Skoda Workshop Service and Repair Manuals

Test table   Note t  The denominations of the bushes of the test box -V.A.G 1598 A- with adapter -V.A.G 1598/36- are identical to the contact denominations of the ABS control unit -J104- in the current flow diagram → binder „Current Flow Diagrams, Electrical Fault Finding and Fitting Locations“ t  If the measured values deviate from the specified values, perform the fault eliminating measures listed in the right part of the table → binder „Current Flow Diagrams, Electrical Fault Finding and Fitting Locations“ t  Electrical continuity tests with the measuring tool set -V.A.G 1594 A- (bridge structure). t  If the measured values only differ slightly from the specified values, clean the bushes and plugs of the test devices and measuring cables (with contact spray -G 000 700 04-) and repeat test. Before replacing the relevant components test the cables and connections more specifically for nominal values below 10 Ω, repeat the resistance measurement on the component.

Switch on measuring range: voltage measurement (20 V =)
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
1	1 + 47	Voltage supply of the hydraulic pump -V64- (terminal 30) at the control unit -J104-	l  Ignition off	10.0 - 14,5V	–  Test wiring of contact -T47a/1- via fuse S163 to battery +. –  Test wiring of contact to earth → Current flow diagrams, Electrical fault finding and Fitting locations
2	32 + 16	Voltage supply of the valves in the hydraulic unit -N55- (terminal 30) at the control unit -J104-	l  Ignition off	10.0 - 14,5V	–  Test wiring of contact -T47a/32- via fuse S162 to battery +. –  Test wiring of contact -47a/16- to earth → Current flow diagrams, Electrical fault finding and Fitting locations
3	4 + 47	Voltage supply (terminal 15) of the control unit -J104-	l  Ignition on	10.0 - 14,5V	–  Test wiring of contact -T47a/4- via fuse S13 and ignition starter switch. –  Test wiring of contact -47a/47- to earth → Current flow diagrams, Electrical fault finding and Fitting locations

Switch on measuring range: voltage measurement (20 V =) in test step 4, resistance measurement (200 Ω)/(20 MΩ) in test step 4a
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
4	41 + 47	Brake light switch -F-	l  Ignition off l  Brake pedal not actuated	0.0 - 0.5 V	–  If necessary set brake light switch → Chapter. –  Replace brake light switch → Chapter. –  Reading measured value block → Chapter, display group number 003.
			–  Brake pedal actuated	10.0 - 14.5 V	–  Check contact 1 of the brake light switch -F- to fuse S13.
4a		Brake light switch -F-	l  Measuring range 200 Ω set –  Disconnect the multi-pin connector -T47a- from the control unit -J104-		–  Test wiring for open circuit. –  Repair wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations
			–  Pull out the multi-pin connector from the brake light/brake pedal switch	max. 1.5 Ω
			–  Test wiring for open circuit
			–  Test wiring of contact 41 (control unit) to contact 1 (brake light switch)
			l  Set measuring range 20 MΩ
			–  Remove fuse S13 –  Check cables for short-circuit to positive or to earth	∞Ω

Switch on measuring range: resistance measurement (200 Ω)/(20 MΩ)
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
5	12 + 38 14 + 38 9 + 12	Jumper	l  Ignition off –  Detach multi-pin connector -T47a- –  Connect -V.A.G 1598 A- with adapter -V.A.G 1598/36- –  Test wiring for open circuit	max. 1.5 Ω	–  Test wiring of contact 9/12/14 to contact 12/38 for open circuit.

Switch on measuring range: resistance measurement (2 kΩ)
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
6	33 + 34	Resistance of the front right speed sensor -G45-	l  Ignition off	1.0...1.3 kΩ	–  Separate plug connection on speed sensor. –  Check wiring according to current flow diagram. –  Throughout the test, do not move cables → Current flow diagrams, Electrical fault finding and Fitting locations If the lines are not found to be faulty: –  Replace speed sensor -G45- → Chapter.
7	45 + 46	Resistance of the front left speed sensor -G47-	l  Ignition off	1.0...1.3 kΩ	–  Separate plug connection on speed sensor. –  Check wiring according to current flow diagram. –  Throughout the test, do not move cables → Current flow diagrams, Electrical fault finding and Fitting locations If the lines are not found to be faulty: –  Replace speed sensor -G47- → Chapter.

