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Note:
After completing the "Read measured value block" function interrogate fault memory => Page 01-8
Test table
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Group number
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Display zone
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Designation
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Test conditions
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V.A.G 1551 display specification
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Rectifying fault
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01
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1
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Measured value for ambient temperature sensor -G17-
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Displayed figure corresponds to the ambient air temperature of temperature sensor
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... °C
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- Check wiring and connections according to current flow diagram
Replace -G17-
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2
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Measured value of fresh air intake channel temperature sensor -G89-
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Displayed figure corresponds to the ambient air temperature of temperature sensor
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... °C
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- Check wiring and connections according to current flow diagram
Replace -G89-
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3
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Measured value of dash panel temperature sensor -G56-
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Displayed figure corresponds to the ambient air temperature of temperature sensor
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... °C
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- Check wiring and connections according to current flow diagram
Replace -G56-
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4
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Vehicles up to 07.95: Measured value of coolant temperature sender -G62-
Vehicles from 08.95: Measured value of air vent temperature sender -G152-
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Displayed figure corresponds to the temperature of the coolant temperature sender
Displayed figure corresponds to the ambient temperature of the air vent temperature sender
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... °C
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- Check wiring and connections according to current flow diagram
Replace -G62- or -G152-
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Group number
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Display zone
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Designation
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Test conditions
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V.A.G 1551 display specification
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Rectifying fault
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02
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1
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Speed signal from speedometer sender -G22-
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Displayed value corresponds to road speed
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... km/h
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- Check wiring and connections according to current flow diagram
Replace -G22- (only when the speedometer -G21- also does not indicate road speed)
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2
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Measured value for photo sensor for sunlight penetration -G107-
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The displayed value is dependent upon the light intensity
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0..100%
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- Check wiring and connections according to current flow diagram
Replace -G107-
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Dark
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0%
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Bright
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100%
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4
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Supply voltage (on Climatronic control unit, connection -T10a/3-)
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Displayed value corresponds to battery voltage
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..V
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- Check wiring and connections according to current flow diagram
Check alternator =>Current flow diagrams, Electrical fault finding, Fitting locations
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Group number
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Display zone
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Designation
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Test conditions
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V.A.G 1551 display specification
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Rectifying fault
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03
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2
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Switch position of air conditioner pressure switch -F129-
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- Refrigerant circuit fault-free
Condenser cooling is sufficient (2 bar/32 bar switch part closed, 16 bar switch part open)
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101)
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"00" indicated on 1551:
2 bar/32 bar switch part open, 16 bar switch part open. The refrigerant circuit is empty and must be taken to a specialist workshop.
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Cont.
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- Refrigerant circuit fault-free
Radiator fan increased output stage has switched on (2 bar/32 bar switch part closed, 16 bar switch part closed).
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111)
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"01" indicated on 1551:
2 bar/32 bar switch part open, 16 bar switch part closed. Condenser cooling insufficient (soiled); if not the refrigerant circuit is over-charged and vehicle must be taken to specialist workshop.
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1)
The left figure informs of switch part 2 bar/ 32 bar switch position, the right figure informs of switch part 16 bar switch position (1 = closed, 0 = open).
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Group number
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Display zone
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Designation
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Test conditions
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V.A.G 1551 display specification
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Rectifying fault
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03
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2
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"-0" indicated on 1551:
Checking the 2 bar/32 bar switch part is not possible at the moment, because the temperature switch is open. Condenser cooling is sufficient.
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Cont.
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"-1" indicated on 1551:
Checking the 2 bar/32 bar switch part is not possible at the moment, because the temperature switch is open. Radiator fan increased output stage has switched on.
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Group number
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Display zone
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Designation
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Test conditions
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V.A.G 1551 display specification
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Rectifying fault
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03
Cont.
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3
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Air conditioner readiness1)/engine start recognized
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- Climatronic switched on and engine started2):
Climatronic switched on and engine not started:
Climatronic switched off and engine not started:
Climatronic switched off and engine started:
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113)
103)
003)
013)
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- If the engine start is not recognized, check the wiring from terminal X to connector -T28a/21- on control unit.
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1)
Air conditioner readiness will be recognized, if voltage is present at connector -T2n/1-
2)
The magnetic coupling -N25- will only be switched on when the engine start is recognized.
3)
The left figure informs of whether Climatronic is switched on (1 = Climatronic on, 0 = Climatronic off); The right figure informs of whether the engine is started (1 = Engine started, 0 = Engine not started).
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Group number
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Display zone
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Designation
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Test conditions
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V.A.G 1551 display specification
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Rectifying fault
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03
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4
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Kick-down switch2)
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- Kick-down switch operated (full throttle); vehicles with automatic gearbox:
Kick-down switch not operated; vehicles with automatic gearbox:
Vehicles with manual gearbox:
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111)
011)
001)
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"10" indicated on 1551:
Check wiring from automatic gearbox control unit -J217- to Climatronic control unit -J255-
If necessary renew control unit -J255-
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1)
The left figure informs of the Kickdown switch position (1 = closed, 0 = open), the right figure informs on gearbox type (1 = automatic gearbox, 0 = Manual gearbox). If a gearbox, other than indicated, is installed then check wiring according to current flow diagram.
2)
Test is only possible during test drive.
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