A3 Mk2
Note
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Vehicle diagnostic, testing and information system -VAS 5051 A-, measurement mode: Multimeter, resistance measurement (0...100 Ω) | |||||||||||||
Test step | Connection on heater | Component(s) checked |
| Specification | Measures to be taken if reading does not match specification | ||||||||
3.1 | Connector B, contacts 3 and 4 | Fuel pre-heating heater element -Z66- and corresponding wiring |
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3.2 | Connector B, contact 3 and auxiliary heater housing |
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Note
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Vehicle diagnostic, testing and information system -VAS 5051 A-, measurement mode: Multimeter, resistance measurement (0..0.20 Ω) | |||||||||||||
Test step | Connection on heater | Component(s) checked |
| Specification | Measures to be taken if reading does not match specification | ||||||||
3.3 | Connector B, contacts 1 and 2 | Fuel shut-off valve -N109- and corresponding wiring |
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3.4 | Connector B, contact 1 and auxiliary heater housing |
| and fuel shut-off valve -N109- |
Note
The fuel shut-off valve -N109- closes off the fuel pipe when the auxiliary heater is switched off. After switching on the auxiliary heater (shortly before the metering pump -V54- is activated), the auxiliary heater control unit -J364- supplies power to the fuel shut-off valve -N109-; the fuel shut-off valve -N109- opens and allows fuel to flow into the auxiliary heater. |