Skoda Workshop Service and Repair Manuals

Check wiring between the 68-pin gearbox control unit and the gearbox carry out, if: t  the final control diagnosis or t  the electrical test points to faults in or between gearbox and automatic gearbox control unit -J217 -. Test requirements: t  Ignition off. t  Connect test box e.g. -V.A.G 1598/18- only to 68-pin connector of gearbox wiring harness. t  Carry out measurements with test box -V.A.G 1598/18- outside the vehicle.

Overview of wiring, which must be unplugged for testing. 1 -  Plug connection to slide valve body → Anchor 2 -  3-pin plug connection to vehicle speed sender -G68- → Anchor 3 -  8-pin plug connection to multi-function switch -F125- → Anchor 4 -  2-pin plug connection to gearbox speed sender -G38- → Anchor Check wiring to the connector of the slide valve body

–  Disconnect connector to the top by pressing onto the lateral catches -arrows A- → Anchor, fitting position see Pos. 1.

–  Check the continuity of the wiring with the hand-held multimeter -V.A.G 1526 A - or -V.A.G 1715- between the contacts of the plug and the bushes of the test box -V.A.G 1598/18 -. Read the nominal values of the resistors in the following table.

Switch on measuring range: resistance measurement 200 Ω
Connector contact	Test box -V.A.G 1598/18 - bush	Specified value	Measures for deviations from nominal value
1	67	≤ 1,5 Ω	–  Eliminate line interruption → Current flow diagrams and Fitting locations. Check plug for: –  Contact corrosion –  Water penetration –  Leakage
2	22	≤ 1,5 Ω
3	55	≤ 1,5 Ω
4	54	≤ 1,5 Ω
5	9	≤ 1,5 Ω
6	47	≤ 1,5 Ω
7	56	≤ 1,5 Ω
8	58	≤ 1,5 Ω
10	10	≤ 1,5 Ω
12	6	≤ 1,5 Ω

Note t  If this test of the wiring does not show any unauthorised deviations, the wiring loom in the gearbox must be tested. For this step the conductor foil must be removed → Chapter. t  The slide valve body must only be replaced after a satisfactory testing of the wiring loom in the gearbox → Chapter. Check wiring to multi-function switch -F125- (8-pin plug connection)

–  Disconnect 8-pin plug of multi-function switch -F125- → Anchor, fitting position see Pos. 3.

–  Check the continuity or voltage of the wiring with the hand-held multimeter -V.A.G 1526A - or -V.A.G 1715- between the plug contacts of the 8-pin plug and the bushes of the test box -V.A.G 1598/18-. Read the nominal values of the resistors and the voltages in the following two tables.

Switch on measuring range: resistance measurement 200 Ω
Plug contact 8-pin	Test box -V.A.G 1598/18- bush	Specified value	Measures for deviations from nominal value
1	63	≤ 1,5 Ω	–  Eliminate line interruption according to current flow diagram. Check plug for: –  Contact corrosion –  Water penetration –  Leakage
2	40	≤ 1,5 Ω
3	1	≤ 1,5 Ω
4	not assigned	≤ 1,5 Ω
5	18	≤ 1,5 Ω
6	62	≤ 1,5 Ω
7	23	≤ 1,5 Ω
8	not assigned	≤ 1,5 Ω

Switch on measuring range: voltage measurement 20 V
Plug contact 8-pin	Test box -V.A.G 1598/18- bush	Specified value	Measures for deviations from nominal value
7	1	approx. battery voltage	–  Remove fuse or line interruption according to current flow diagram.

Note t  If the test step 4 of the test table → Chapter does not reach the specified values but these tests did not result in unauthorised deviations, the multi-function switch -F125- must be replaced → Chapter. t  If a deviation of the specified value has occurred during the read-out of the relevant measured value block, however the electrical test is in order, the multi-function switch -F125- must be replaced → Chapter. Check wiring to vehicle speed sender -G68- (3-pin plug connection)

–  Disconnect connector to the top by pressing onto the lateral catches -arrows B- → Anchor, fitting position see Pos. 2.

–  Check the continuity of the wiring with the hand-held multimeter -V.A.G 1526A - or -V.A.G 1715- between the contacts of the 3-pin plug and the bushes of the test box -V.A.G 1598/18-. Read the nominal values of the resistors in the following table.

Switch on measuring range: resistance measurement 200 Ω
Plug contact 3-pin	Test box -V.A.G 1598/18- bush	Specified value	Measures for deviations from nominal value
1	65	≤ 1,5 Ω	–  Eliminate line interruption according to current flow diagram. Check plug for: –  Contact corrosion –  Water penetration –  Leakage
2	20	≤ 1,5 Ω
3	43	≤ 1,5 Ω

Note If this test of the wiring does not show any unauthorised deviations, the vehicle speed sender -G68- must be replaced → Chapter. Check wiring to gearbox speed sender -G38- (2-pin plug connection)

–  Disconnect connector to the top by pressing onto the lateral catches -arrows- → Anchor, fitting position see Pos. 4.

–  Check the continuity of the wiring with the hand-held multimeter -V.A.G 1526A - or -V.A.G 1715- between the contacts of the 2-pin plug and the bushes of the test box -V.A.G 1598/18-. You can read the nominal values of the resistors in the following table.

Switch on measuring range: resistance measurement 200 Ω
Plug contact 2-pin	Test box -V.A.G 1598/18- bush	Specified value	Measures for deviations from nominal value
1	21	≤ 1,5 Ω	–  Eliminate line interruption according to current flow diagram. Check plug for: –  Contact corrosion –  Water penetration –  Leakage
2	66	≤ 1,5 Ω

Note If this test of the wiring does not show any unauthorised deviations, the gearbox speed sender -G38 - must be replaced → Chapter.