Switch on measuring range: resistance measurement (2kΩ)
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
8	42 + 4	Resistance of the rear right speed sensor -G44-	l  Ignition off	1.0...1.3 kΩ	–  Separate plug connection on speed sensor. –  Check wiring according to current flow diagram. –  Throughout the test, do not move cables → Current flow diagrams, Electrical fault finding and Fitting locations If the lines are not found to be faulty: –  Replace speed sensor -G47- → Chapter.
9	37 + 36	Resistance of the rear left speed sensor -G46-	l  Ignition off	1.0...1.3 kΩ	–  Separate plug connection on speed sensor. –  Check wiring according to current flow diagram. –  Throughout the test, do not move cables → Current flow diagrams, Electrical fault finding and Fitting locations If the lines are not found to be faulty: –  Replace speed sensor -G47- → Chapter.

Switch on measuring range: voltage measurement (2 V ∼)
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
10	33 + 34	Voltage signal of the front right speed sensor -G45-	l  Vehicle raised l  Ignition off –  Turn front right wheel by approx. 1 turn per sec.	Alternating voltage min. 65 mV	–  Check the installation of the wheel speed sensor and the pulse rotor. –  Check wheel speed sensor -G45- to ensure it is correctly connected and read measured value block → Chapter, display group number 001.
11	45 + 46	Voltage signal of the front left speed sensor -G47-	l  Vehicle raised l  Ignition off –  Turn front left wheel by approx. 1 turn per sec.	Alternating voltage min. 65 mV	–  Check the installation of the wheel speed sensor and the pulse rotor. –  Check wheel speed sensor -G47- to ensure it is correctly connected and read measured value block → Chapter, display group number 001.
12	42 + 43	Voltage signal of the rear right speed sensor -G44-	l  Vehicle raised l  Ignition off –  Turn rear right wheel by approx. 1 turn per sec.	Alternating voltage min. 190 mV	–  Check the installation of the wheel speed sensor and the pulse rotor. –  Check wheel speed sensor -G44- to ensure it is correctly connected and read measured value block → Chapter, display group number 001.
13	36 + 37	Voltage signal of the rear left speed sensor -G46-	l  Vehicle raised l  Ignition off –  Turn rear left wheel by approx. 1 turn per sec.	Alternating voltage min. 190 mV	–  Check the installation of the wheel speed sensor and the pulse rotor. –  Check wheel speed sensor -G46- to ensure it is correctly connected and read measured value block → Chapter, display group number 001.

Functional test: ABS warning light -K47-
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
14	-	Function of the ABS warning light -K47-	l  The fault memory was interrogated and there is no fault in the fault memory of the control unit -J104- l  Ignition off	The warning light -K47- lights up for approx. 2 seconds and goes out	If the ABS warning light does not light up: –  Check wiring according to current flow diagram. → Current flow diagrams, Electrical fault finding and Fitting locations
			l  The multi-pin connector is inserted on the control unit -J104- and locked –  Switch on ignition		–  Check dash panel insert, fault in the dash panel insert → Electrical System; Rep. gr.90

Functional test: Hand brake/brake fluid level warning light -K14/33-
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
15	-	Function of the hand brake/brake fluid level warning light -K14/33-	l  Brake fluid level is O.K. l  Ignition off l  Multi-pin connector inserted on control unit -J104- and locked –  Switch on ignition	The warning light -K14/33- lights up for approx. 2 seconds and goes out	–  Check the brake fluid level warning contact -F34- in the screw cap of the brake fluid reservoir. –  Check wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations –  Check dash panel insert, fault in the dash panel insert → Electrical System; Rep. gr.90

Functional test: ESP warning light -K155-
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
16	-	Function of the ESP warning light -K155-	l  Ignition off l  Multi-pin connector inserted on control unit -J104- and locked –  Switch on ignition	The warning light -K155- lights up for approx. 2 seconds and goes out	–  Test wiring for open circuit and for short-circuit to positive. If the warning light -K155- remains lit: –  Test the wiring of the dash panel insert for short-circuit to earth. → Current flow diagrams, Electrical fault finding and Fitting locations –  Check dash panel insert, fault in the dash panel insert. –  Check ESP button -E256-. –  Test voltage supply relay for warning light -K155-. → Current flow diagrams, Electrical fault finding and Fitting locations

