ABS faults

This is doing my head in now.. I need to make sure it works by mot time in 2 months cos i need the car.. i clear the faults and they just come back.. How do i check the resistance of the sensors?

3-8 = the ECU connection or wiring to inlet, isolating, hydraulic modulator solenoid valve.

think you need to start again from scratch here, there's a mish-mash of codes coming in that shouldnt be related. clear your fault codes completely and take the car for a 5 minute drive and check and list your fault codes again.

Sensor Resistance ....
the sensor circuit resistance should be between 900 and 2000 ohms. measure resistance at the sensor connector, or at the pins on the ecu connector, as follows:

1. turn ignition off

2. to measure resistance at the pins on the ecu connector, disconnect the ecu connector from the ecu

to measure resistance at the sensor connector, disconnect the sensor from the sensor extension cable

3. measure output at pins indicated below, or sensor check pins

if measurment is not between 900 and 2000 ohms, replace sensor.


front left - (9 pin connector) pins 1 and 2, (green connector) pins 5 and 8
front right - (9 pin) pins 4 and 5, (green connector) pins 4 and 9
rear left - (9 pin) pins 7 and 8, (green connector) pins 3 and 10
rear right - (9 pin) pins 3 and 6, (green connector) pins 7 and 6

Mark Disco said:

3-8 = the ECU connection or wiring to inlet, isolating, hydraulic modulator solenoid valve.

think you need to start again from scratch here, there's a mish-mash of codes coming in that shouldnt be related. clear your fault codes completely and take the car for a 5 minute drive and check and list your fault codes again.

Sensor Resistance ....
the sensor circuit resistance should be between 900 and 2000 ohms. measure resistance at the sensor connector, or at the pins on the ecu connector, as follows:

1. turn ignition off

2. to measure resistance at the pins on the ecu connector, disconnect the ecu connector from the ecu

to measure resistance at the sensor connector, disconnect the sensor from the sensor extension cable

3. measure output at pins indicated below, or sensor check pins

if measurment is not between 900 and 2000 ohms, replace sensor.


front left - (9 pin connector) pins 1 and 2, (green connector) pins 5 and 8
front right - (9 pin) pins 4 and 5, (green connector) pins 4 and 9
rear left - (9 pin) pins 7 and 8, (green connector) pins 3 and 10
rear right - (9 pin) pins 3 and 6, (green connector) pins 7 and 6

Click to expand...

Thanks for your reply mate.. I have cleared the codes and driven it a few times but the same codes come back up.. I cleared them so the only blink I got was one long flash followed by a short flash, then a long pause then long flash, short flash long pause over and over till i turn ignition off.. The 3-8 code only started to come up after I have removed and reinserted the abs pump relay, and sprayed the pump plug with wd40 as someone sugested in an earlier post.. just out of interest..... Where is the abs ecu located?

sounds like you may have a bit of **** in the plug if thats when the 3-8 fault started. pull the plug out and give it a good clean an blow-dry, might be a small lump of swarf or summat in there.

ABS ECU is apparently behind the glovebox, fitted behind the central locking ECU

Mark Disco said:

sounds like you may have a bit of **** in the plug if thats when the 3-8 fault started. pull the plug out and give it a good clean an blow-dry, might be a small lump of swarf or summat in there.

ABS ECU is apparently behind the glovebox, fitted behind the central locking ECU

Click to expand...

Cheers for that mate.. I will give that a try when i get chance...

Still not getting anywhere with this... I have fitted a new pump relay, i have checked the resistance of the front RH sensor and there is no resistance at all.. the LH one gives about 938 or somthing like that.. So I have swapped the R + L front sensors over, cleared all the codes by bridging the pins and all that.. Went for a little drive.. Checked again and still the same fault codes..

2-2
2-12
4-12
4-14
5-12
6-12

And also now 3-8 that I started to get before.. MOT due in 4 weeks and not got a clue what to do now.. I thought swapping the sensor would have changed the codes to follow the faulty sensor but its not even adding the extra codes.....

Is there no1 who can help??? Mot coming soon and not got a clue what to do now..

ive also got an ABS problem, whats the best way to remove the sensors to be cleaned, and what to use to pull them out.