Question about 1996 Jeep Grand Cherokee

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"Check gauges" light stays on and oil pressure gauge needle does not move.

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  • Jeep Master
  • 6,982 Answers

Make sure the sender for the gauge is plugged in and if it is, replace the sender. That should correct the problem. If not you will need to go deeper into the wiring.

Posted on Sep 15, 2010

  • traci_stanek Oct 08, 2010

    where is the sending gauge???

  • Richard Scordino Oct 08, 2010

    Oil pressure sending unit is located near the oil filter. It is cylindrical with a rounded top with either one or two wires plugged into the top.

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96 Chevy blazer how do I get out of safe mode ran low on oil now runs an drives but won't let car go fast past 2000rpms


The computing system on your vehicle has no safe mode for running low on oil . The only thing that will happen is the check gauges light will come on.
The oil pressure gauge is an analog device that is located in the IPC. The oil pressure gauge is operated directly by the oil pressure sensor circuit. As the engine oil pressure changes, the resistance of the sensor and the current flow in the oil pressure gauge changes. The current flow in the oil pressure gauge causes the needle to move in order to appropriately display the engine oil pressure. A sensor resistance of 1ohms will display as 0 kPa (0 PSI) and a resistance of 88 ohms will display as 80 kPa (80 PSI ). The IPC also monitors the oil pressure sensor circuit and interprets the current flow in this circuit in order to determine when the engine oil pressure is too low. If the oil pressure is too low, the check gauges tell tale will turn on. The oil pressure sender is located on the left side of the 2.2L. The 4.3L engine, oil pressure sender is located at the top left side, near the distributor/high voltage switch.
Try disconnecting the battery cables an hold them together for ten minutes , reset ECM !

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My check gauges light is on, oil hands goes over to zero, moves up, light goes off, when it drops back to zero, gauge light comes back on.


Well the warning light is supposed to come on if any of the gauges display a dangerous condition, such as no oil pressure.
You may have a faulty sending unit for the gauge, or a wiring problem, or the engine may actually be loosing oil pressure when the gauge drops.
You could replace the sending unit as a test, or have someone check the oil pressure with a mechanical gauge.

Dec 13, 2012 | 2001 Jeep Grand Cherokee

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My oil pressure gauge stays on after car is off. All other gauge needles go completely down. When I turn my car to idle (not on though) the oil pressure needle goes down but the rest of the needles for the...


I had an awful Ford that did that. The fuel gauge stayed up showing the crooks how much diesel was in the tank and the temp and oil gauge stayed on the last reading but returned to zero when the ignition was switched on when cold.

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Oil gauge on 91 Dodge Dakota suddenly running very high but plenty of oil


have a mechanic test the oil pressure with a mechanical gauge
it is more than likely that the electric sender unit has failed and is sticking internally
the tic noise could be a relay working from an intermittent power supply or bad ground

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Check gauge light on and oil gauge to 80


i think the oil pressure relief wall is abnormally tight resulting relief occurring at high pressure.oil pressure gauge needle position might have disturbed

Mar 04, 2012 | 2000 Jeep Cherokee

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I;ve lost oil pressure the needle stay's down while driving, is the oil pump bad or going bad? is it located in the oil pan or the front of the 4.6L MOTOR?


If the needle is staying down and the motor is not knocking then the gauge is probably bad. If you run the engine with no oil pressure, then it will not last long. It will start knocking and ruin the engine. But yes the oil pump in in the oil pan. There is also a oil pressure sending unit that could be bad. It is located on the back of the engine.

Jan 03, 2011 | 2000 Ford Expedition

1 Answer

Where is the oil pressure switch/sendor located?


