Skoda Workshop Service and Repair Manuals > Fabia Mk1 > Engine | 1.9/47 SDI Engine, Fuel Injection | Fuel preparation system Diesel injection | Testing components

Check sender for coolant temperature G62

Check sender for coolant temperature -G62-

Special tools and workshop equipment required

t	Vehicle system tester -V.A.G 1552-

t	Diagnostic cable -V.A.G 1551/3-

t	Hand multimeter (e.g. -V.A.G 1526 A-)

t	Adapter cable set (e.g. -V.A.G 1594 A-)

t	Test box -V.A.G 1598/31-

t	Refrigerant spray (commercially available)

Test sequence

–	Connect vehicle system tester - V.A.G 1552-. Leave the engine on and select the engine control unit with “Address word” 01 → Chapter.

–	Select function 08 “read measured value block” and display group number 001.

Readout on display:

–	Read off coolant temperature in display field 4.

Specified value: the temperature reading must rise evenly

In the event of a fault the fuel temperature or value -4,5 °C is displayed instead.

If no realistic value is displayed in display field 4 or if the fuel temperature is displayed instead:

–	Select function 06 “End output” and confirm entry with Q.

–	Switch off the ignition.

Reading measured value block         1   ->

780/min    4,4 mg/s    1,800 V   20,6 °C

–	Disconnect plug -1- from Coolant temperature sender (-G62-) -2-.

–	Connect the handheld multimeter to measure the resistance on both contacts of the Coolant temperature sender (-G62-) -2-.

Nominal value see diagram:

Range -A- indicates the resistance values for the temperature range 0...50 °C, range -B- indicates the values for temperature range 50....100 °C.

Read out examples:

t	30 °C corresponds to a resistance of 1500...2000 Ω

t	80 °C corresponds to a resistance of 275...375 Ω

If the specified value is not reached:

–	Replace the Coolant temperature sender -G62-.

If the specified value is reached:

–	Connect the test box -V.A.G 1598/31 - to the wiring loom on the engine control unit → Chapter.

–	Check the following wires for interruption or short-circuit to earth or positive:

–	Also test the wires for short-circuits.

–	If necessary eliminate wire interruption or short-circuit.

If the lines are not found to be faulty:

–	Replace the Diesel direct injection system control unit -J248- → Chapter.

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