Skoda Workshop Service and Repair Manuals

Testing Fuel temperature sender -G81- 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- Test sequence –  Connect vehicle system tester - V.A.G 1552-. Switch on the ignition (engine cool and standing) and select the engine control unit with “Address word” 01 → Chapter. –  Select function 08 “Read measured value block” and display group number 007.

Readout on display: –  Observe display in display field 1.    Specified value: approx. ambient temperature In the event of a fault a replacement temperature of -5.4 °C is displayed. If no realistic value is displayed in display field 1 or if a replacement temperature of -5.4 °C is displayed instead: –  Select function 06 “End output” and confirm entry with Q. –  Switch off the ignition.

Reading measured value block 7 -> 15.4 °C 15.9 °C 16.7 °C

–  Remove engine cover.    To do so pull the front and rear engine cover upwards with a sudden motion.

–  Disconnect the plug connection -arrow- from the injection pump. –  Connect the handheld multimeter to measure the resistance on contacts 4 and 7 of plug -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 injection pump → Chapter. 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:

Connector -1-, contact	Test box -V.A.G 1598/31-, bush
4	103
7	111

–  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.