Skoda Workshop Service and Repair Manuals > Octavia Mk1 > Drive unit | 1.4 ltr./44 kW Engine, Simos 3PB Fuel Injection and Ignition System | Mixture preparation system, electronic inj.,Gas | Repairing the injection system

Coolant temperature senderG62

Coolant temperature sender -G62-

Special tools and workshop equipment required

t	Vehicle system tester -V.A.G 1552- with cable -V.A.G 1551/3-

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

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

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

t	Current flow diagram

Test sequence

–	Connect vehicle system tester -V.A.G 1552- and select engine electronics (address word 01); engine runs in idle → Chapter.

Readout on display:

–	Enter 08 for the function “Read measured value block” and confirm entry with the Q.

Vehicle system test                 HELP

Select function XX

Readout on display:

–	Enter 004 for the display group 4 and confirm entry with the Q key.

Readout on display:

Reading measured value block

Enter display group number    XXX

(1...4 = display fields)

–	Read off coolant temperatur value indicated in display field 3.

If implausible value appears in the display:

–	Enter function 06 “End output” and confirm entry with the Q key.

–	Switch off ignition.

Reading measured value block  4   ->

780 rpm    13.8 V    85,0 °C     28.5 °C

–	Disconnect the 4-pin plug -1- from the coolant temperature sender -G62 --2-.

–	Connect multimeter for resistance measurement to contacts 1 and 3 of the coolant temperature sender -G62--2-.

Specified value:

The nominal value in field -A- applies for the temperature range 0...50 °C, nominal value in field -B- applies for the temperature range 50...100 °C.

Example:

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 coolant temperature sender -G62-.

If the specification is achieved:

–	Connect the test box -V.A.G 1598/31- to the wiring loom on the engine control unit → Chapter. The engine control unit is not connected.

–	Test the cables for short circuit to positive or negative and for interruption.

4-pin plug on wiring loom, contact	Test box -V.A.G 1598/31-, bush
1	104
3	83

Cable resistance max. 1.5 Ω

–	If necessary eliminate line interruption or short-circuit.

If the lines are not found to be faulty:

–	Replacing engine control unit → Chapter.

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