I've been tackling on and off an ABS fault with the Z3. At times I've simply found more important things to do like the sills and a recent airbag fault which is now rectified. At times it just annoys me and I go and paint the fence or something.
I'll start where most things start. It began with an intermittent fault. Normally I'd depress the brake pedal, the abs could be heard engaging rumbling and the horrific ABS light of death would illuminate. Then next time I went for a spin, all would be well and it would go out.
At some point in which I can't recall the ABS light stayed on and won't go out. Now sometimes my cheap OBD scanner will read P0500 (speed sensor A) and sometimes it won't. I've also tried a Foxwell scanner, Delphi scanner and the 'Launch' scanner which is a £700 all singing all dancing system so I'm told. Again speed sensor A. Now I've replaced all wheel sensors (or effectively used the same new sensor and gone round each corner to eliminate each sensor). Still no change. Again sometimes the diagnostic scanner will read it, but very rarely. I've unplugged the diff sensor and ran it. I have no Speedo as would expect but the scanner doesn't detect it's been removed. I've also unplugged a wheel sensor and again although showing an ABS fault on the dash nothing detected on the scanner. I've removed the module from the ABS pump. Checked connected visually on the plug and on the large terminals. Cleaned up and refitted. No change. Fuses are good. I feel I need to delve into this more electrically so I've checked for continuity on the diff sensor and tried feebly to check the wheel sensors for continuity. Now I am aware it could be the reluctor rings but is this more likely to be the module? Is there anything from my description to dictate that perhaps I should remove the module and pump to be sent away for repair or source a secondhand unit?
I'll start where most things start. It began with an intermittent fault. Normally I'd depress the brake pedal, the abs could be heard engaging rumbling and the horrific ABS light of death would illuminate. Then next time I went for a spin, all would be well and it would go out.
At some point in which I can't recall the ABS light stayed on and won't go out. Now sometimes my cheap OBD scanner will read P0500 (speed sensor A) and sometimes it won't. I've also tried a Foxwell scanner, Delphi scanner and the 'Launch' scanner which is a £700 all singing all dancing system so I'm told. Again speed sensor A. Now I've replaced all wheel sensors (or effectively used the same new sensor and gone round each corner to eliminate each sensor). Still no change. Again sometimes the diagnostic scanner will read it, but very rarely. I've unplugged the diff sensor and ran it. I have no Speedo as would expect but the scanner doesn't detect it's been removed. I've also unplugged a wheel sensor and again although showing an ABS fault on the dash nothing detected on the scanner. I've removed the module from the ABS pump. Checked connected visually on the plug and on the large terminals. Cleaned up and refitted. No change. Fuses are good. I feel I need to delve into this more electrically so I've checked for continuity on the diff sensor and tried feebly to check the wheel sensors for continuity. Now I am aware it could be the reluctor rings but is this more likely to be the module? Is there anything from my description to dictate that perhaps I should remove the module and pump to be sent away for repair or source a secondhand unit?