Abs problem

[Simonws2011]

Hey I have abs light on I tried to read codes with paper clips but the light is not flashing like it should is it a broken wire or abs Ecu problem any help welcome

[Cavalier342]

Which pins did you bridge?

[Robsey]

Here is a quick reminder...

This is the general listing for the later ABS Modules found in the engine bay.

(Courtesy of Andy Kirwan's Technical site - updated and edited)

To carry out a flash code diagnostic of the ABS system, short pins A and K on the diag plug and then turn on the ignition (engine not running).

If there are any stored fault codes, then the ABS Tell-tale light should flash out a two digit numerical sequence.

Early models which have the old ABS system where the control unit is located at the side of the passenger seat in a lump in the carpet do not usually have this fault code facility.

Check whether the diag plug has a wire at location K. 

16 - LH Front Solenoid ( Relay & Connections )
17 - RH Front Solenoid ( Relay & Connections )
18 - Rear Solenoids ( Relay & Connections )
19 - Solenoids Relay Circuits
25 - Faulty Sensor toothed Ring
35 - Pump Relay Circuits
37 - Stop Lamp Switch ( Pedal Switch )
39 - LH Front Speed Sensor ( Air Gap & Operation )
41- LH Front Speed Sensor ( Resistance & Connections )
42 - RH Front Speed Sensor ( Air Gap & Operation )
43 - RH Front Speed Sensor ( Resistance & Connections )
44- LH Rear Speed Sensor ( Air Gap & Operation )
45 - LH Rear Speed Sensor ( Resistance & Connections )
46 - RH Rear Speed Sensor ( Air Gap & Operation )
47- RH Rear Speed Sensor ( Resistance & Connections )
48- System Voltage High/Low ( Alternator & Battery )
55 - Faulty ECU 

[Simonws2011]

That’s my problem I have bridged A&K but am getting no codes abs light is not flashing at all

[Cavalier342]

I wonder if there is a fuse that is for the ABS system, if that's popped?

[Simonws2011]

I have checked all fuses all ok

[Robsey]

Just to be sure, I would fit new fuses anyway.

Fuses are: -
No7 - 15 amps
No 14 - 10 amps.

Although a very reliable system, you could take off the plastic cover, and check the wiring and connector pins on the module itself.

Usually it is dirty, damaged or corroded connector pins, rather than the module itself.

[Simonws2011]

Still no joy tried all that has anyone a wiring diagram for late abs system thanks

[Robsey]

X88 terminal 2 is battery live - but directly wired not via a fuse.

X89 terminal 9 is ignition live from fuse 7 via the brake pedal switch.

X89 terminal 1 and X88 terminal 4 are the abs light outputs from the module to the instrument panel.

[Simonws2011]

Thanks

[Robsey]

No problem,

Wiring wise, it looks very simple.

Most of the wires are to the wheel pick-up sensors. (8 wires)

1 wire from battery live.
1 wire from ignition live (fuse 14)
1 wire from the switched side of the brake pedal switch.
2 wires that join and go to the instruments.
2 wires to the diagnostic socket
And a couple of ground wires.

Strange how it signals an error on the dash in normal use, but not via the diagnostic test.

[Simonws2011]

It’s 1995 v6 if that makes any difference

[Robsey]

As far as I am aware, the engine size should not make any particular difference,

The only things that would affect the unit are,

The speed sensors,
The power feeds,
The grounds,
The brake switch.

The instruments and diagnostic plugs should not affect much...
unless diagnostic plug pin g is connected, but pin k is not.

Here is the pin-out in list form

X88 -
1 - black - ignition live fuse 14
2 - no colour - battery live
3 - brown - ground and screening for abs sensor wires.
4 - brown / yellow - signal to instruments and X89 pin 1

X89 -
1 - brown / yellow - signal to instruments and X88 pin 4.
2 - brown / white - left rear speed sensor return
3 - no connection
4 - blue / white - left rear speed sensor signal.
5 - brown / green - right front speed sensor return
6 - blue / red - right rear speed sensor signal
7 - brown - left front speed sensor return
8- no connection
9 - black / yellow - switched side of brake switch.
10 - blue / green - right front speed sensor signal.
11 - no connection
12 - grey - diagnostic plug pin k
13 - blue - left front speed sensor signal
14 - brown / red - right rear speed sensor signal.
15 - brown / white - diagnostic plug pin g

[Simonws2011]

Thanks for your help I appreciate it I will get another look tomorrow

[Simonws2011]

So I have checked all wire for breaks all are fine only thing I did find strange was on the 10 pin plug pin j is missing on the diagnostic plug but there is tc on the car ?

