Skinny Mike
Well-Known Member
Ok, a brief history.
My 2002 133000 miles td4 ES Auto has a very infrequent fault.
Most of the time it drives perfectly. But every now and then it throws a wobbler. It can go 2 to 3 weeks between faulting.
The fault.
Driving as normal, then the rev counter and speedo will bounce around, on/off. ABS TC HDC and handbrake lights will illuminate and sometimes the engine management light. But not all of them all the time, but sometimes all of them (confused yet?)
Then either everything will return to normal and driving can continue, or the gearbox will go to F4 limp mode.
So pull up, switch the engine off, count to 10, restart, and off we go. Sometimes it will be fine for another 2-3 weeks, other times it will do it every 15-20 minutes until it's left for an hour or so.
Fault codes are P0500 (vehicle speed sensor) and various can bus errors saying that the ABS cannot communicate with the tcm and there is no coms to the instrument binnacle.
Using the Icarsoft LR2 code reader shows all abs sensors are working. Communicating with the TCM is hit and miss with this reader but the VSS just reads error constantly, but I can't say if this function works or not. All coms that do work with the TCM read ok, but quite a few won't show anything. Communication to the instrument binnacle says it's not there!!!
So that's not a great help.
So does the rev and speedo work off the ABS feed or the VSS feed or both?
Does the camshaft sensor have any input into this?
I'm going to clean all the ABS sensors and the 2 multi plugs from the autobox. Also the ABS connection to the ecu.
There are no obvious cable issues or worn connectors. But as it's an old car I'm aware that it could also be a moisture issue in some way.
Any ideas or thoughts would be appreciated.
Or if you want more info just ask.
Mike
My 2002 133000 miles td4 ES Auto has a very infrequent fault.
Most of the time it drives perfectly. But every now and then it throws a wobbler. It can go 2 to 3 weeks between faulting.
The fault.
Driving as normal, then the rev counter and speedo will bounce around, on/off. ABS TC HDC and handbrake lights will illuminate and sometimes the engine management light. But not all of them all the time, but sometimes all of them (confused yet?)
Then either everything will return to normal and driving can continue, or the gearbox will go to F4 limp mode.
So pull up, switch the engine off, count to 10, restart, and off we go. Sometimes it will be fine for another 2-3 weeks, other times it will do it every 15-20 minutes until it's left for an hour or so.
Fault codes are P0500 (vehicle speed sensor) and various can bus errors saying that the ABS cannot communicate with the tcm and there is no coms to the instrument binnacle.
Using the Icarsoft LR2 code reader shows all abs sensors are working. Communicating with the TCM is hit and miss with this reader but the VSS just reads error constantly, but I can't say if this function works or not. All coms that do work with the TCM read ok, but quite a few won't show anything. Communication to the instrument binnacle says it's not there!!!
So that's not a great help.
So does the rev and speedo work off the ABS feed or the VSS feed or both?
Does the camshaft sensor have any input into this?
I'm going to clean all the ABS sensors and the 2 multi plugs from the autobox. Also the ABS connection to the ecu.
There are no obvious cable issues or worn connectors. But as it's an old car I'm aware that it could also be a moisture issue in some way.
Any ideas or thoughts would be appreciated.
Or if you want more info just ask.
Mike