Audi Workshop Service and Repair Manuals > A3 Mk1 > Power unit | 4-Cylinder engine (2-valve), Mechanics | Engine cooling | Removing and installing parts of cooling system | Checking coolant temperature sender

Checking coolant temperature sender - radiator outletG83

Checking coolant temperature sender - radiator outlet -G83-

Special tools and workshop equipment required

t	Hand-held multimeter -V.A.G 1526 B-

t	Auxiliary measuring set -V.A.G 1594 C-

Test sequence

Fitting location: Bottom left of radiator.

Note

Checking coolant temperature sender -G62- → Rep. Gr.28.

–	Unplug electrical connector at coolant temperature sender - radiator outlet -G83-.

–	Connect multimeter (resistance measurement range) to sender.

Examples:

Area -A- shows the resistance values for the temperature range 0 … 50 °C, area -B- the values for the temperature range 50 … 100 °C.

t	30 °C is measured in range -A- and corresponds to a resistance of 1.5 .. 2.0 kΩ.

t	80 °C is measured in range -B- and corresponds to a resistance of 275 .. 375 Ω.

If specification is not obtained:

–	Renew coolant temperature sender - radiator outlet -G83-.

If reading matches specification:

–	Switch off ignition.

–	Connect adapter cable, 121-pin -V.A.G 1598/31- (test box) to connectors of wiring harness; do not connect engine control unit. Connect earth clip of test box to earth → Rep. Gr.24.

Caution

To avoid damage to the electronic components, select the required measuring range and observe test conditions before connecting the test leads.

–	Check for open circuit and short to positive or earth in the following wiring:

Connector Contact	Adapter cable, 121-pin -V.A.G 1598/31- (test box) Socket
-1-	25
-2-	47

–	Repair wiring connection if necessary.

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