Functional test: Warning light -K155- for the function of the ESP button -E256- in test step 17; voltage supply (20 V=) in test step 17a
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
17	-	Function of the TCS/ESP button -E256-	l  Ignition off l  The function of the ESP warning light -K155- was tested with test step 17 l  Multi-pin connector inserted on control unit -J104- and locked –  Switch on ignition	The warning light -K155- lights up for approx. 2 seconds and goes out
			–  Operate ESP button	Warning light -K155- comes on	–  Perform test step 18a.
			–  Operate ESP button once again	Warning light -K155- goes out
17a	16 + 13	Function of the TCS/ESP button -E256-	–  Switch off ignition –  Disconnect the multi-pin connector from the control unit -J104- –  Connect -V.A.G 1598 A- with adapter -V.A.G 1598/36- –  Switch on ignition		–  Test wiring of contact -47a/16- (control unit) to earth. –  Test wiring of contact -T47a/13- (control unit) to contact -T4f/2- (ESP button) for open circuit or short-circuit to positive or to earth.
			–  Button -E256- not pressed and warning light -K155- lights up	3,5-5,0 V	–  Test wiring for open circuit and short-circuit to positive or to earth.
			–  Button -E256- held pressed and warning light -K155- lights up	8,0-14,5 V	–  Test voltage supply of contact -T4f/1- (ESP button) via fuse S13 for open circuit → Current flow diagrams, Electrical fault finding and Fitting locations –  Replace ESP button → Electrical System; Rep. gr.96

Switch on measuring range: voltage measurement (20 V =) in test step 18, resistance measurement (200 Ω)/(20 Ω) in test step 18a
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
18	-	Earth connection and voltage supply of the steering angle sender -G85-	l  Ignition off –  Disconnect the multi-pin connector -T47a- from the control unit -J104- –  Disconnect the plug connection from the steering angle sender –  Test the voltage supply of the steering angle sender at the plug connection -T6w-		–  Test wiring of contact -T6w/4- (steering angle sender) to fuse S15 for open circuit. –  Repair wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations
			–  Test wiring between contact -T6w/4- and contact -T6w/1-	10.0-14.5V
			l  Ignition on		–  Test wiring of contact -T6w/5- (steering angle sender) to fuse S13 for open circuit → Current flow diagrams, Electrical fault finding and Fitting locations
			–  Test wiring between contact -T6w/5- and contact -T6w/1-	10.0-14.5V
18a	11 + 15	Cables for steering angle sender -G85-	l  Measuring range 200 Ω set –  Connect -V.A.G 1598 A- with adapter -V.A.G 1598/36- –  Check the following line connections for an open circuit:
			–  Wiring of contact -T6w/3- (steering angle sender) with contact -T47a/11- (control unit) –  Wiring of contact -T6w/2- (steering angle sender) with contact -T47a/15- (control unit) –  Wiring of contact -T6w/1- to earth	max. 1.5 Ω	–  Test wiring for open circuit. –  Repair wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations
			l  Measuring range 20 MQ set
			–  Remove fuse S15 –  Check cables for short-circuit to positive or to earth	∞Ω

Switch on measuring range: resistance measurement (200 Ω/20 MΩ)
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
19	-	Cables for lateral acceleration sender -G200-	l  Ignition off l  Measuring range 200 Ω set –  Disconnect the multi-pin connector -T47a- from the control unit -J104- –  Connect -V.A.G 1598 A- with adapter -V.A.G 1598/36- –  Disconnect the plug connection -T3n- from the lateral acceleration sender
			–  Test wiring for open circuit –  Wiring of contact -T3n/1- (lateral acceleration sender) with contact -T47a/6- (control unit) –  Wiring of contact -T3n/2- (lateral acceleration sender) with contact -T47a/24- (control unit)	max. 1.5 Ω	–  Test wiring for open circuit. –  Repair wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations
			–  Wiring of contact -T3n/3- (lateral acceleration sender) with contact -T47a/26- (control unit)	max. 1.5 Ω
			l  Measuring range 20 MΩ set –  Check cables for short-circuit to positive or to earth	∞Ω

Switch on measuring range: resistance measurement (200 Ω/20 MΩ)
Test step	V.A.G 1598 A bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
20	-	Cables for lateral acceleration sender -G200-	l  Ignition off l  Measuring range 200 Ω set –  Disconnect the multi-pin connector -T47a- from the control unit -J104- –  Connect -V.A.G 1598 A- with adapter -V.A.G 1598/36- –  Disconnect the plug connection -T3m- from the yaw rate sender
			–  Test wiring for open circuit		–  Test wiring for open circuit.
			–  Wiring of contact -T3m/1- (yaw rate sender) with contact -T47a/6- (control unit)	max. 1.5 Ω	–  Repair wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations
			–  Wiring of contact -T3m/2- (yaw rate sender) with contact -T47a/24- (control unit) –  Wiring of contact -T3m/3- (yaw rate sender) with contact -T47a/26- (control unit)
			l  Measuring range 20 MΩ set –  Check cables for short-circuit to positive or to earth	∞Ω

