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Hey guys, Looking for some advice or if anyone has run in to a similar problem. My 11 IS F seems to be having some power steering issues. On certain bumps (bridge joints, rail road tracks) the power steering light will come on and lose power steering assist. I’ve gotten it to recreate on the same bump twice now. The first time it happened, the power steering did not come back until I cycled the ignition. The second time the power steering light came on for just a quick second. The third time it has done it, the light came on for a few seconds and shut back off. It is setting a C1528 - "Motor Rotation Angle Sensor Malfunction" DTC.
So far, I have checked the connectors and ground at the rack, all seems to be okay. I haven’t checked at the module yet. I suspect a connection or wiring issue since it seems to be set off by sharp bumps. I have also tested the battery and alternator, both passed. Any thoughts?
These are the connectors and wires associated with the DTC you got. I would be checking these at both ends - the rack and the ECU - for a damaged pin. If the pins are good, the only other possibility is internal damage at the rack or the ECU.
Common issue with this platform, many end up replacing the rack, which should be the last resort in my honest opinion.
Had the same issue, but more evident on a rainy day, I also checked battery and alternator and they were good.
Solution: There is a pin for the steering rack in front of the car, I believe someone made a video putting zip ties of that connector to solve that issue as the pins do not make a solid connection.
Rather than putting zip ties, I ended up tightening the female pins on that connector so I that there is a solid click when reinserting the connector, this issue has never popped up for me again after that.
This fix is risky however as you can end up damaging the pins, however it beats paying thousands for a new rack that did not need to be replaced, your issue may be something else though checking the pins may be worth it.
Good luck. It is dangerous when you lose power steering on these v8s out of no where...
Last edited by k20trick; Nov 20, 2024 at 09:42 PM.
I'll check the connectors at the rack again this weekend. I still need to go though and do the wiggle test on everything. The rack will be the last thing replaced if it gets to the point of blindly replacing parts. Do you happen to have any idea if the power steering module on all of the 2nd gen IS models are compatible? if so, I may buy a used module off any 2nd gen to use as a test instead of paying the price for a new F module off the bat.
Last edited by jordanh07; Nov 21, 2024 at 09:03 AM.
Why do you think your module is bad? It is right below the battery...I find it hard to believe that they go bad though I have seen lose connections there too, I also believe any F model power steering module will work, though they might need reprograming, best to find someone with tech stream so that you can avoid the high costs associated with reprogramming from techs...
With your code C1528, that connector is right in front mid of the car where it rotates, I really believe it is that connector, it's worth checking and it's free to do so...You dont need to wiggle it, just unplug and see for yourself, you will find that the connection has a flaw the female pin was way wider in my case.
I truly believe it was a design flaw and the remedy was to replace the whole rack on these cars while they were still under warranty or may be I might have been the few that encountered this problem, either way it was a free easy fix.
I don't believe the module is bad at this point. I was simply asking if you knew if modules were interchangeable across all 2nd gen IS models, in the case I don't find any loose pins, or other wiring issues. The module is the most logical step if the wiring checks out. I am also under the impression it is a poor connection since it is 100% harsh abrupt bumps that set it off. Connector at the rack will be looked at again before proceeding.
They are interchangeable, but the one from the latest models is preferred for sure. The difference in feel is very noticeable. Mine is a -42 if I remember correctly. Calibrating is pretty simple with Techstream and doesn't take long at all.
Cool, that is all I needed to know. I can get a used module at a reasonable price to use as a test part if need be. I've got access to Snap On scanner so the calibration isn't a problem. Thank you!
So I got the car looked over again. I just went over everything I already looked at after work this week. When looking at the battery connections again, I found the negative battery terminal to be just a little loose, at first look it seemed adequately tight, I put a little more twisting force on it and it came loose at that point. The terminal wasn’t quite seated all of the way down on the battery post. It tightened up well. I’ll run it and see if that solved the problem. Never hurts to look twice!
So I got the car looked over again. I just went over everything I already looked at after work this week. When looking at the battery connections again, I found the negative battery terminal to be just a little loose, at first look it seemed adequately tight, I put a little more twisting force on it and it came loose at that point. The terminal wasn’t quite seated all of the way down on the battery post. It tightened up well. I’ll run it and see if that solved the problem. Never hurts to look twice!
Maybe, maybe not. I have had it happen once in the last 4,000 miles or so. Which is much less frequent that it was before tightening the battery terminal. On my daily drive, it is no longer happening on the same bumps I hit everyday that was fairly consistently causing the issue.
Hey guys, Looking for some advice or if anyone has run in to a similar problem. My 11 IS F seems to be having some power steering issues. On certain bumps (bridge joints, rail road tracks) the power steering light will come on and lose power steering assist. I’ve gotten it to recreate on the same bump twice now. The first time it happened, the power steering did not come back until I cycled the ignition. The second time the power steering light came on for just a quick second. The third time it has done it, the light came on for a few seconds and shut back off. It is setting a C1528 - "Motor Rotation Angle Sensor Malfunction" DTC.
So far, I have checked the connectors and ground at the rack, all seems to be okay. I haven’t checked at the module yet. I suspect a connection or wiring issue since it seems to be set off by sharp bumps. I have also tested the battery and alternator, both passed. Any thoughts?
my lexus p/S turn on trhow me a code c1528 but when Turn off the car and turn on again everything works perfectly I already replace the rack but still give me the same code once and awhile Check the battery and alternator working great as well
Power Steering Troubles
, have you checked the pin?