Oil pressure can be checked at the sending unit passage with an externally mounted mechanical oil pressure gauge. To get accurate results from the test, make sure you follow the manufacturer's recommendations and compare your findings to specifications.
Testing the Oil Pressure Gauge
  • Test the gauge by grounding the wire that leads to the sending unit on the block.
  • When the wire is disconnected from the sending unit with the key switch on, the needle on the oil pressure gauge should be either all the way high or all the way low. Grounding the wire should make the needle move to the opposite side of the gauge from where it was before the wire was grounded. If the vehicle is equipped with an oil pressure light, touching the wire to ground and then removing the wire from ground should turn the light on and off.
  • If either happens, the gauge and wiring are good and the sending unit is at fault.
Testing Oil Pressure
Pressure can be tested by temporarily installing an oil pressure gauge in place of the sending unit. Before testing, look up the oil pressure specifications for your vehicle in the appropriate service manual.
  • Bring the engine up to operating temperature.
  • Now shut the engine off.
  • Locate the oil pressure sending unit; usually it is on the lower side of the engine block.
  • Disconnect the wire from the sending unit and use an open ended wrench to remove the sender. Using pliers can damage the unit.
f43-19.jpg An oil pressure sending unit is removed with a special socket. Courtesy of Chrysler Corporation.
  • Tighten the oil pressure test gauge into the hole in the block where the sender was removed.
f11-15_3184.gif Measuring oil pressure. Reprinted with permission.
  • Check the engine's oil level and fill, if required.
WARNING Be extremely careful when working near a running engine. Always wear safety goggles or glasses with side shields when working around moving machinery and be sure that your clothing is not loose.
  • Now turn the engine on and check the oil pressure on the gauge.
    • Watch as the engine warms to note any excessive drops due to temperature.
    • Make sure the engine speed is set to specifications for testing pressure.
    • If necessary, us a tachometer and adjust the engine idle speed.
  • Record the measured oil pressure, then turn off the engine.
  • Compare the test results with the manufacturer's specifications.
    • If the oil pressure is within specifications, this shows that the oil pressure sending unit may not be working correctly.
    • In many cases, replacing the oil sending unit will correct the problem.
  • After the test is complete, reinstall the oil pressure sending unit, start the engine, and confirm there are no leaks.

Nov 20, 2010 | 2002 Pontiac Bonneville

1 Answer

Oil light blinks on and off could pressure switch be bad if so where is it located on a 2000 ford windstar 3.0


Oil Pressure Switch Operation:
00134_oil_pressure_switch_gauge.jpgInformation relay unit for the indicator light or gauge on instrument panel. It contains a diaphragm that responds to changes in oil pressure. When the oil level is over a pre-set limit, the diaphragm opens the switch, turning off the light. When level is below the pre-set limit, the dash light comes on. In later model cars, if the oil pressure drops, the switch turns off the fuel pump, to stop the engine and limit damage to internal parts. Oil pressure switches can be grouped into two categories, units for electrical gauges and for mechanical gauges.

Oil pressure can be checked at the sending unit passage with an externally mounted mechanical oil pressure gauge. To get accurate results from the test, make sure you follow the manufacturer's recommendations and compare your findings to specifications.
Testing the Oil Pressure Gauge
  • Test the gauge by grounding the wire that leads to the sending unit on the block.
  • When the wire is disconnected from the sending unit with the key switch on, the needle on the oil pressure gauge should be either all the way high or all the way low. Grounding the wire should make the needle move to the opposite side of the gauge from where it was before the wire was grounded. If the vehicle is equipped with an oil pressure light, touching the wire to ground and then removing the wire from ground should turn the light on and off.
  • If either happens, the gauge and wiring are good and the sending unit is at fault.
Testing Oil Pressure
Pressure can be tested by temporarily installing an oil pressure gauge in place of the sending unit. Before testing, look up the oil pressure specifications for your vehicle in the appropriate service manual.
  • Bring the engine up to operating temperature.
  • Now shut the engine off.
  • Locate the oil pressure sending unit; usually it is on the lower side of the engine block.
  • Disconnect the wire from the sending unit and use an open ended wrench to remove the sender. Using pliers can damage the unit.
f43-19.jpg An oil pressure sending unit is removed with a special socket. Courtesy of Chrysler Corporation.
  • Tighten the oil pressure test gauge into the hole in the block where the sender was removed.
f11-15_3184.gif Measuring oil pressure. Reprinted with permission.
  • Check the engine's oil level and fill, if required.
WARNING Be extremely careful when working near a running engine. Always wear safety goggles or glasses with side shields when working around moving machinery and be sure that your clothing is not loose.
  • Now turn the engine on and check the oil pressure on the gauge.
    • Watch as the engine warms to note any excessive drops due to temperature.
    • Make sure the engine speed is set to specifications for testing pressure.
    • If necessary, us a tachometer and adjust the engine idle speed.
  • Record the measured oil pressure, then turn off the engine.
  • Compare the test results with the manufacturer's specifications.
    • If the oil pressure is within specifications, this shows that the oil pressure sending unit may not be working correctly.
    • In many cases, replacing the oil sending unit will correct the problem.
  • After the test is complete, reinstall the oil pressure sending unit, start the engine, and confirm there are no leaks.




Nov 17, 2009 | 2000 Ford Windstar

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