ABS Light 2wd Cossie
#1
ABS Light 2wd Cossie
I have been searching the forums for solutions to ABS light probs. I have found a few similar probs but non of the threads have had solutions posted.
Basically, my 2wd saff's abs light is staying on constantly. comes on when ignition is turned on, doesnt go out, just stays on. now so far i have checked the following and im at a loss. Anyone had similar problems and found a solution???
- tested all abs sensors. all reading around 1000 ohms.
- Tested the fluid level sensor and its fine.
- Tested the two pin ABS plug on level sensor is fine, getting continuity on both pins and bridging the pins doesnt make the light go out.
Tried a different ABS ecu
was told cars upto 1989 had a orange relay in relay VII. mines missing, but the fusebox is not wired for this relay (mines registered 28/11/1988).
Im now at a loss. It failed its mot on the abs light, and I need to get it fixed and restested before Wedesday next week.
Any advice would be greatly appreciated
Basically, my 2wd saff's abs light is staying on constantly. comes on when ignition is turned on, doesnt go out, just stays on. now so far i have checked the following and im at a loss. Anyone had similar problems and found a solution???
- tested all abs sensors. all reading around 1000 ohms.
- Tested the fluid level sensor and its fine.
- Tested the two pin ABS plug on level sensor is fine, getting continuity on both pins and bridging the pins doesnt make the light go out.
Tried a different ABS ecu
was told cars upto 1989 had a orange relay in relay VII. mines missing, but the fusebox is not wired for this relay (mines registered 28/11/1988).
Im now at a loss. It failed its mot on the abs light, and I need to get it fixed and restested before Wedesday next week.
Any advice would be greatly appreciated
#6
Whats confusing me is the relays / wiring. I was told that upto may 1989 (the haynes manual states this too), there should be an orange relay in socket VII under the bonnet. My fuse box isnt wired for this. The I read a few posts on here that only the 4x4 had the orange fuse in VII.
I have checked under the passenger dash and there is only the two relays there as per 2wd wiring (1 purple and 1 green).
#7
i have removed the reservoir cap and the red light eluminates on the dash with the handbrake disengaged, so the level sensor is fine. I have bridged the two pins (two pin connecter) and the light stays on, confirming level sensor ok. I have tested pins 9 & 10 and do have continuity, so wiring between ecu and level senor is ok too.
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#12
Advanced PassionFord User
iTrader: (5)
1. what is the resistance between terminals 11 and 18 (ECU unplugged, ignition off) ?
2. what is the resistance between terminals 11 and 1 (ECU unplugged, ignition off) ?
3. what is the resistance between terminals 11 and 15 (ECU unplugged, ignition off) ?
4. what is the resistance between terminals 11 and 16 (ECU unplugged, ignition off) ?
5. what is the resistance between terminals 11 and 17 (ECU unplugged, ignition off) ?
6. what is the resistance between terminals 11 and 18 (ECU unplugged, ignition off) ?
7. what is the resistance between terminals 11 and 33 (ECU unplugged, ignition off) ?
8. what is the resistance between terminals 11 and 34 (ECU unplugged, ignition off) ?
9. what is the resistance between terminal 9 and earth (ECU unplugged, ignition off) ?
10. what is the resistance between terminal 10 and earth (ECU unplugged, ignition off) ?
11. what is the resistance between terminals 1 and 3 (ECU unplugged, ignition off) ?
12. what is the resistance between terminals 1 and 20 (ECU unplugged, ignition off) ?
13. what is the resistance between terminals 1 and 8 (ECU unplugged, ignition off) ?
14. what is the voltage between terminals 1 and 2 (ECU unplugged, ignition on) ?
15. with ECU unplugged and ignition off, temporarily join terminals 2 and 8 with a jumper wire. With ignition on, what is the voltage between terminals 1 and 3, and 1 and 20 ?
2. what is the resistance between terminals 11 and 1 (ECU unplugged, ignition off) ?
3. what is the resistance between terminals 11 and 15 (ECU unplugged, ignition off) ?
4. what is the resistance between terminals 11 and 16 (ECU unplugged, ignition off) ?
5. what is the resistance between terminals 11 and 17 (ECU unplugged, ignition off) ?
