Earlier this summer my ABS light came on during a camping trip. After posting a message here, I was led to believe it was an ABS sensor issue. I used the "paperclip jumper in the OBD connector" to retrieve the fault code which was 2-13. According to the blink code list, this is a Left Rear ABS sensor gap issue.
Fault Code Location Cause
2-13 Rear Left Sensor air gap too large - sensor has
been pushed outwards by exciter ring
I removed the ABS sensor, cleaned and reinstalled it, but could not clear the code. Yesterday, I removed the ABS sensor again and performed the simple resistance/voltage checks. According to the procedure, the sensor should show a resistance of 700 ? - 2K ?, and a voltage of ? 0.93 VAC at 1 RPM.
With the sensor removed, my resistance value is about 1 K? (1.079 K? when measured on the vehicle, and 0.998 ? on the bench), which falls within the spec. When turning the hub slowly (to approximate 1 RPM), I get an AC voltage of 0.001, and the highest AC voltage reading I managed to get was 0.005 VAC when rotating the hub more quickly (probably ~ 5 RPM).
Given the voltage readings, I thought I might have a sensor problem, so I pulled the sensor from the right side, and got essentially the same readings from that one. So, both sensors seem to have very low voltage readings compared to what's listed in the procedure, but the fault code indicated a left rear sensor gap problem.
I really doubt that both sensors crapped out at the same time, so my assumption is that the sensors are OK, and I have a problem with my multimeter (e.g.: the battery needs to be replaced).
After reinserting the left ABS sensor three times without any change, I decided to swap the left and right sensors. Having done that, I took it around the block before doing the OBD blink test. Instead of getting a 2-13 code, I am now getting 2-8, and the code did not clear after I disconnected the pin jumper with the ignition on position 2.
Fault Code Location Cause
2-8 N/A No voltage to ABS solenoid valves,
faulty valve relay AB14 or wiring
I don't see any reason why swapping the left and right rear sensors would lead to this unexpected new code. I would have expected to get an air gap code either on the right rear side (where I've temporarily installed the potentially "faulty" sensor for troubleshooting), or a continued sensor air gap code for the left rear side, which would indicate that there might be a problem with the left side exciter ring, sensor bushing, or something in the left rear position.
The only other thing that I can think of is that I might have the wrong blink code list, but I don't think this is the case... I got the list I'm using from Rovers North (http://www.roversnorth.com/web/downloads/instructions/RR_ABSfault.pdf). It says it's for RR but apparently the same codes also apply to the D1, and these same codes have also been posted here in the Disco forum.
Anybody got ideas what might be wrong and/or suggestions on what to do next ?
Thanks !
Kev
Fault Code Location Cause
2-13 Rear Left Sensor air gap too large - sensor has
been pushed outwards by exciter ring
I removed the ABS sensor, cleaned and reinstalled it, but could not clear the code. Yesterday, I removed the ABS sensor again and performed the simple resistance/voltage checks. According to the procedure, the sensor should show a resistance of 700 ? - 2K ?, and a voltage of ? 0.93 VAC at 1 RPM.
With the sensor removed, my resistance value is about 1 K? (1.079 K? when measured on the vehicle, and 0.998 ? on the bench), which falls within the spec. When turning the hub slowly (to approximate 1 RPM), I get an AC voltage of 0.001, and the highest AC voltage reading I managed to get was 0.005 VAC when rotating the hub more quickly (probably ~ 5 RPM).
Given the voltage readings, I thought I might have a sensor problem, so I pulled the sensor from the right side, and got essentially the same readings from that one. So, both sensors seem to have very low voltage readings compared to what's listed in the procedure, but the fault code indicated a left rear sensor gap problem.
I really doubt that both sensors crapped out at the same time, so my assumption is that the sensors are OK, and I have a problem with my multimeter (e.g.: the battery needs to be replaced).
After reinserting the left ABS sensor three times without any change, I decided to swap the left and right sensors. Having done that, I took it around the block before doing the OBD blink test. Instead of getting a 2-13 code, I am now getting 2-8, and the code did not clear after I disconnected the pin jumper with the ignition on position 2.
Fault Code Location Cause
2-8 N/A No voltage to ABS solenoid valves,
faulty valve relay AB14 or wiring
I don't see any reason why swapping the left and right rear sensors would lead to this unexpected new code. I would have expected to get an air gap code either on the right rear side (where I've temporarily installed the potentially "faulty" sensor for troubleshooting), or a continued sensor air gap code for the left rear side, which would indicate that there might be a problem with the left side exciter ring, sensor bushing, or something in the left rear position.
The only other thing that I can think of is that I might have the wrong blink code list, but I don't think this is the case... I got the list I'm using from Rovers North (http://www.roversnorth.com/web/downloads/instructions/RR_ABSfault.pdf). It says it's for RR but apparently the same codes also apply to the D1, and these same codes have also been posted here in the Disco forum.
Anybody got ideas what might be wrong and/or suggestions on what to do next ?
Thanks !
Kev
AAahhhh !