My Mazda Rx8 has a problem with the EPS electronic power steering. When I start the car the steering light comes on and steering gets really hard. I have to keep the car running for 10-12 minutes then switch it off and switch it on again to make the steering light go away and steering gets normal. I’ve changed the steering torque sensor but still it’s giving the same problem
May '18
Jan '19
No
What i meant by 10 - 12 minutes was that it takes that much time for temperature gauge to get to its normal position then it works fine when I switch off the car and switch it back on.
I even got it checked with the computer, the error says there’s a problem with the steering torque sensor. The error usually goes away and car runs fine for a few days but after a week it would start doing the same shit again. I even changed the steering torque sensor but still it doesn’t work fine.
Have you actually tested the torque sensor on an oscilloscope or just replaced with unknown scrapyard part?
the RX8 steering torque sensor was updated by mazda later on. The system also reports torque sensor faults if the system voltage drops below 13V while running, usually a sign of either a bad alternator or a dumb ecu (alternator is controlled by ECU in mazda). It will also throw stupid codes like this torque sensor if the can bus goes down momentarily, check the hi and lo can line voltages and make sure that they are stable at 2.3~2.5 V - if not then you have a can bus problem - and you will have other can bus error codes also.
You will find the power plug connector for your EPS running besides the radiator, it gets clogged and thereby does not make a proper connection hence causing the issue. Plug it out, clean the terminals properly using a screwdriver + sanding paper perhaps, wd40 does the job as well though will create more problems later on. A proper solution is to replace the connector itself.
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