Both rear ABS sensors stopped working?
05-11-2017, 04:30 AM
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Both rear ABS sensors stopped working?
Copied from 944 Turbo/s forum, hope its okay there are so many 944 forums?
Hope someone can help with our ABS diagnose... Car is a 1989 951
We did drive this car without a ABS relay for 1,5 years, so it is quite possible that more that one sensor has failed during that time. Without the relay, the ABS warning light never went out, after installing the relay the light comes on after the speed reaches 5mph or something like that.
I have read a lot of threads about testing sensors and I have tested resistance between pins in the connector to the brain, measured VAC between pins in the connector to the brain while driving and measured resistance between ground and all associated pins.
Please help me assess these results:
RESISTANCE OVER SENSORS
FR pin 11 and 21: 960Ohms
FL pin 4 and 6: 1020Ohms
RR pin 24 and 26: 890Ohms
RL pin 8 and 9: 1014Ohms
VAC WHILE DRIVING 10mph and 50mph
FR pin 11 and 21: 0,2 - 1,6VAC
FL pin 4 and 6: 0,2 - 1,0VAC
RR pin 24 and 26: 0,1 - 0,2VAC
RL pin 8 and 9: 0,1 - 0,2VAC
OHM BETWEEN PIN FROM SENSOR AND GROUND (measured with the multimeter set to 2000KOhm)
4 no connection
6 no connection
8 001
9 000
11 no connection
21 no connection
24 000
26 001
I am starting to suspect that both rear sensors are faulty. Do people agree?
I did try to remove one of the rear sensors but it was stuck to the degree I almost damaged it without it moving. Can it be turned around to help release them or do they have to come straight up? And what do I do to break them loose? Heat?
Hope someone can help with our ABS diagnose... Car is a 1989 951
We did drive this car without a ABS relay for 1,5 years, so it is quite possible that more that one sensor has failed during that time. Without the relay, the ABS warning light never went out, after installing the relay the light comes on after the speed reaches 5mph or something like that.
I have read a lot of threads about testing sensors and I have tested resistance between pins in the connector to the brain, measured VAC between pins in the connector to the brain while driving and measured resistance between ground and all associated pins.
Please help me assess these results:
RESISTANCE OVER SENSORS
FR pin 11 and 21: 960Ohms
FL pin 4 and 6: 1020Ohms
RR pin 24 and 26: 890Ohms
RL pin 8 and 9: 1014Ohms
VAC WHILE DRIVING 10mph and 50mph
FR pin 11 and 21: 0,2 - 1,6VAC
FL pin 4 and 6: 0,2 - 1,0VAC
RR pin 24 and 26: 0,1 - 0,2VAC
RL pin 8 and 9: 0,1 - 0,2VAC
OHM BETWEEN PIN FROM SENSOR AND GROUND (measured with the multimeter set to 2000KOhm)
4 no connection
6 no connection
8 001
9 000
11 no connection
21 no connection
24 000
26 001
I am starting to suspect that both rear sensors are faulty. Do people agree?
I did try to remove one of the rear sensors but it was stuck to the degree I almost damaged it without it moving. Can it be turned around to help release them or do they have to come straight up? And what do I do to break them loose? Heat?
