TT Quattro Roadster V6-3.2L (BHE) (2005)
Battery: Component Tests and General Diagnostics
Battery No-Load Voltage - Vehicles With Energy Management Control Module, Checking
Battery No-Load Voltage - Vehicles With Energy Management Control Module, Checking
NOTE:
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No-load voltage measurement for assessment of battery condition is only appropriate if it is not possible to test battery with any of the VAS 505X
class testers.
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Measuring the no-load voltage, e.g. within the prescribed maintenance and service work on vehicles in storage, determines if the battery must be
recharged.
Special tools, testers and auxiliary items required
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Multimeter VAG 1526C, Multimeter Fluke 83 or equivalent (VAG tester illustrated here for reference only).
To ensure correct measurements, follow prerequisites and procedure exactly as given:
Prerequisites
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Battery remains installed in vehicle. DO NOT disconnect battery ground cable.
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Open front hood or rear lid as appropriate for access to battery terminals.
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Manually place rear lid lock in "Closed" position to prevent illumination of luggage compartment lamp
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Manually close front hood switch where applicable to prevent activation of front hood alarm.
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Lock vehicle with remote control.
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Battery must not be discharged by electrical consumers within 2 hours prior to measurement.
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Battery must not be charged within 12 hours prior to measurement.
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Battery temperature must be at least -10 degrees C.
Procedure
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Perform any model-specific preparations necessary to gain access to battery terminals or battery jump-start terminals.
After a holding time of at least 2 hours:
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Use multimeter to measure voltage between battery terminals or between battery jump-start terminals as applicable.
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Specified value: 12.5 Volts or above = Battery OK.
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If no-load voltage is under 12.5 Volts, charge battery.
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After charging for 5 minutes, perform load test. See: Battery, Load Testing With Midtronics Diagnostic Conductance Charging Station INC-940
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If battery no-load voltage is below 11.7 Volts, battery is severely discharged.
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If no-load voltage is OK, reconnect battery.
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Follow measures required after reconnecting battery.