6. what is the resistance between terminals 11 and 18 (ECU unplugged, ignition off) ?
7. what is the resistance between terminals 11 and 33 (ECU unplugged, ignition off) ?
8. what is the resistance between terminals 11 and 34 (ECU unplugged, ignition off) ?
9. what is the resistance between terminal 9 and earth (ECU unplugged, ignition off) ?
10. what is the resistance between terminal 10 and earth (ECU unplugged, ignition off) ?
11. what is the resistance between terminals 1 and 3 (ECU unplugged, ignition off) ?
12. what is the resistance between terminals 1 and 20 (ECU unplugged, ignition off) ?
13. what is the resistance between terminals 1 and 8 (ECU unplugged, ignition off) ?
14. what is the voltage between terminals 1 and 2 (ECU unplugged, ignition on) ?
15. with ECU unplugged and ignition off, temporarily join terminals 2 and 8 with a jumper wire. With ignition on, what is the voltage between terminals 1 and 3, and 1 and 20 ?
#13
Hi mate, sorry if i have done this wrong but im no autoelectrician
I have set the multimeter ohms at 2000 and the readings are as follows:
1. what is the resistance between terminals 11 and 18 (ECU unplugged, ignition off) ? 006
2. what is the resistance between terminals 11 and 1 (ECU unplugged, ignition off) ? 0
3. what is the resistance between terminals 11 and 15 (ECU unplugged, ignition off) ? 006
4. what is the resistance between terminals 11 and 16 (ECU unplugged, ignition off) ? 003
5. what is the resistance between terminals 11 and 17 (ECU unplugged, ignition off) ? 006
6. what is the resistance between terminals 11 and 18 (ECU unplugged, ignition off) ? 002
7. what is the resistance between terminals 11 and 33 (ECU unplugged, ignition off) ? 003
8. what is the resistance between terminals 11 and 34 (ECU unplugged, ignition off) ? 1
9. what is the resistance between terminal 9 and earth (ECU unplugged, ignition off) ? 1
10. what is the resistance between terminal 10 and earth (ECU unplugged, ignition off) ? 1
11. what is the resistance between terminals 1 and 3 (ECU unplugged, ignition off) ? 001
12. what is the resistance between terminals 1 and 20 (ECU unplugged, ignition off) ? 001
13. what is the resistance between terminals 1 and 8 (ECU unplugged, ignition off) ? 069
14. what is the voltage between terminals 1 and 2 (ECU unplugged, ignition on) ? 11.63v
15. with ECU unplugged and ignition off, temporarily join terminals 2 and 8 with a jumper wire. With ignition on, what is the voltage between terminals 1 and 3 = 12.19v and 1 and 20 = 12.19v
thanks for this
I have set the multimeter ohms at 2000 and the readings are as follows:
1. what is the resistance between terminals 11 and 18 (ECU unplugged, ignition off) ? 006
2. what is the resistance between terminals 11 and 1 (ECU unplugged, ignition off) ? 0
3. what is the resistance between terminals 11 and 15 (ECU unplugged, ignition off) ? 006
4. what is the resistance between terminals 11 and 16 (ECU unplugged, ignition off) ? 003
5. what is the resistance between terminals 11 and 17 (ECU unplugged, ignition off) ? 006
6. what is the resistance between terminals 11 and 18 (ECU unplugged, ignition off) ? 002
7. what is the resistance between terminals 11 and 33 (ECU unplugged, ignition off) ? 003
8. what is the resistance between terminals 11 and 34 (ECU unplugged, ignition off) ? 1
9. what is the resistance between terminal 9 and earth (ECU unplugged, ignition off) ? 1
10. what is the resistance between terminal 10 and earth (ECU unplugged, ignition off) ? 1
11. what is the resistance between terminals 1 and 3 (ECU unplugged, ignition off) ? 001
12. what is the resistance between terminals 1 and 20 (ECU unplugged, ignition off) ? 001
13. what is the resistance between terminals 1 and 8 (ECU unplugged, ignition off) ? 069
14. what is the voltage between terminals 1 and 2 (ECU unplugged, ignition on) ? 11.63v
15. with ECU unplugged and ignition off, temporarily join terminals 2 and 8 with a jumper wire. With ignition on, what is the voltage between terminals 1 and 3 = 12.19v and 1 and 20 = 12.19v
thanks for this
#14
Advanced PassionFord User
iTrader: (5)
Re-do test 8 please, to double check the result.
If the result is the same, there seems to be a problem with either :
1. a damaged wire - namely the blue/red wire from ECU terminal 34
2.the valve block (which is on the passenger side inner wing)
3. corrosion in the valve block connector
4. a dislodged terminal in the valve block connector
Remove the 7-way connector from the valve block, and pull back the rubber boot. Have a look at the terminals and check they look OK. Pay particular attention to the blue/red wire to terminal 6. You may find numbers on the connector. If there aren't any numbers, the brown wire is terminal 1, so terminal 6 (the blue/red wire from ECU terminal 34) is the second from the end furthest from the brown wire (but watch it - there should be 2 blue/red wires at the valve block).
You can check the wire by unplugging the connector from the valve block, and checking for continuity between ECU terminal 34 and the valve block connector terminal 6. Obviously, there should be continuity, or very low resistance. If this is not the case, the wire is damaged and needs to be repaired or replaced.
To check the valve block itself, unplug the connector from the valve block, and check the resistance between valve block terminal 1 (corresponding with the brown wire in the valve block connector) and valve block terminal 6 (corresponding with the blue/red wire from ECU terminal 34). The correct result is a resistance of 3 to 7 ohms.
#16
Re-do test 8 please, to double check the result. Same = 1
If the result is the same, there seems to be a problem with either :
1. a damaged wire - namely the blue/red wire from ECU terminal 34
2.the valve block (which is on the passenger side inner wing)
3. corrosion in the valve block connector
4. a dislodged terminal in the valve block connector
Remove the 7-way connector from the valve block, and pull back the rubber boot. Have a look at the terminals and check they look OK (seem ok). Pay particular attention to the blue/red wire to terminal 6. You may find numbers on the connector. If there aren't any numbers, the brown wire is terminal 1, so terminal 6 (the blue/red wire from ECU terminal 34) is the second from the end furthest from the brown wire (but watch it - there should be 2 blue/red wires at the valve block).
You can check the wire by unplugging the connector from the valve block, and checking for continuity between ECU terminal 34 and the valve block connector terminal 6. Obviously, there should be continuity, or very low resistance. No continuity between 34 and 6! If this is not the case, the wire is damaged and needs to be repaired or replaced.
To check the valve block itself, unplug the connector from the valve block, and check the resistance between valve block terminal 1 (corresponding with the brown wire in the valve block connector) and valve block terminal 6 (corresponding with the blue/red wire from ECU terminal 34). The correct result is a resistance of 3 to 7 ohms. Reads 003 ohms
If you have a look at the tests above, tests 1 and 6 are duplicated. Typo from me. You need to do a further test :
what is the resistance between terminals 11 and 35 (ECU unplugged, ignition off) ? = 006 ohms
Does this mean that I have a broken wire betwwen terminals 34 and 6 (the blue and red cable). What does this cable do and do I just cut at both ends and run a new cable between them??
Thanks for all the help matey.. .brilliant
If the result is the same, there seems to be a problem with either :
1. a damaged wire - namely the blue/red wire from ECU terminal 34
2.the valve block (which is on the passenger side inner wing)
3. corrosion in the valve block connector
4. a dislodged terminal in the valve block connector
Remove the 7-way connector from the valve block, and pull back the rubber boot. Have a look at the terminals and check they look OK (seem ok). Pay particular attention to the blue/red wire to terminal 6. You may find numbers on the connector. If there aren't any numbers, the brown wire is terminal 1, so terminal 6 (the blue/red wire from ECU terminal 34) is the second from the end furthest from the brown wire (but watch it - there should be 2 blue/red wires at the valve block).
You can check the wire by unplugging the connector from the valve block, and checking for continuity between ECU terminal 34 and the valve block connector terminal 6. Obviously, there should be continuity, or very low resistance. No continuity between 34 and 6! If this is not the case, the wire is damaged and needs to be repaired or replaced.
To check the valve block itself, unplug the connector from the valve block, and check the resistance between valve block terminal 1 (corresponding with the brown wire in the valve block connector) and valve block terminal 6 (corresponding with the blue/red wire from ECU terminal 34). The correct result is a resistance of 3 to 7 ohms. Reads 003 ohms
If you have a look at the tests above, tests 1 and 6 are duplicated. Typo from me. You need to do a further test :
what is the resistance between terminals 11 and 35 (ECU unplugged, ignition off) ? = 006 ohms
Does this mean that I have a broken wire betwwen terminals 34 and 6 (the blue and red cable). What does this cable do and do I just cut at both ends and run a new cable between them??
Thanks for all the help matey.. .brilliant
Last edited by chrisa3; 19-11-2010 at 07:52 PM.
#19
Advanced PassionFord User
iTrader: (5)
last thing for today : ABS Sensor Cable Shielding Check
RH rear sensor : Connect ohmmeter between terminals 4 and 1 of ECU.
LH rear sensor : Connect ohmmeter between terminals 6 and 1 of ECU.
RH front sensor : Connect ohmmeter between terminals 7 and 1 of ECU.
LH front sensor : Connect ohmmeter between terminals 5 and 1 of ECU.
Result should be : Infinity
RH rear sensor : Connect ohmmeter between terminals 4 and 1 of ECU.
LH rear sensor : Connect ohmmeter between terminals 6 and 1 of ECU.
RH front sensor : Connect ohmmeter between terminals 7 and 1 of ECU.
LH front sensor : Connect ohmmeter between terminals 5 and 1 of ECU.
Result should be : Infinity
#20
last thing for today : ABS Sensor Cable Shielding Check
RH rear sensor : Connect ohmmeter between terminals 4 and 1 of ECU.
LH rear sensor : Connect ohmmeter between terminals 6 and 1 of ECU.
RH front sensor : Connect ohmmeter between terminals 7 and 1 of ECU.
LH front sensor : Connect ohmmeter between terminals 5 and 1 of ECU.
Result should be : Infinity
RH rear sensor : Connect ohmmeter between terminals 4 and 1 of ECU.
LH rear sensor : Connect ohmmeter between terminals 6 and 1 of ECU.
RH front sensor : Connect ohmmeter between terminals 7 and 1 of ECU.
LH front sensor : Connect ohmmeter between terminals 5 and 1 of ECU.
Result should be : Infinity
Just checked the above and with the multimeter set to 2000 ohms im getting a reading of 1 on all four of the above. Plug disconnected and ignition off. 1 is the reading it gives for an open circuit and 0 for a fully closed circuit.
I have also checked the abs sensors resistance from the ecu plug and getting 1009 on both rears and around 1040 on both fronts. Starting to do my head in now
chris
Last edited by chrisa3; 19-11-2010 at 11:34 PM.
#21
Advanced PassionFord User
iTrader: (5)
Seeing as there was a problem with one of the wires feeding the valve block, it could be the case that more than one of the wires was damaged, and now you've disturbed the wiring, a new fault has appeared. May be worth repeating the checks for the valve block wiring, which are :
3. what is the resistance between terminals 11 and 15 (ECU unplugged, ignition off) ?
4. what is the resistance between terminals 11 and 16 (ECU unplugged, ignition off) ?
5. what is the resistance between terminals 11 and 17 (ECU unplugged, ignition off) ?
6. what is the resistance between terminals 11 and 33 (ECU unplugged, ignition off) ?
7. what is the resistance between terminals 11 and 34 (ECU unplugged, ignition off) ?
8. what is the resistance between terminals 11 and 35 (ECU unplugged, ignition off) ?
3. what is the resistance between terminals 11 and 15 (ECU unplugged, ignition off) ?
4. what is the resistance between terminals 11 and 16 (ECU unplugged, ignition off) ?
5. what is the resistance between terminals 11 and 17 (ECU unplugged, ignition off) ?
6. what is the resistance between terminals 11 and 33 (ECU unplugged, ignition off) ?
7. what is the resistance between terminals 11 and 34 (ECU unplugged, ignition off) ?
8. what is the resistance between terminals 11 and 35 (ECU unplugged, ignition off) ?
#22
Seeing as there was a problem with one of the wires feeding the valve block, it could be the case that more than one of the wires was damaged, and now you've disturbed the wiring, a new fault has appeared. May be worth repeating the checks for the valve block wiring, which are :
3. what is the resistance between terminals 11 and 15 (ECU unplugged, ignition off) ? 006
4. what is the resistance between terminals 11 and 16 (ECU unplugged, ignition off) ? 003
5. what is the resistance between terminals 11 and 17 (ECU unplugged, ignition off) ? 006
6. what is the resistance between terminals 11 and 33 (ECU unplugged, ignition off) ? 003
7. what is the resistance between terminals 11 and 34 (ECU unplugged, ignition off) ? 003
8. what is the resistance between terminals 11 and 35 (ECU unplugged, ignition off) ? 006
3. what is the resistance between terminals 11 and 15 (ECU unplugged, ignition off) ? 006
4. what is the resistance between terminals 11 and 16 (ECU unplugged, ignition off) ? 003
5. what is the resistance between terminals 11 and 17 (ECU unplugged, ignition off) ? 006
6. what is the resistance between terminals 11 and 33 (ECU unplugged, ignition off) ? 003
7. what is the resistance between terminals 11 and 34 (ECU unplugged, ignition off) ? 003
8. what is the resistance between terminals 11 and 35 (ECU unplugged, ignition off) ? 006
#27
Getting continuity (beep / 0hms) between pin 85 on the relay plug and body earth point (ignition off)
Chris
Last edited by chrisa3; 20-11-2010 at 05:26 PM.
#29
as far as I am aware its a 2wd Ecu, Its the second ecu I have tried in the car and the other one is definately a 2wd one.
#30
Advanced PassionFord User
iTrader: (5)
Unplug ONE end (either end - doesn't matter) of the diode near to the ABS fuses/relays (grey rubber cylinder 2 inches long, brown/red wire one end, blue/green wire the other).
With ECU unplugged and ignition off, temporarily join ECU connector terminals 2 and 8 with a jumper wire. With the ignition on, what is the voltage between terminals 1 and 3 ?
With ECU unplugged and ignition off, temporarily join ECU connector terminals 2 and 8 with a jumper wire. With the ignition on, what is the voltage between terminals 1 and 3 ?
#31
Unplug ONE end (either end - doesn't matter) of the diode near to the ABS fuses/relays (grey rubber cylinder 2 inches long, brown/red wire one end, blue/green wire the other).
With ECU unplugged and ignition off, temporarily join ECU connector terminals 2 and 8 with a jumper wire. With the ignition on, what is the voltage between terminals 1 and 3 ?
With ECU unplugged and ignition off, temporarily join ECU connector terminals 2 and 8 with a jumper wire. With the ignition on, what is the voltage between terminals 1 and 3 ?
#34
Advanced PassionFord User
iTrader: (5)
Plug everything in, except one end of the diode.
Start the engine. Leave it running for a couple of minutes.
What happens to the light ?
With the engine still running, have you got 12V at the green ECU relay terminal 30 (without unplugging the relay, so just pull it out of its socket slightly until you can get your multimeter lead in there, or a short piece of wire) ?
Start the engine. Leave it running for a couple of minutes.
What happens to the light ?
With the engine still running, have you got 12V at the green ECU relay terminal 30 (without unplugging the relay, so just pull it out of its socket slightly until you can get your multimeter lead in there, or a short piece of wire) ?
#35
Plug everything in, except one end of the diode.
Start the engine. Leave it running for a couple of minutes.
What happens to the light ?
With the engine still running, have you got 12V at the green ECU relay terminal 30 (without unplugging the relay, so just pull it out of its socket slightly until you can get your multimeter lead in there, or a short piece of wire) ?
Start the engine. Leave it running for a couple of minutes.
What happens to the light ?
With the engine still running, have you got 12V at the green ECU relay terminal 30 (without unplugging the relay, so just pull it out of its socket slightly until you can get your multimeter lead in there, or a short piece of wire) ?
#37
No, are you trying to tell me something
On the plus side ITS FIXED
Used some jump leads to get the car running and ABS light is fixed woooohoooo. Must have been the dodgy wire I replaced. Jon you are one clever bloke Would never have found it without your help.. Much appreciated.
On the plus side ITS FIXED
Used some jump leads to get the car running and ABS light is fixed woooohoooo. Must have been the dodgy wire I replaced. Jon you are one clever bloke Would never have found it without your help.. Much appreciated.