Switch on measuring range: resistance measurement (200 Ω/20 MΩ)
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
21	-	Cables for brake pressure sender -1--G201-	l  Ignition off l  Measuring range 200 Ω set –  Disconnect the multi-pin connector -T47a- from the control unit -J104- –  Connect -V.A.G 1598 A- with adapter -V.A.G 1598/36- –  Disconnect the plug connection -T30- from the brake pressure sender -1--G201-
			–  Test wiring for open circuit		–  Test wiring for open circuit.
			–  Wiring of contact -T30/1- (brake pressure sender) with contact -T47a/19- (control unit)	max. 1.5 Ω	–  Repair wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations
			–  Wiring of contact -T30/2- (brake pressure sender) with contact -T47a/20- (control unit) –  Wiring of contact -T30/3- (brake pressure sender) with contact -T47a/18- (control unit)
			l  Measuring range 20 MΩ set –  Check cables for short-circuit to positive or to earth	∞Ω

Switch on measuring range: resistance measurement (200 Ω/20 MΩ)
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
22	-	Cables for longitudinal acceleration sender -G251-	l  Ignition off l  Measuring range 200 Ω set –  Disconnect the electrical plug connection from the longitudinal acceleration sender -G251- –  Disconnect the multi-pin connector -T25a- from the control unit -J104- –  Connect test box -V.A.G 1598/21-
			–  Check the cables between the multi-pin connector of the longitudinal acceleration sender -G251- and the multi-pin connector of the control unit -J104- for open circuit	max. 1.5 Ω	–  Test the wiring according to the current flow diagram → binder „Current Flow Diagrams, Electrical Fault Finding and Fitting Locations“
			l  Measuring range 20 MΩ set –  Take out the fuse S9
			–  Check cables for short-circuit to positive or to earth	∞Ω	–  Check wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations

Switch on measuring range: resistance measurement (200 Ω/20 MΩ)
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
23	11 + 15	Data BUS cables	l  Ignition off l  Measuring range 200 Ω set –  Disconnect the multi-pin plug connections from the control units connected to the data BUS –  Connect -V.A.G 1598 A- with adapter -V.A.G 1598/33- –  Test wiring for open circuit –  to the steering angle sender –  to the engine control unit –  to the automatic gearbox control unit 1)
			–  Wiring of contact -T47a/11- (control unit) to contact -T6w/3- (steering angle sender -G85-)	max. 1.5 Ω	–  Test wiring for open circuit. –  Repair wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations
			–  Continue to the connected control units –  Wiring of contact -T47a/15- (control unit) to contact -T6w/2- (steering angle sender -G85-) –  Continue to the connected control units
			l  Measuring range 20 Ω set –  Check cables for short-circuit to positive or to earth	∞Ω

1) Only on vehicles with automatic gearbox.

Switch on measuring range: voltage measurement (20 V =)
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
24	-	Voltage supply for the vehicle system tester -V.A.G 1552-, plug connection -T16a-	l  Ignition on –  Connect the handheld multimeter -V.A.G 1526 A- with the measuring tool set -V.A.G 1594 A- to -T16a-1) –  Test wiring between contact -T6a/4- and contact -T16a/1-	10.0-14.5V	–  Test wiring of -T16a/4- to earth. –  Test wiring of -T16a/1- via S5. –  Repair wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations

1) Contact assignment of the plug connection for the voltage supply and the self-diagnosis with the vehicle system tester -V.A.G 1552- → Chapter.

Switch on measuring range: resistance measurement (200 Ω)
Test step	-V.A.G 1598 A- bushes	Test covers	l  Test conditions –  additional works	Specified value	Measures for deviations from nominal value
25	-	Resistance of the -K- cable for the self-diagnosis, plug connection -T16a-	l  Ignition off
			l  Measuring range 200 Ω set –  Disconnect the multi-pin connector -T47a- from the control unit -J104- –  Connect -V.A.G 1598 A- with adapter -V.A.G 1598/33- –  Test wiring between contact -T16a/7- and contact -T47a/39-	max. 1.5Ω	–  Test wiring of contact -T16a/7- to contact -T47a/39-. –  Repair wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations
			l  Measuring range 20 MΩ set –  Check cables for short-circuit to positive or to earth	∞Ω	–  Repair wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations