Volkswagen Workshop Service and Repair Manuals > Polo Mk3 > Running gear self-diagnosis for ABS | Self diagnosis, V.A.G Inspection Service | Electrical check of ABS, ABS/EDL ITT Mark 20 GI and ITT Mark 20 IE | Multi-pin connector with contact assignment

Running gear self-diagnosis for ABS

Electrical check of ABS, ABS/EDL ITT Mark 20 GI and ITT Mark 20 IE

Multi-pin connector with contact assignment

All contacts not listed are currently not assigned and must never be connected to other components!

→ Contact assignment of connectors for voltage supply and self-diagnosis with the fault reader V.A.G 1551

Contact 4	=	Earth (terminal 31)
Contact 16	=	Positive (terminal 30)
Contact 7	=	K wire to contact 7 of multi-pin connector T25 of control unit -J104

→ Contact assignment of connector T25 wiring loom/control unit - J104


Contact	Wiring connection to component ...
1	=>	Front left speed sensor -G47
2	=>	Front left speed sensor -G47
3	=>	Vacant
4	=>	Voltage supply terminal X
5	=>	Rear left speed sensor -G46
6	=>	Rear left speed sensor -G46
7	=>	Connector T16/7, K wire
8	=>	Earth connection in engine compartment wiring harness
9	=>	Voltage supply from battery +
10	=>	Vacant
11	=>	Vacant
12	=>	Vacant

Contact	Wiring connection to component ...
13	=>	Vacant
14	=>	Coding bridge to contact 21
15	=>	Vacant
16	=>	ABS warning lamp activation
17	=>	Vacant
18	=>	Brake light switch -F-
19	=>	Front right speed sensor -G45
20	=>	Front right speed sensor -G45
21	=>	Coding bridge to contact 14
22	=>	Rear right speed sensor -G44
23	=>	Rear right speed sensor -G44
24	=>	Earth point left in engine compartment and earth connection in engine compartment wiring harness
25	=>	Voltage supply from battery +

Test step overview


Component to be tested
Voltage supply for hydraulic pump -V64- to control unit -J104		- Perform test step 1
Voltage supply for valves in hydraulic unit -N55- to control unit -J104		- Perform test step 2
Voltage supply (terminal X) to control unit -J104		- Perform test step 3
Function of brake light switch -F		- Perform test step 4
Resistance of front right speed sensor -G45		- Perform test step 5
Resistance of front left speed sensor -G47		- Perform test step 6
Resistance of rear right speed sensor -G44		- Perform test step 7
Resistance of rear left speed sensor -G46		- Perform test step 8
Voltage signal of front right speed sensor -G45		- Perform test step 9
Voltage signal of front left speed sensor -G47		- Perform test step 10


Component to be tested
Voltage signal of rear right speed sensor -G44		- Perform test step 11
Voltage signal of rear left speed sensor -G46		- Perform test step 12
Coding bridge		- Perform test step 13
Voltage supply for V.A.G 1551, connector T16		- Perform test step 14
Resistance of K wire for self-diagnosis, connector T16		- Perform test step 15
Function of ABS warning lamp -K47		- Perform test step 16
Function of brake system warning lamp -K118		- Perform test step 17
Function of hydraulic pump -V64		- Perform test step 18

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