TCS light on

[Panclan]

I have a 55 plate Seat Toledo Sport TDi, so out of warranty, last month the TCS came on permanently. I have been reading about this, most things seem to point to the ABS pump. Is there any way to confirm this, as the cost of a replacement pump is around £1000?

[Tame Technician]

There are many things that can put that light on. not just the ECU/pump failure. Any of teh 4 wheel speed sensors, logitudunal or lateral acceleromenter, steering angle sensor, even a brake light switch.

To find out what it needs, you have to have the fault memory read. This can be done by the main dealer for about 0.5hrs labour or any good autoelectrician or VAG specialist could do it also.

[Panclan]

I've had the car in at 'The Auto Pool' Langley today, the VAG.Com report is as follows;

Control Module Part Number 1K0 907 379 Q HW:1K0 907 379Q
Component and/or Version ESP FRONT MK60 0102
Software coding: 0006898
Workshop Code WSC 06402 785 00200

1 Fault Found

01435 - Brake Pressure Sensor 1 (G201)
012 - Electrical Fault in Circuit

012 - Electrical Fault in Circuit

They replaced the brake light switch, but it had no effect.

Anyone know anywhere that repairs the ABS Pump (not the controller?)

[Tame Technician]

Why did you replace the brake pedal switch??

IS the brake pressure sensor (G201) inside the ABS control unit or is it one of the screw in type screwed into the mater cylinder. I know on A2's (basically a polo) you can get it separatly and we fit quite a few.

If its a screw it type you just need to change it, then bleed the brake, clear teh fault memory and it will be fixed.

If its integral with the ABS module, then you will probably need a new one. Unless as you say it can be repaired.

[Panclan]

I didn't, the garage did, they have fixed other cars with a G201 error by changing the switch.

The sensor is inside the unit apparently

[Tame Technician]

Come to think of it, I have seen that, I'll let them off.

You usually get false G201 faults logged when the brake pedal switch is not adjusted right. The pressure sensor sees the fluid pressure go up before the brake pedal switch is triggered, so the ABS module thinks the sensor must be faulty showing pressure when in its mind the pedal hasn't been pressed.

When you work on cars all day you get a feel for it, you press the pedal a bit to far or to hard before the brake lights come on.

What they should have done was look at the MVB for the pressure sensor and see if it move up gradually as you increase pedal pressure, but they may have a code reader that cant do that.

It a real shame if they put that sensor inside the module there about £1200 the sensors (when there separate) are more like £50.

Have a ring round of auto electricians see if anyone knows how to repair them, as a main dealer we aren't allowed and change them.

I had a google and found this, not exactly the same as the one on your car, but worth an call or an email see if they do your too.

http://www.carclinicmagazine.com/audi_abs_pump___e...

PS Its not really "the pump" (the black round bit on it is the pump or pump motor) although alot of people do call it that. The assembly is actually known as the "ABS Hydraulic modulator". We just call it the module for short.

[Panclan]

I'll drop them an email, thanks for the advice.

[Panclan]

As it happens, I sent them an email 30 mins ago

[Panclan]

Anyone know if any of the following pumps will fit and work on a 2005 Toledo 5p my cars details are;

Control Module Part Number 1K0 907 379 Q HW:1K0 907 379Q
Component and/or Version ESP FRONT MK60 0102

The models I have found on a ebay auction are;

6X0 907 379 C 6X0 907 379 B 3A0 907 379 8N0 907 379 H

8N0 907 379 E 1J0 907 379 G 1C0 907 379 K

1C0 907 379 J 1J0 907 379 P 1J0 907 379 H 1C0 907 379C

6Q0 907 379 L 1C0 907 379 D 1J0 907 379 D 8E0 514 111 AB

3A0 907 379 D 1J0 907 379 F 3C0 614 095 P 3A0 907 379 E

6N0 907 379 3A0 907 375 A 358 574 217

1C0 907 379 M 1J0 907 379 Q 8E0 614 111 1C0 907 379 K

8E0 614 517 6Q0 907 379 AF 8E0 614 111 AM 820 907 379 B

1J0 907 379 C 8N0 907 379 L 1H2 614 117 1J0 907 379 AB

1C0 907 379 L 1K0 907 379 AD

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&am...

[Panclan]

As I only need the modulator or pump unit (my ABS ECU is fine), will a pump from another 05 VAG car be compatible with the ECU?

[Tame Technician]

Sorry mate dont know.

If its cheap enough to risk it, you could go for the pump/modulator that is closes to your part number and the swap the ECUs over. But it is a risk.

[Panclan]

All fixed, I had the pump replaced yesterday.

Thanks Tame Technician for your help and advice.

[Tame Technician]

Glad you got it sorted.

[SpotEyes]

dear Panclan, and all fans, my TT 2001 Quattro happen some esp problem, maybe you guys can help

1. recently the ESP(TCS) light auto light on. And will not erase when you restart the car.

2. then become sometimes you heard and feel you front axle coming a little krack sound and the ESP(TCS) light auto light on

3. then after one week become when you slow drive in the street around 15-30km/h, suddenly you hear and feel your brake working fast like ABS work. Then the ESP(TCS) light auto light on

4. Once in the autobahn, small and long right turn speed around 110km/h, and suddenly the ESP(TCS) light auto light on and caliper bite the disc hardly and let go. that time totally shock me.

as Panclan said you change the pump, whole new pump?

Please give me some advise

thanks and have a nice Xmas

[Panclan]

My TCS light was on all the time, when it was connected to a VAGCom PC it gave the error code for the brake pressure sensor switch, inside the pump.

Get the check out with a VAGcom system, it may tell you where the fault lies.