|
||
|
30th June 2024, 13:57 | #1 |
Newbie
Rover 75 Tourer Join Date: Oct 2021
Location: Bideford
Posts: 18
Thanks: 0
Thanked 1 Time in 1 Post
|
ABS light on, no cruise control
Hi all, I have 2003 CDT estate, last week the ABS light stayed on and I've lost cruise control. The light on the cruise control switch illuminates, as does the symbol on the dashboard.
Checked all fuses, cannot find any chaffing on the wire to the front left hand sensor and I've cleaned the blue connector with electric circuit cleaner. In order to check the voltage going to the sensor I don't have anything to make a flying lead, so I cut the 2 wires and joined them with an electrical terminal block, therefore I could check the voltage. On one wire I had 0.006 volts and on the other I had 0.17 volts!! This was with the ignition on firstly and then with the engine running. Do I need a new sensor? Would a short in the sensor itself lead to the extremely low voltage readings or have I done something wrong with my testing? Thanks as always for any help |
30th June 2024, 14:51 | #2 |
Regular poster
Still looking for a Conny Se CDTi Tourer Join Date: Mar 2011
Location: Caerphilly
Posts: 69
Thanks: 0
Thanked 0 Times in 0 Posts
|
Try measuring the voltage on the thicker wire with the sensor disconnected from the connector block to see if there is 12 v on it.
|
30th June 2024, 15:32 | #3 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,679
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Quote:
Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
|
30th June 2024, 16:14 | #4 |
Newbie
Rover 75 Tourer Join Date: Oct 2021
Location: Bideford
Posts: 18
Thanks: 0
Thanked 1 Time in 1 Post
|
Thanks both, I'll try that tomorrow and post result
|
1st July 2024, 10:34 | #5 |
Newbie
Rover 75 Tourer Join Date: Oct 2021
Location: Bideford
Posts: 18
Thanks: 0
Thanked 1 Time in 1 Post
|
Have disconnected the sensor and readings are still the same as before, both with the ignition on and also with the engine running - red wire 0.17 VOLTS and red/black wire 0.006 volts!
|
2nd July 2024, 05:44 | #6 |
Regular poster
Still looking for a Conny Se CDTi Tourer Join Date: Mar 2011
Location: Caerphilly
Posts: 69
Thanks: 0
Thanked 0 Times in 0 Posts
|
Where have you cut the wire? Towards the sensor? I would unplug the blue connector and check the voltage there if so.
|
2nd July 2024, 06:17 | #7 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,679
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Quote:
Since these are active sensors can I suggest that you perform the same test on the driver's side and compare results? Check that you are taking your measurements on the female side of the connector. It's not easy to get a reliable connection using the meter probes due to the deeply recessed terminals. You'll probably need to use a length of thin wire as an extension. Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 2nd July 2024 at 07:03.. Reason: Additions |
|
2nd July 2024, 14:37 | #8 |
Newbie
Rover 75 Tourer Join Date: Oct 2021
Location: Bideford
Posts: 18
Thanks: 0
Thanked 1 Time in 1 Post
|
The wire I cut on LHS was between the blue connector (female) and the wiring loom, therefore, isolating the sensor and testing the wiring alone.
I have just disconnected the RHS blue connector and tested the female side, this has a yellow wire (thickest) and a yellow and black wire, results very similar to LHS but opposite on the thickness of wire! - yellow wire gives 0.003 volts and the thinner yellow and black wire gives 0.018 volts. The result is the same with the ignition turned on and also with the engine running. The speedometer works as it should when driving so I am assuming a sensor fault on the LHS, but I don't understand why I'm not getting 12 volts! |
2nd July 2024, 20:35 | #9 |
Regular poster
Still looking for a Conny Se CDTi Tourer Join Date: Mar 2011
Location: Caerphilly
Posts: 69
Thanks: 0
Thanked 0 Times in 0 Posts
|
The voltage readings are negligible - basically zero. Have you tested the multimeter measuring voltage across the battery to ensure it is working?
|
2nd July 2024, 20:52 | #10 |
Newbie
Rover 75 Tourer Join Date: Oct 2021
Location: Bideford
Posts: 18
Thanks: 0
Thanked 1 Time in 1 Post
|
Yes, did that at the start of each set of readings to 'prove the multimeter'. Static battery was 12.5 volts, engine running 14.3 volts
|
|
|