x mg/H

xx.x mg/H

Indicated

Engine speed

Quantity injected (driver's requirement, (pedal position))

Injected quantity limitation (torque map)

Injection quantity limitation (opacity map)

Display group 09 -Injected quantity limitation

Display

xxxx rpm

xx.x mg/H

xx.x mg/H

x.xx V

Indicated

Engine speed

Quantity injected (cruise control system active)

Injected quantity limitation (torque limitation of automatic gearbox)

Voltage supplied from modulating piston movement sender

Display zones

1

2

3

4

Display group 10 -Air quantities

Display

xxx mg/H

xxxx mbar

xxxx mbar

xxx.x %

Indicated

Mass of air drawn in (actual)

Atmospheric pressure (ambient pressure)

Intake manifold pressure (charge pressure)

Accelerator pedal position

Display group 11 -Charge pressure control

Display

xxxx rpm

xxxx mbar

xxxx mbar

xxx %

Indicated

Engine speed

Charge pressure (specified)

Charge pressure (actual)

Duty cycle from charge pressure control valve

Display group 12 -Glow period system

Display

xxxx

xx.xx

xx.x V

xxx °C

Indicated

Not relevant

Glow period

Voltage supply from control unit

Coolant temperature

Display zones

1

2

3

4

Display group 13 -Idling speed smooth running control

Display

x.xx mg/H

x.xx mg/H

x.xx mg/H

Indicated

Quantity injected deviation No. 4 Cyl. to No. 3 Cyl.

Quantity injected deviation No. 2 Cyl. to No. 3 Cyl.

Quantity injected deviation No. 1 Cyl. to No. 3 Cyl.

No display

Evaluating measured value blocks, engine codes AHU, 1Z > < Reading measured value block