Audi A3 - Engine starts badly | BEHR HELLA
Audi
A3
Model years 1997 to 2003
All engines
Engine starts badly
If a customer complains about the above error, this could be caused by the coolant temperature sensor and / or its connection cable to the engine control unit. The customer may also complain of poor engine running. Error codes 16500, 16501 and 16502 may be output when reading out the event memory. These indicate a functional fault in the coolant temperature sensor. In this case, proceed as follows:
- Disconnect the plug connection at the engine control unit and the coolant temperature sensor.
- Check the cable for continuity. The ohmic resistance must be less than 1 Ohm.
- Check the contact pins in the plug connections for corrosion and clean if necessary.
- Check the ground connections.
If no fault is identified, check that the temperature sensor itself is functioning. This can be done by measuring the resistance between PIN 1 and 3. Three following reference values apply:
20°C = 2250 - 2950 Ohm
60°C = 530 - 675 Ohm
90°C = 190 - 270 Ohm
Important safety note
Technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only.
Reprinting, distribution, reproduction, exploitation in any form or disclosure of the contents of this document, even in part, is prohibited without our express, written approval and indication of the source. The schematic illustrations, pictures and descriptions serve only for the purposes of explanation and representation of the instructions and cannot be used as a basis for installation or assembly work. All rights reserved.
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