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‒ Check readout for battery voltage (display zone 2).
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Display zones
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1
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2
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3
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4
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Display Group 4: battery voltage with engine idling
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Display
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xxxx rpm
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xx.xxx V
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xxx.x °C
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xxx.x °C
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Indicates
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Engine speed
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Battery voltage
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Coolant temperature
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Intake air temperature
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Range
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min.: 750 rpm
max.: 6800 rpm
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min.: 0.000 V
max.: 15.000 V
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Specification
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xxxx rpm
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12.000...14.500 V
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80.0...105.0 °C
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Between ambient temperature and 90 °C
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Note
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If specification is not met => Page 28-10 Reading display zone 2
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Reading Display Group 4
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Display zone 2
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Possible cause of fault
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Fault remedy
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Readout fluctuates between
10.000 and 14.500 V
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- Loose contact
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- Test voltage supply from terminals
15 and 30 => Page 28-10
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0.000...10.000 V
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- Battery discharged/ defective
- Voltage regulator defective
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- Test voltage supply from terminals
15 and 30 => Page 28-10
Test battery
Test voltage regulator
Test alternator
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14.500...16.500 V
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- Voltage regulator defective
- Alternator defective
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- Test voltage regulator
Test alternator
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Testing voltage supply from terminals 15 and 30
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‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine control unit itself.
=> Page 24-10.
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‒ Connect hand-held multimeter V.A.G 1526 (voltage measurement range) to the following sockets on the test box:
Voltage supply from terminal 15
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Socket
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Specification
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Ignition on
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1 (earth)
+ 3 (positive)
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approx. battery voltage
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Ignition on
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2 (earth)
+ 3 (positive)
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approx. battery voltage
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Voltage supply from terminal 30
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Socket
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Specification
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Ignition off
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1 (earth)
+ 62 (positive)
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approx. battery voltage
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Ignition off
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2 (earth)
+ 62 (positive)
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approx. battery voltage
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If the specifications are not obtained:
=> Current flow diagrams, Electrical fault finding and Fitting locations binder
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