Previously had a PO500 VSS code, found bad LF ABS sensor, replaced and code gone. Also have ABS and Brake light on constant with no communication with ABS-CU. I have run powers and ground tests at ABS-CU, all tests good per flow chart. Have also tried 2 separate used ABS-CU from salvage yard. and swapped instrument cluster with known good cluster from a working vehicle. The vehicle speed signal does not come from speed sensor in transmission!!!!( that is because it has ABS, and the sensor in trans. is a dummy sensor with no terminals or connector?
If you pulled a code from the ABS system, then you have communications at the DLC. If you pulled a communications code from the PCM/cluster. You have communication there also. All the systems like this I have seen. The ABS sends the signal to the PCM. PCM sends it to the cluster. I am assuming you have electrical diagrams/pinouts. Check the continuity of the data wire from the ABS to PCM or cluster.
Randy, I have not been able to pull codes from ABS, because there is no communication. This is a very complex system as it uses a DLC1 and a DLC2 connector, neither in which I can communicate with.Not to mention one of the most ******* up wiring schematics I have ever encountered, as it bounces you from system to system.
Likewise I can not even manually pull ABS codes.
Can you post the schematics? If so, send them to [email protected]. Just a note. I have fixed many ABS systems because of the pump to body ground. It is grounded to a frame connected to the body. I run the wire directly to the body. Just another note...Brakes will still work without the ABS system.
Mitchell nor Alldata allow me access to send a wiring schematic, as I have tried many times before. As far as the ABS, we are not worried about that unless it is hindering the speedometer operation. The speedometer and cruise control are the only concerns, knowing that once speedometer is fixed, cruise will more than likely be fixed as well.
Because of no ABS data I performed a flowchart, which was symptom based, "ABS and brake light always on"
I haven't worked on the Mazdas, But I have a ford van set up like your describing. The speedo works off the wheel sensors, not the transmission. My ABS module died and took the speedo with it. It also popped the ABS and Brake lights on.
Randy, I emailed you the schematics, subject line is, Mazda MPV wiring diagrams. Thanks for the assistance
×
HiChuck, The link below is a youtube video showing how to fix the speedo on your car.....CHEERS..
Fixing The Speedometer On Your Car
not the least bit helpful in this application.
×
408 views
Usually answered in minutes!
×