[Robsey]

Oh Chuff...I listed ABS without TC.

ABS with TC is as follows.

Here is the pin-out in list form

X88 -
1 - black - ignition live fuse 14 also Traction control pin 28
2 - no colour - battery live
3 - brown - ground and screening for abs sensor wires.
4 - brown / yellow - signal to instruments and X89 pin 1 and Traction control pin 22

X89 -
1 - brown / yellow - signal to instruments and X88 pin 4.

2 to 3 - no connection
4 - blue - left front speed sensor signal
5 - brown - left front speed sensor return
6 - blue / red - right rear speed sensor signal
7 - Blue / Green- Traction control pin 7
8- no connection
9 - brown / white - left rear speed sensor return
10 - blue / white - left rear speed sensor signal.
11 - brown / white - diagnostic plug pin g
And to Traction control pin 9. 
12 to 16 - no connection
17 - Blue - Traction control pin 25
18 - brown / red - right rear speed sensor signal.
19 - blue / red wheel speed signal (the speedometer on the instruments) - also to Traction control pin 8
20 - blue / green - right front speed sensor signal
21 - brown / green - right front speed sensor return
22 - blue / white - Traction control pin 24
23 - black / yellow - switched side of brake switch, also Traction control pin 23
24 - grey - diagnostic plug pin k

My TC schematic shows Pin J as populated, so I do not know why yours is not.
Although it says that an ABS fault can trigger a Traction Control Light.
I wonder if the reverse is true in your circumstance?

[Robsey]

Schematic for ABS with TC.

Sorry for my mistake...

[Simonws2011]

So I have went through all wiring today wire 22 blue /white to wire 9 on traction control plug has a break so will repair this and fingers crossed

[Simonws2011]

So after taking plugs apart I see that 22 blue/white is actually going to 24 tc plug is this incorrect does anyone no tv plug layout thanks

[Robsey]

Oh eck - I do need to pay more attention.
Apologies, I was in the middle of clinic between patients, when I was looking at the wiring diagrams

I really am rubbish.
If you get to VauxFest this Sunday, you can probably give me a slap across the side of the head

I obviously got confused with the brown / white - abs 11 to TC pin 9.

And the blue / white - abs 22 to TC pin 24.

UPDATE - I have corrected the post above.

[Simonws2011]

Lol only for your help I would be getting no where cheers for your help

[Robsey]

My pleasure...
Even if I am a confused old fool - lol

In my defence, the pdf version of the manual has the ABS and TC modules on different pages.

Posts above updated.

[Robsey]

Traction Control Pin-Out List
1 – brown / black – To traction control switch pin 1
2 - no connection
3 – brown / green – To traction control throttle valve actuator pin 2
4 – red / green – To Auto box pin 15
5 – grey – To C25XE engine ecu pin 38
6 – green – To C25XE engine ecu pin 43
7 – blue / green – To ABS unit X89 pin 7
8 – blue / red – To ABS unit X89 pin 19 and Speedo on instruments.
9 – brown / white – To ABS unit X89 pin 11 and diagnostic plug pin G
10 – brown / grey – To diagnostic plug pin J
11 – red / black – To C25XE engine ecu pin 54
12 – brown / black- To Auto box pin 4
13 – brown – To chassis / ground
14 to 17 - no connection
18 - red / yellow – Traction control throttle valve actuator pin 5
19 - no connection
20 – brown / red _ To traction control throttle valve actuator pin 4
21 – brown / yellow – To C25XE engine ecu pin 50
22 – brown / yellow – To ABS Unit X89 pin 1 and Instruments – ABS warning light.
23 – black / yellow – To ABS unit X89 pin 23 and switched side of brake switch.
24 – blue / white – To ABS unit X89 pin 22
25 – blue – To ABS unit X89 pin 17
26 – brown / green – To instruments – TC warning light
27 – brown / blue – To traction control throttle valve actuator pin 3
28 – black – To ABS unit X88 pin 1 and fuse 14
29 - no connection
30 – brown – To chassis / ground
31 - no connection
32 – red – To engine bay fuse 48
33 and 34 - no connection
35 – red / white – To traction control throttle valve actuator pin 1

[Simonws2011]

Problem solved abs pump replaced everything working again thanks for all your help mate cheers

[Robsey]

Good to hear that you got it sorted.

You are welcome, but it looks like you sorted the problem yourself.