Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6703
ECU reported mileage reliability?
Does anyone - perhaps the helpful lurkers from LR that I've noticed are present here every now and then - have an idea how reliable the mileage figures reported by different subsystems are?
When querying the car with the IIDTool the fault log reports widely different figures from different subsystems at different dates. Particularly faults reported by ACM, BCM, DDM and IPC differ from the mileage reported by the PCM at the time of the error.
I did a forum search and what I found was a statement that "The true mileage is always logged in the transmission controller REGARDLESS of what the instrument cluster says. " mentioned in www.disco3.co.uk/forum/topic60021.html) - I understood that to mean the PCM having the true mileage.
21st Aug 2017 5:06 pm
kajtzu
Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6703
To answer myself, if there is a discrepancy between what different subsystems report in terms of total driven distance it almost always means one of the following:
- a faulty component has been replaced with an used one from another car
- someone has been very creative and made the landy look younger than what it really is
If the PCM reports a significantly higher value than other systems (like IPC and BCM) it usually means the latter rather than the former. I checked with the the Land Rover country organization and they were able to confirm that the odometer had been doctored.
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