Question about 2003 Toyota Sequoia

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Oil Pressure Not wanting to step on you, the issue with the Sequoia is really fixed by replacing the printed circuit board behind the inst cluster, thusly replacing the combination meter ECU. If you want, please comment back to the Client, he needs P/N 83291-0C012-RP if he desires a permanent repair... BTW...The "Experts not seeing comments is being looked into". I had two problems -- erradic oil pressure gage and low pressure at idle. I replaced the sender which fixed the erradic problem. Now oil pressure tracks with rpm and temp. Higher RPM - higher pressure; and higher pressure when engine is cold -- lower when warm. My issue now is that at idle and especially in drive, if the engine rpm is at ~800, the oil pressure indicater is at 1/4. If the engine rpm drops to ~700, the oil pressure gage begins a slow creep down to the bottom of the range and even a little below "L". Sometimes it will creep back up on its own or if I pull it out of drive into neutral, it will come back up. My question is, I really dont want to spend the $350+ on the ECU to fix this -- am I at risk of damaging the engine?

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  • Steve Kitchell May 24, 2009

    Can you tell me what the normal oil pressure range should be and the best way yo test normal pump operation? Also, do you know the proper idle rpm range both in and out of drive? thanks

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  • Master
  • 6,784 Answers

If this is truly a ecu issue, it will not directly affect the true nature of the pressure at all. its just a logical read out due to the malfunctioning ecu but, the pump action is normal. if the engine is not showing signs of low or high pressure and the oil level is optimal, i see no reason to replace the ecu at this time. if your funds are limited, this isn't hurting anything at this time. its a fictitous reading due to the ECu issue.

Be sure to test the oil pumps properties. if they are ok, i woudl hold off on the ECu repair.

Posted on May 21, 2009

  • Michael Masters
    Michael Masters May 24, 2009

    First test the engine oil pressure by removing the sending
    unit and temporarily installing a mechanical oil gauge. Run the engine and
    note pressure at normal engine temperature; at idle 15 to 20 pounds is okay.
    Raise the engine speed to approximately 2000 rpm. The pressure should be 40
    to 50 pounds. If the readings you get are lower, you may have a oil pump that
    needs replacing.

  • Michael Masters
    Michael Masters May 24, 2009

    To check for these conditions a manual oil pressure gauge
    is needed. Locate
    the oil pressure port near the engine oil filter. Remove the sender or switch
    and install the oil pressure gauge. Start the engine and observe the gauge.

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If you see that I write imprecisions feel free to post your comment in my solutions,

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