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  1. #1

    help!! Still Oil Limp Mode. all sensors ,pressure regulator changed to new

    Done EVRYTHING possible. New Oil System. Still limp mode!! Electronics Culprit? Oil pressure perfect via pressure Gauge. Helppppppppp!! 2004 GTX 4tec supercharged


  2. #2
    steven mace's Avatar
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    ok lets get back to basics.. so you tested the pressures? What did you get? VIA gauge?

    so its a 2004 gtx.. What computer is in it? what sensor is in it?
    Depending on your computer year all its looking for is closed circuit or open circuit. very basic system..

  3. #3
    www.eastcoastpwc.net Scott's Avatar
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    What does the oil filter look like?

  4. #4
    SARTYSRNR's Avatar
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    Like to see what you find out...have had the same issue with a 05 RXT since last year,pressure within specs,changed everything at least once.No luck...must be a ecu problem or wire connection maybe.

  5. #5
    steven mace's Avatar
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    well if your oil pressure is in spec.. Hot engine idle is 20-30 PSI
    and Hot engine at 4000 to 6000 RPM's is 25-35 PSI.. are you getting that??
    Are any codes comming up?
    When it goes into limp mode, what revs can you do?

    have a read.
    OPS (Oil Pressure Switch)
    The OPS is located on the right-hand side of the
    engine, just forward of the oil filter.
    A normally open switch that will switch to ground and
    provide that ground to the ECU, if there is sufficient oil
    pressure (26-32 PSI and higher)
    and the RPM's are
    greater than 3250.
    If oil pressure is below spec, the switch will not
    activate, and the ECU will not receive a ground. As a
    result, OIL will be displayed on the cluster gauge, the
    LED will illuminate, and the buzzer will continuously
    sound. It will also be in the 2500 RPM limp home
    mode. No fault codes will be recorded!
    The same thing will happen if the switch is bad, and does not provide a ground to the ECU

  6. #6
    steven mace's Avatar
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    Troubleshooting the OPS
    -Verify Oil Pressure.
    -Verify continuity between the OPS connector and the ECU connector.
    -Ensure OPS connector is making good contact with the OPS.
    -Ensure the ECU Kostal connector is making good contact with the ECU.
    -You can fool the system by starting the engine, then grounding the OPS connector. If the
    problem goes away (and of course the oil pressure is within specs), then the wiring from the
    connector to the ECU is OK, and the switch connection or the switch itself is most likely the
    cause. (If the connector is grounded prior to starting the engine, the ECU sees a ground that
    is not supposed to be there, and Fault Code P0520 will be tripped).
    -Again, at times the problem may be hard to duplicate. So, if after troubleshooting and no
    discrepancies are found, replace the OPS.

  7. #7
    steven mace's Avatar
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    OTPS Oil Tank Pressure Switch (or as it is called in the Service Manual – OSPS - Oil
    Separator Pressure Switch).
    On the 4-TEC engine, the OTPS (Oil Tank Pressure
    Switch) is actually a crankcase pressure switch and is
    located at the front of the engine on the oil/air separator
    assembly. This switch is normally closed to ground, so in
    normal operation the switch provides a ground to the ECU.
    If the crankcase pressure exceeds approx. 4 psi, the switch
    opens, the ECU loses the ground and activates fault code
    P-1202
    after 3 to 5 minutes of running. CHK ENG will
    displayed on the cluster gauge and the engine will go into
    the 5000 RPM limp home mode.
    The same thing will happen if the OTPS is bad!

  8. #8
    steven mace's Avatar
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    Let me know what you have done and havnt.

  9. #9
    Wow. Thx guys. Taking ski out now to lake to test every situation out as mentioned above

  10. #10
    Just took Ski out..Teflon tape was Problem on rear Oil Sensor!!Had My Coast Guard buddy with me. Hes a Chief Engineer for a 250ft Cutter.Removed Teflon Tape and everything is Perfect!! Feel Dumb but a lesson Learned.Oil Switch need to be Grounded to Engine to Complete Electrical Circuit. The grounding of Wire worked perfect initially..Thanks To All out There!! You guys are Awesome!!!!Happy as can Be!!!!!

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